diff --git a/src/tests/JIT/BBT/Scenario4/Not-Int32.il b/src/tests/JIT/BBT/Scenario4/Not-Int32.il
index e21d6ab56c5e36..57aeda77878c80 100644
--- a/src/tests/JIT/BBT/Scenario4/Not-Int32.il
+++ b/src/tests/JIT/BBT/Scenario4/Not-Int32.il
@@ -3,6 +3,7 @@
 
 // NOT Int32 Example in IL
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -15,6 +16,9 @@
 {
 .method public static int32  Main()
 {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack  2
 .locals init (int32 ReturnValue)
diff --git a/src/tests/JIT/Directed/Convert/implicitConv.il b/src/tests/JIT/Directed/Convert/implicitConv.il
index c4e810e0cad6ef..4c5f3f08267afd 100644
--- a/src/tests/JIT/Directed/Convert/implicitConv.il
+++ b/src/tests/JIT/Directed/Convert/implicitConv.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly ILGEN_0xc60e022c {}
 .assembly extern mscorlib{auto}
@@ -22,6 +23,9 @@
     ret
 }
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	15
 
diff --git a/src/tests/JIT/Directed/Convert/ldind_conv.il b/src/tests/JIT/Directed/Convert/ldind_conv.il
index 3c19bb3b7c0cdb..d4b74a707c39e0 100644
--- a/src/tests/JIT/Directed/Convert/ldind_conv.il
+++ b/src/tests/JIT/Directed/Convert/ldind_conv.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern mscorlib { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Console { auto }
 .assembly extern System.Runtime { auto }
 
@@ -20,6 +21,9 @@
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack 8
 
diff --git a/src/tests/JIT/Directed/Convert/minopts_convu1.il b/src/tests/JIT/Directed/Convert/minopts_convu1.il
index 324f3e351c269a..38d0371754797a 100644
--- a/src/tests/JIT/Directed/Convert/minopts_convu1.il
+++ b/src/tests/JIT/Directed/Convert/minopts_convu1.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly ILGEN_0xb0847955 {}
 .assembly extern mscorlib{auto}
@@ -24,6 +25,9 @@
 }
 
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	23
 
diff --git a/src/tests/JIT/Directed/Convert/signed_overflow_conversions_are_not_treated_as_unsigned.il b/src/tests/JIT/Directed/Convert/signed_overflow_conversions_are_not_treated_as_unsigned.il
index e79603733bb77d..6036a85b733a19 100644
--- a/src/tests/JIT/Directed/Convert/signed_overflow_conversions_are_not_treated_as_unsigned.il
+++ b/src/tests/JIT/Directed/Convert/signed_overflow_conversions_are_not_treated_as_unsigned.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { auto }
 .assembly SignedOverflowConversionsAreNotTreatedAsUnsigned { }
 
@@ -16,6 +17,9 @@
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init
     (
diff --git a/src/tests/JIT/Directed/ExcepFilters/excepobj/excepobj.il b/src/tests/JIT/Directed/ExcepFilters/excepobj/excepobj.il
index 8e06872edb657e..5a4c2092b7a0b2 100644
--- a/src/tests/JIT/Directed/ExcepFilters/excepobj/excepobj.il
+++ b/src/tests/JIT/Directed/ExcepFilters/excepobj/excepobj.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -18,6 +19,9 @@
   {
     .method public static int32  Main(class [mscorlib]System.String[] args) il managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  2
       .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/ExcepFilters/fault/fault.il b/src/tests/JIT/Directed/ExcepFilters/fault/fault.il
index e53ccef69f3311..f1371d7af894cd 100644
--- a/src/tests/JIT/Directed/ExcepFilters/fault/fault.il
+++ b/src/tests/JIT/Directed/ExcepFilters/fault/fault.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
   {
     .method public static int32  Main(class [mscorlib]System.String[] args) il managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       63 (0x3f)
       .maxstack  3
diff --git a/src/tests/JIT/Directed/ExcepFilters/mixed/mixed.il b/src/tests/JIT/Directed/ExcepFilters/mixed/mixed.il
index c83b5b752a1fe8..80b3317272b99d 100644
--- a/src/tests/JIT/Directed/ExcepFilters/mixed/mixed.il
+++ b/src/tests/JIT/Directed/ExcepFilters/mixed/mixed.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -51,6 +52,9 @@
   {
     .method public static int32  Main(class [mscorlib]System.String[] args) il managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       63 (0x3f)
       .maxstack  3
diff --git a/src/tests/JIT/Directed/ExcepFilters/mixed3/mixed3.il b/src/tests/JIT/Directed/ExcepFilters/mixed3/mixed3.il
index 891fd2997f360f..33c3a76544c417 100644
--- a/src/tests/JIT/Directed/ExcepFilters/mixed3/mixed3.il
+++ b/src/tests/JIT/Directed/ExcepFilters/mixed3/mixed3.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern legacy library mscorlib {}
 .assembly mixed3
@@ -19,6 +20,9 @@
     .field public static int32 exitcode
     .method public static int32  Main(string[] args) il managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  2
 
diff --git a/src/tests/JIT/Directed/FaultHandlers/CallOrder/CallOrder.il b/src/tests/JIT/Directed/FaultHandlers/CallOrder/CallOrder.il
index e38fa0f5eb5423..a22fd8ceb87bbf 100644
--- a/src/tests/JIT/Directed/FaultHandlers/CallOrder/CallOrder.il
+++ b/src/tests/JIT/Directed/FaultHandlers/CallOrder/CallOrder.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -110,6 +111,9 @@
 
 	.method public static int32 Main(class [mscorlib]System.String[]) il managed
 	{
+		.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+		    01 00 00 00
+		)
 		.entrypoint
 		.locals (int32)
 
diff --git a/src/tests/JIT/Directed/FaultHandlers/Nesting/Nesting.il b/src/tests/JIT/Directed/FaultHandlers/Nesting/Nesting.il
index be5735f954c9f0..c0b96691a33cf3 100644
--- a/src/tests/JIT/Directed/FaultHandlers/Nesting/Nesting.il
+++ b/src/tests/JIT/Directed/FaultHandlers/Nesting/Nesting.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -25,6 +26,9 @@
 {
 	.method public static int32 Main(class [mscorlib]System.String[]) il managed
 	{
+		.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+		    01 00 00 00
+		)
 		.entrypoint
   //-------- BEGIN AUTO GENERATED CODE ----------//
 try_0:
diff --git a/src/tests/JIT/Directed/FaultHandlers/Simple/simple.il b/src/tests/JIT/Directed/FaultHandlers/Simple/simple.il
index 26368a9b602823..3b27e041c8be8b 100644
--- a/src/tests/JIT/Directed/FaultHandlers/Simple/simple.il
+++ b/src/tests/JIT/Directed/FaultHandlers/Simple/simple.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -88,6 +89,9 @@
 
 	.method public static int32 Main(class [mscorlib]System.String[]) il managed
 	{
+		.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+		    01 00 00 00
+		)
 		.entrypoint
 		.locals (int32)
 
diff --git a/src/tests/JIT/Directed/IL/Tailcall/ExplicitTailCallNoSO.il b/src/tests/JIT/Directed/IL/Tailcall/ExplicitTailCallNoSO.il
index 203a08bfdfc202..c645cb7b1de126 100644
--- a/src/tests/JIT/Directed/IL/Tailcall/ExplicitTailCallNoSO.il
+++ b/src/tests/JIT/Directed/IL/Tailcall/ExplicitTailCallNoSO.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
   .ver 4:2:1:0
 }
+.assembly extern xunit.core {}
 .assembly ExplicitTailCallNoSO
 {
 }
@@ -15,6 +16,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       44 (0x2c)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/IL/Tailcall/Jittailcall2.il b/src/tests/JIT/Directed/IL/Tailcall/Jittailcall2.il
index e1451dcac22fd0..2249a55d754513 100644
--- a/src/tests/JIT/Directed/IL/Tailcall/Jittailcall2.il
+++ b/src/tests/JIT/Directed/IL/Tailcall/Jittailcall2.il
@@ -5,6 +5,7 @@
 
 .module 'aaa.exe'
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -169,6 +170,9 @@
 
     .method public static int32 Main(class [mscorlib]System.String[] Args) il managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       117 (0x75)
       .maxstack  4
diff --git a/src/tests/JIT/Directed/RVAInit/extended.il b/src/tests/JIT/Directed/RVAInit/extended.il
index cb28ba87da6fc7..ecc018d9be3b17 100644
--- a/src/tests/JIT/Directed/RVAInit/extended.il
+++ b/src/tests/JIT/Directed/RVAInit/extended.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
 }
@@ -122,6 +123,9 @@
     .method private hidebysig static int32
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  2
       .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/RVAInit/gcref1.il b/src/tests/JIT/Directed/RVAInit/gcref1.il
index 37ff4c787ea232..aee3b7e859b406 100644
--- a/src/tests/JIT/Directed/RVAInit/gcref1.il
+++ b/src/tests/JIT/Directed/RVAInit/gcref1.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib
 {
@@ -290,6 +291,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/RVAInit/gcref2.il b/src/tests/JIT/Directed/RVAInit/gcref2.il
index b246d5d1c4961a..5c5d3c2c00ef19 100644
--- a/src/tests/JIT/Directed/RVAInit/gcref2.il
+++ b/src/tests/JIT/Directed/RVAInit/gcref2.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib
 {
@@ -290,6 +291,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/RVAInit/nested.il b/src/tests/JIT/Directed/RVAInit/nested.il
index 18dca62f525cca..c177c47dc5179c 100644
--- a/src/tests/JIT/Directed/RVAInit/nested.il
+++ b/src/tests/JIT/Directed/RVAInit/nested.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib
 {
@@ -231,6 +232,9 @@
 
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/RVAInit/oddsize.il b/src/tests/JIT/Directed/RVAInit/oddsize.il
index de227553e2e8d4..0b2a43a8ebc337 100644
--- a/src/tests/JIT/Directed/RVAInit/oddsize.il
+++ b/src/tests/JIT/Directed/RVAInit/oddsize.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -34,6 +35,9 @@
   }
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/RVAInit/overlap.il b/src/tests/JIT/Directed/RVAInit/overlap.il
index 64d6e86e8cb4c1..5b87cd461cdc30 100644
--- a/src/tests/JIT/Directed/RVAInit/overlap.il
+++ b/src/tests/JIT/Directed/RVAInit/overlap.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
 }
@@ -225,6 +226,9 @@
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/RVAInit/simple.il b/src/tests/JIT/Directed/RVAInit/simple.il
index 3fbd363825dc8a..07d30446ab94e0 100644
--- a/src/tests/JIT/Directed/RVAInit/simple.il
+++ b/src/tests/JIT/Directed/RVAInit/simple.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib { }
 .assembly simple
@@ -215,6 +216,9 @@
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/RVAInit/simplearg.il b/src/tests/JIT/Directed/RVAInit/simplearg.il
index fe01ac88c3144a..b85763c6d801d6 100644
--- a/src/tests/JIT/Directed/RVAInit/simplearg.il
+++ b/src/tests/JIT/Directed/RVAInit/simplearg.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly repro2
 {
   .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -103,6 +104,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       59 (0x3b)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/UnrollLoop/loop3.il b/src/tests/JIT/Directed/UnrollLoop/loop3.il
index 28ebd94cfdccb9..629704fd2c48e6 100644
--- a/src/tests/JIT/Directed/UnrollLoop/loop3.il
+++ b/src/tests/JIT/Directed/UnrollLoop/loop3.il
@@ -3,6 +3,7 @@
 
 //different ways to invoke method inside a loop (no tail. call or jmp/jmpi since they require empty stack)
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -1769,6 +1770,9 @@
 
   .method public hidebysig static int32  Main(string[] args) 
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       1003 (0x3eb)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/array-il/complex3.il b/src/tests/JIT/Directed/array-il/complex3.il
index 91e0dcb18c8877..8d6f45070ece82 100644
--- a/src/tests/JIT/Directed/array-il/complex3.il
+++ b/src/tests/JIT/Directed/array-il/complex3.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern legacy library mscorlib {}
 .assembly complex3
@@ -69,6 +70,9 @@
 
   .method public static int32 Main(string[] args) il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  9
     .locals (int32 SIZE,
diff --git a/src/tests/JIT/Directed/array-il/simple3.il b/src/tests/JIT/Directed/array-il/simple3.il
index 5824f97f7c94e7..7084dbb72c6747 100644
--- a/src/tests/JIT/Directed/array-il/simple3.il
+++ b/src/tests/JIT/Directed/array-il/simple3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -34,6 +35,9 @@
 
   .method public static int32 Main(class [mscorlib]System.String[] args) il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Method begins at RVA 0x1090
     // Code size       230 (0xe6)
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/badldsfld.il b/src/tests/JIT/Directed/coverage/importer/Desktop/badldsfld.il
index 8380763c5dca03..ced1a9eed4a280 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/badldsfld.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/badldsfld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly badldslfd { }
 .class Test_badldsfld extends [mscorlib]System.Object
 {
@@ -13,6 +14,9 @@ ret
 }
 .method public static int32 Main()
 {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .try
 {
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/calli2.il b/src/tests/JIT/Directed/coverage/importer/Desktop/calli2.il
index 7c9c56b229cd47..fdda1a03f372be 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/calli2.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/calli2.il
@@ -1,4 +1,5 @@
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly legacy library calli2 { }
 .class private auto ansi beforefieldinit calli2
        extends [mscorlib]System.Object
@@ -17,6 +18,9 @@
   }
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (int32 V_0,
@@ -43,4 +47,4 @@
 		add
     IL_001e:  ret
   }
-}
\ No newline at end of file
+}
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/ldelemnullarr2.il b/src/tests/JIT/Directed/coverage/importer/Desktop/ldelemnullarr2.il
index 148521201b2aa9..5e5d75a841d5dd 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/ldelemnullarr2.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/ldelemnullarr2.il
@@ -8,6 +8,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 .assembly legacy library ldelemnullarr2 { }
 .class private auto ansi beforefieldinit ldelemnullarr2
@@ -26,6 +27,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 V_0)
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldr4.il b/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldr4.il
index e2b9ac312c7e54..d23b06edd0f378 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldr4.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldr4.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 
 .assembly legacy library ldfldr4 { }
@@ -16,6 +17,9 @@
   .field private initonly static float32 b
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (class Test_ldfldr4 V_0,
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldstatic1.il b/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldstatic1.il
index ce5aabc9e847a4..0fcae53685c333 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldstatic1.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldstatic1.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern legacy library mscorlib {}
 .assembly legacy library ldfldstatic1 { }
@@ -29,6 +30,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (class ldfldstatic1 V_0,
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldunboxedvt.il b/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldunboxedvt.il
index 6ecb74a3eb8333..4fd81c4f78c1fb 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldunboxedvt.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/ldfldunboxedvt.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 .assembly legacy library ldfldunboxedvt { }
 .class public sequential ansi sealed beforefieldinit VT
@@ -32,6 +33,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack 5
     .try
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/nullsdarr.il b/src/tests/JIT/Directed/coverage/importer/Desktop/nullsdarr.il
index a2b2379554a5d5..502523cb02ff6a 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/nullsdarr.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/nullsdarr.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 .assembly legacy library arrlen { }
 .class private auto ansi beforefieldinit nullsdarr
@@ -23,6 +24,9 @@
   }
   .method public static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack 5
     .try
diff --git a/src/tests/JIT/Directed/coverage/importer/Desktop/stfldstatic1.il b/src/tests/JIT/Directed/coverage/importer/Desktop/stfldstatic1.il
index c017191ce009a9..d81771a0ca28dd 100644
--- a/src/tests/JIT/Directed/coverage/importer/Desktop/stfldstatic1.il
+++ b/src/tests/JIT/Directed/coverage/importer/Desktop/stfldstatic1.il
@@ -8,6 +8,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern legacy library mscorlib {}
 .assembly legacy library stfldstatic1 { }
@@ -30,6 +31,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  5
     .locals init (class stfldstatic1 V_0,
diff --git a/src/tests/JIT/Directed/coverage/importer/calli2.il b/src/tests/JIT/Directed/coverage/importer/calli2.il
index 7852f873d82e61..ead260abddfef9 100644
--- a/src/tests/JIT/Directed/coverage/importer/calli2.il
+++ b/src/tests/JIT/Directed/coverage/importer/calli2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -25,6 +26,9 @@
   }
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       31 (0x1f)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/coverage/importer/ldelemnullarr2.il b/src/tests/JIT/Directed/coverage/importer/ldelemnullarr2.il
index 5ceffa99047450..2db8e9d868b435 100644
--- a/src/tests/JIT/Directed/coverage/importer/ldelemnullarr2.il
+++ b/src/tests/JIT/Directed/coverage/importer/ldelemnullarr2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -25,6 +26,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       59 (0x3b)
     .maxstack  1
diff --git a/src/tests/JIT/Directed/coverage/importer/ldfldstatic1.il b/src/tests/JIT/Directed/coverage/importer/ldfldstatic1.il
index aeb4edc559d53d..ce242d362866ee 100644
--- a/src/tests/JIT/Directed/coverage/importer/ldfldstatic1.il
+++ b/src/tests/JIT/Directed/coverage/importer/ldfldstatic1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -28,6 +29,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       23 (0x17)
     .maxstack  1
diff --git a/src/tests/JIT/Directed/coverage/importer/ldfldunboxedvt.il b/src/tests/JIT/Directed/coverage/importer/ldfldunboxedvt.il
index f62d78dfad4d13..316e177d7d32ae 100644
--- a/src/tests/JIT/Directed/coverage/importer/ldfldunboxedvt.il
+++ b/src/tests/JIT/Directed/coverage/importer/ldfldunboxedvt.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -32,6 +33,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack 5
     .try
diff --git a/src/tests/JIT/Directed/coverage/importer/nullsdarr.il b/src/tests/JIT/Directed/coverage/importer/nullsdarr.il
index d8534c7dcaa796..0e0f78b791fa93 100644
--- a/src/tests/JIT/Directed/coverage/importer/nullsdarr.il
+++ b/src/tests/JIT/Directed/coverage/importer/nullsdarr.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -22,6 +23,9 @@
   }
   .method public static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack 5
     .try
diff --git a/src/tests/JIT/Directed/coverage/importer/stfldstatic1.il b/src/tests/JIT/Directed/coverage/importer/stfldstatic1.il
index 988ec1da676f56..6e9d334bfcd0de 100644
--- a/src/tests/JIT/Directed/coverage/importer/stfldstatic1.il
+++ b/src/tests/JIT/Directed/coverage/importer/stfldstatic1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -28,6 +29,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       23 (0x17)
     .maxstack  5
diff --git a/src/tests/JIT/Directed/coverage/oldtests/arrgetlen.il b/src/tests/JIT/Directed/coverage/oldtests/arrgetlen.il
index 180b338653bf23..d7d5bd9630877e 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/arrgetlen.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/arrgetlen.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -36,6 +37,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (class [mscorlib]System.Array V_0,
diff --git a/src/tests/JIT/Directed/coverage/oldtests/ldfldstatic.il b/src/tests/JIT/Directed/coverage/oldtests/ldfldstatic.il
index 8431fd71055e4f..7443055eb2eb0b 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/ldfldstatic.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/ldfldstatic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 .assembly ldflds {}
 .module ldfldstatic.exe
@@ -28,6 +29,9 @@
   
   .method public hidebysig static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals (bool V_0,
diff --git a/src/tests/JIT/Directed/coverage/oldtests/ldsshrstsfld.il b/src/tests/JIT/Directed/coverage/oldtests/ldsshrstsfld.il
index 2a6fac45b4324d..a4748829f24e15 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/ldsshrstsfld.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/ldsshrstsfld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -52,6 +53,9 @@
 
    .method private hidebysig static int32 Main() cil managed
   {
+  	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+  	    01 00 00 00
+  	)
   	.entrypoint
   	call void ldsshrstsfld::f1()
   	call void ldsshrstsfld::f2()
diff --git a/src/tests/JIT/Directed/coverage/oldtests/ldvirtftncalli.il b/src/tests/JIT/Directed/coverage/oldtests/ldvirtftncalli.il
index 874ea9ddaa651e..96b2f342330227 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/ldvirtftncalli.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/ldvirtftncalli.il
@@ -3,6 +3,7 @@
 
 //Testing inliner on a small func that contains ldvirtftn and calli
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -321,6 +322,9 @@
 
   .method public hidebysig static int32 Main() 
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       279 (0x117)
     .maxstack  20
diff --git a/src/tests/JIT/Directed/coverage/oldtests/ovfldiv1.il b/src/tests/JIT/Directed/coverage/oldtests/ovfldiv1.il
index 78b0f88b29e113..14d0bc34d024d8 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/ovfldiv1.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/ovfldiv1.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly ovfldiv1 {}
 .class private auto ansi beforefieldinit ovfldiv1
@@ -13,6 +14,9 @@
 {
   .method private hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  10
 
diff --git a/src/tests/JIT/Directed/coverage/oldtests/ovfldiv2.il b/src/tests/JIT/Directed/coverage/oldtests/ovfldiv2.il
index 4190be400753e9..bece0c12cccec7 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/ovfldiv2.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/ovfldiv2.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -14,6 +15,9 @@
 {
   .method private hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  10
     
diff --git a/src/tests/JIT/Directed/coverage/oldtests/ovflrem1.il b/src/tests/JIT/Directed/coverage/oldtests/ovflrem1.il
index 97dcd589fcfb1a..3e0dd51a637096 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/ovflrem1.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/ovflrem1.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly ovflrem1 {}
 .class private auto ansi beforefieldinit ovflrem1
@@ -13,6 +14,9 @@
 {
   .method private hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  10
 
diff --git a/src/tests/JIT/Directed/coverage/oldtests/ovflrem2.il b/src/tests/JIT/Directed/coverage/oldtests/ovflrem2.il
index d6f48536b31d93..c8ea27b458bcbe 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/ovflrem2.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/ovflrem2.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -14,6 +15,9 @@
 {
   .method private hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  10
     
diff --git a/src/tests/JIT/Directed/coverage/oldtests/stfldstatic1.il b/src/tests/JIT/Directed/coverage/oldtests/stfldstatic1.il
index 59c4332c2a78f6..34c410261ee0ba 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/stfldstatic1.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/stfldstatic1.il
@@ -3,6 +3,7 @@
 
 // stfld on static
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -26,6 +27,9 @@
   .field private int32 a
   .method private hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       196 (0xc4)
     .maxstack  7
diff --git a/src/tests/JIT/Directed/coverage/oldtests/stfldstatic2.il b/src/tests/JIT/Directed/coverage/oldtests/stfldstatic2.il
index 3943591e2f7f8c..b6e1fffc31cb69 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/stfldstatic2.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/stfldstatic2.il
@@ -3,6 +3,7 @@
 
 // volatile. stfld on static field
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -26,6 +27,9 @@
   .field private int32 a
   .method private hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       196 (0xc4)
     .maxstack  7
diff --git a/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly1.il b/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly1.il
index 1cf874edb2b54e..84febf17680c12 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly1.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -13,6 +14,9 @@
 {
   .method private hidebysig static int32 Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       49 (0x31)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly2.il b/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly2.il
index df2042d654f1fa..2fe97a97014523 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly2.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -13,6 +14,9 @@
 {
   .method private hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       49 (0x31)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly3.il b/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly3.il
index 67bb6dc5a199e4..8a03aadc3eca48 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly3.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/switchdefaultonly3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -13,6 +14,9 @@
 {
   .method private hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       49 (0x31)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/coverage/oldtests/tlstest.il b/src/tests/JIT/Directed/coverage/oldtests/tlstest.il
index 7cabc7a33bdab6..b3d705dc85bf3d 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/tlstest.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/tlstest.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib {}
 .assembly extern tls1 {}
@@ -37,6 +38,9 @@
     .method private hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  2
       .locals (uint8& pinned V_0)
diff --git a/src/tests/JIT/Directed/coverage/oldtests/volatilecpobj.il b/src/tests/JIT/Directed/coverage/oldtests/volatilecpobj.il
index 7ab2007b4d18ab..3a2c2de5eaedcd 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/volatilecpobj.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/volatilecpobj.il
@@ -3,6 +3,7 @@
 
 // volatilecpobj.il
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -159,6 +160,9 @@
     .method private hidebysig static int32
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  1
       .locals (int32 V_0)
diff --git a/src/tests/JIT/Directed/coverage/oldtests/zeroinit.il b/src/tests/JIT/Directed/coverage/oldtests/zeroinit.il
index 7be45e74b88426..ac3e75e2cd5df1 100644
--- a/src/tests/JIT/Directed/coverage/oldtests/zeroinit.il
+++ b/src/tests/JIT/Directed/coverage/oldtests/zeroinit.il
@@ -3,6 +3,7 @@
 
 //testing .zeroinit
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -35,6 +36,9 @@
 {
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .zeroinit
     // Code size       569 (0x239)
diff --git a/src/tests/JIT/Directed/forceinlining/AttributeConflict.il b/src/tests/JIT/Directed/forceinlining/AttributeConflict.il
index 5f9ec7098740c5..77d652a488022b 100644
--- a/src/tests/JIT/Directed/forceinlining/AttributeConflict.il
+++ b/src/tests/JIT/Directed/forceinlining/AttributeConflict.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern System.Console
 {
@@ -650,6 +651,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       190 (0xbe)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/forceinlining/NegativeCases.il b/src/tests/JIT/Directed/forceinlining/NegativeCases.il
index 707cd0783d106f..a4e8f8eb264f90 100644
--- a/src/tests/JIT/Directed/forceinlining/NegativeCases.il
+++ b/src/tests/JIT/Directed/forceinlining/NegativeCases.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern System.Console
 {
@@ -67,6 +68,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       71 (0x47)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/forceinlining/PositiveCases.il b/src/tests/JIT/Directed/forceinlining/PositiveCases.il
index 7d74bb1bc13973..02537d0464358f 100644
--- a/src/tests/JIT/Directed/forceinlining/PositiveCases.il
+++ b/src/tests/JIT/Directed/forceinlining/PositiveCases.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern System.Console
 {
@@ -398,6 +399,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       314 (0x13a)
     .maxstack  3
diff --git a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic1.il b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic1.il
index 9633a2c5f6f86d..cfc557b9c23978 100644
--- a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic1.il
+++ b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic1.il
@@ -8,6 +8,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         
@@ -12023,6 +12024,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  8
     IL_0000:  call       bool IntrinsicTest::MainTest()
diff --git a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic2.il b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic2.il
index adae4ef7641d0f..5ef9b79d8bb96f 100644
--- a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic2.il
+++ b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic2.il
@@ -8,6 +8,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         
@@ -12009,6 +12010,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  8
     IL_0000:  call       bool IntrinsicTest::MainTest()
diff --git a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic3.il b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic3.il
index aca149dd826441..3b2209584a3dcb 100644
--- a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic3.il
+++ b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic3.il
@@ -8,6 +8,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         
@@ -1099,6 +1100,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  8
     IL_0000:  call       bool IntrinsicTest::MainTest()
diff --git a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic4.il b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic4.il
index 7b2f5a74b3ea41..7859bb1d04f4b1 100644
--- a/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic4.il
+++ b/src/tests/JIT/Directed/intrinsic/interlocked/rva_rvaStatic4.il
@@ -8,6 +8,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         
@@ -1098,6 +1099,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  8
     IL_0000:  call       bool IntrinsicTest::MainTest()
diff --git a/src/tests/JIT/Directed/leave/catch1.il b/src/tests/JIT/Directed/leave/catch1.il
index f8e365e3ac0180..2219c41298420a 100644
--- a/src/tests/JIT/Directed/leave/catch1.il
+++ b/src/tests/JIT/Directed/leave/catch1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -1226,6 +1227,9 @@ start_try14:
 
   .method public  static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       156 (0x9c)
     .maxstack  20
diff --git a/src/tests/JIT/Directed/leave/catch2.il b/src/tests/JIT/Directed/leave/catch2.il
index 7eb14bcddb0501..bad14490a2a9b3 100644
--- a/src/tests/JIT/Directed/leave/catch2.il
+++ b/src/tests/JIT/Directed/leave/catch2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -1001,6 +1002,9 @@
 
   .method public static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       81 (0x51)
     .maxstack  30
diff --git a/src/tests/JIT/Directed/leave/catch3.il b/src/tests/JIT/Directed/leave/catch3.il
index c74ecd9559f670..fa10779ab8415a 100644
--- a/src/tests/JIT/Directed/leave/catch3.il
+++ b/src/tests/JIT/Directed/leave/catch3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -831,6 +832,9 @@
 
   .method public hidebysig static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       76 (0x4c)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/leave/filter1.il b/src/tests/JIT/Directed/leave/filter1.il
index b49f883cfa5450..19bb70087f82e3 100644
--- a/src/tests/JIT/Directed/leave/filter1.il
+++ b/src/tests/JIT/Directed/leave/filter1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -1641,6 +1642,9 @@
 
   .method public  static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       156 (0x9c)
     .maxstack  20
diff --git a/src/tests/JIT/Directed/leave/filter2.il b/src/tests/JIT/Directed/leave/filter2.il
index 10420a0cee4425..475e505220ad4b 100644
--- a/src/tests/JIT/Directed/leave/filter2.il
+++ b/src/tests/JIT/Directed/leave/filter2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -1213,6 +1214,9 @@
 
   .method public static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       81 (0x51)
     .maxstack  30
diff --git a/src/tests/JIT/Directed/leave/filter3.il b/src/tests/JIT/Directed/leave/filter3.il
index d87a659510cbfa..aa30362476c05f 100644
--- a/src/tests/JIT/Directed/leave/filter3.il
+++ b/src/tests/JIT/Directed/leave/filter3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -1004,6 +1005,9 @@
 
   .method public hidebysig static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       76 (0x4c)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/leave/try1.il b/src/tests/JIT/Directed/leave/try1.il
index 2c5867ca014f72..8fc2879bf00aa6 100644
--- a/src/tests/JIT/Directed/leave/try1.il
+++ b/src/tests/JIT/Directed/leave/try1.il
@@ -4,6 +4,7 @@
 //different datatype in try block
 //
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -1124,6 +1125,9 @@
 
   .method public  static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       156 (0x9c)
     .maxstack  20
diff --git a/src/tests/JIT/Directed/leave/try2.il b/src/tests/JIT/Directed/leave/try2.il
index 4419a23b31a02d..c2906e820189c7 100644
--- a/src/tests/JIT/Directed/leave/try2.il
+++ b/src/tests/JIT/Directed/leave/try2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -890,6 +891,9 @@
 
   .method public static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       81 (0x51)
     .maxstack  30
diff --git a/src/tests/JIT/Directed/leave/try3.il b/src/tests/JIT/Directed/leave/try3.il
index 121947d1b29fac..209c6478163e85 100644
--- a/src/tests/JIT/Directed/leave/try3.il
+++ b/src/tests/JIT/Directed/leave/try3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -613,6 +614,9 @@
 
   .method public static int32 Main() il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       76 (0x4c)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/perffix/primitivevt/callconv3.il b/src/tests/JIT/Directed/perffix/primitivevt/callconv3.il
index d8bc624acefaaf..0ede6779c6b66c 100644
--- a/src/tests/JIT/Directed/perffix/primitivevt/callconv3.il
+++ b/src/tests/JIT/Directed/perffix/primitivevt/callconv3.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern helper {}
 .assembly callconv3 {}
@@ -265,6 +266,9 @@
     .method private hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  6
       .locals init (int32 V_0,
diff --git a/src/tests/JIT/Directed/perffix/primitivevt/identity3.il b/src/tests/JIT/Directed/perffix/primitivevt/identity3.il
index e3b9f024f79a3b..9e9a6c2ac367b0 100644
--- a/src/tests/JIT/Directed/perffix/primitivevt/identity3.il
+++ b/src/tests/JIT/Directed/perffix/primitivevt/identity3.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern nativeinthelper {}
 .assembly identity3 {}
@@ -20,6 +21,9 @@
     .method private hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  5
       .locals (native int V_0,
diff --git a/src/tests/JIT/Directed/pinning/object-pin/Object-Pin.il b/src/tests/JIT/Directed/pinning/object-pin/Object-Pin.il
index b3a54f21cfe1c1..58622d4213227e 100644
--- a/src/tests/JIT/Directed/pinning/object-pin/Object-Pin.il
+++ b/src/tests/JIT/Directed/pinning/object-pin/Object-Pin.il
@@ -4,6 +4,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 .assembly objectpin
 {
@@ -89,6 +90,9 @@ LOOP1:
   .method public static pinvokeimpl("mirror" winapi) void Set_Val(void*,int32 c) il managed preservesig { }
   .method public static int32 Main(class [mscorlib]System.String[] args) il managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  400
     ldstr "Calling Not_Pinned() to assure that GC actually moves things"
diff --git a/src/tests/JIT/Directed/pinvoke/calli_excep.il b/src/tests/JIT/Directed/pinvoke/calli_excep.il
index c6975762c2c1c8..9cb52b3cf30533 100644
--- a/src/tests/JIT/Directed/pinvoke/calli_excep.il
+++ b/src/tests/JIT/Directed/pinvoke/calli_excep.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib { }
 .assembly calli_excep { }
@@ -24,6 +25,9 @@
     .method private hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .custom instance void [mscorlib]System.Runtime.ExceptionServices.HandleProcessCorruptedStateExceptionsAttribute::.ctor() = ( 01 00 00 00 ) 
       .custom instance void [mscorlib]System.Security.SecurityCriticalAttribute::.ctor() = ( 01 00 00 00 ) 
diff --git a/src/tests/JIT/Directed/pinvoke/jump.il b/src/tests/JIT/Directed/pinvoke/jump.il
index 07e505d5cbb6b5..cc5ce795fa8dfc 100644
--- a/src/tests/JIT/Directed/pinvoke/jump.il
+++ b/src/tests/JIT/Directed/pinvoke/jump.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -37,6 +38,9 @@
     .method public hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       83 (0x53)
       .maxstack  3
diff --git a/src/tests/JIT/Directed/pinvoke/preemptive_cooperative.il b/src/tests/JIT/Directed/pinvoke/preemptive_cooperative.il
index 7a23573734afdf..24d2542dff82de 100644
--- a/src/tests/JIT/Directed/pinvoke/preemptive_cooperative.il
+++ b/src/tests/JIT/Directed/pinvoke/preemptive_cooperative.il
@@ -4,6 +4,7 @@
 
 .module extern kernel32.dll
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Threading.Thread { auto }
 .assembly extern mscorlib { auto }
 
@@ -167,6 +168,9 @@
   .method private hidebysig static int32
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  3
     .locals init (class [System.Threading.Thread]System.Threading.Thread V_0,
diff --git a/src/tests/JIT/Directed/pinvoke/sysinfo.il b/src/tests/JIT/Directed/pinvoke/sysinfo.il
index 10e245863cc6e7..a3dd590d18c9fb 100644
--- a/src/tests/JIT/Directed/pinvoke/sysinfo.il
+++ b/src/tests/JIT/Directed/pinvoke/sysinfo.il
@@ -3,6 +3,7 @@
 
 .module extern kernel32
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -32,6 +33,9 @@
     .method public hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       83 (0x53)
       .maxstack  3
diff --git a/src/tests/JIT/Directed/pinvoke/tail.il b/src/tests/JIT/Directed/pinvoke/tail.il
index b3e082a802231d..cd377c77b6b391 100644
--- a/src/tests/JIT/Directed/pinvoke/tail.il
+++ b/src/tests/JIT/Directed/pinvoke/tail.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib { }
 .assembly menus { }
@@ -96,6 +97,9 @@
     .method private hidebysig static int32
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  5
       .locals (native uint V_0,
diff --git a/src/tests/JIT/Directed/rvastatics/RVAOrderingTest.il b/src/tests/JIT/Directed/rvastatics/RVAOrderingTest.il
index 1971e7969af66a..067ce4cc281c76 100644
--- a/src/tests/JIT/Directed/rvastatics/RVAOrderingTest.il
+++ b/src/tests/JIT/Directed/rvastatics/RVAOrderingTest.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime.Extensions { }
 .assembly extern System.Console { }
 .assembly RVAOrderingTest { }
@@ -16,6 +17,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       106 (0x6a)
     .maxstack  2
diff --git a/src/tests/JIT/Directed/rvastatics/rvastatic1.il b/src/tests/JIT/Directed/rvastatics/rvastatic1.il
index 5b08db37aeba9b..32ec484df74f7f 100644
--- a/src/tests/JIT/Directed/rvastatics/rvastatic1.il
+++ b/src/tests/JIT/Directed/rvastatics/rvastatic1.il
@@ -1,4 +1,5 @@
 .assembly extern mscorlib{}
+.assembly extern xunit.core {}
 .assembly rvastatic1{}
 .class public A{
  .method static native int Call1(int64) {.maxstack  50
@@ -7074,6 +7075,9 @@ a010126:
 a010127:
   ret}
  .method static int32 Main(string[] args){.entrypoint .maxstack  5
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   call void [rvastatic1]A::V1()
   call void [rvastatic1]A::V2()
   call void [rvastatic1]A::V3()
diff --git a/src/tests/JIT/Directed/rvastatics/rvastatic2.il b/src/tests/JIT/Directed/rvastatics/rvastatic2.il
index 08538a6f91d082..323589685773bd 100644
--- a/src/tests/JIT/Directed/rvastatics/rvastatic2.il
+++ b/src/tests/JIT/Directed/rvastatics/rvastatic2.il
@@ -1,4 +1,5 @@
 .assembly extern mscorlib{}
+.assembly extern xunit.core {}
 .assembly rvastatic2{}
 .class public A{
  .method static native int Call1(int64) {.maxstack  50
@@ -7087,6 +7088,9 @@ a010126:
 a010127:
   ret}
  .method static int32 Main(string[] args){.entrypoint .maxstack  5
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   call void [rvastatic2]A::V1()
   call void [rvastatic2]A::V2()
   call void [rvastatic2]A::V3()
diff --git a/src/tests/JIT/Directed/rvastatics/rvastatic3.il b/src/tests/JIT/Directed/rvastatics/rvastatic3.il
index 2ce179ad271ba0..9feb1889c137f6 100644
--- a/src/tests/JIT/Directed/rvastatics/rvastatic3.il
+++ b/src/tests/JIT/Directed/rvastatics/rvastatic3.il
@@ -1,4 +1,5 @@
 .assembly extern mscorlib{}
+.assembly extern xunit.core {}
 .assembly rvastatic3{}
 .class public A{
  .method static native int Call1(int64) {.maxstack  50
@@ -7089,6 +7090,9 @@ a010126:
 a010127:
   ret}
  .method static int32 Main(string[] args){.entrypoint .maxstack  5
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   call void [rvastatic3]A::V1()
   call void [rvastatic3]A::V2()
   call void [rvastatic3]A::V3()
diff --git a/src/tests/JIT/Directed/rvastatics/rvastatic4.il b/src/tests/JIT/Directed/rvastatics/rvastatic4.il
index 7ace1b6ee5d184..bc4b7ccedc9c30 100644
--- a/src/tests/JIT/Directed/rvastatics/rvastatic4.il
+++ b/src/tests/JIT/Directed/rvastatics/rvastatic4.il
@@ -1,4 +1,5 @@
 .assembly extern mscorlib{}
+.assembly extern xunit.core {}
 .assembly rvastatic4{}
 .class public A{
  .method static native int Call1(int64) {.maxstack  50
@@ -7082,6 +7083,9 @@ a010126:
 a010127:
   ret}
  .method static int32 Main(string[] args){.entrypoint .maxstack  5
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   call void [rvastatic4]A::V1()
   call void [rvastatic4]A::V2()
   call void [rvastatic4]A::V3()
diff --git a/src/tests/JIT/Directed/rvastatics/rvastatic5.il b/src/tests/JIT/Directed/rvastatics/rvastatic5.il
index 2ac6a7c244e19e..e9490132678128 100644
--- a/src/tests/JIT/Directed/rvastatics/rvastatic5.il
+++ b/src/tests/JIT/Directed/rvastatics/rvastatic5.il
@@ -1,4 +1,5 @@
 .assembly extern mscorlib{}
+.assembly extern xunit.core {}
 .assembly rvastatic5{}
 .class public A{
  .method static native int Call1(int64) {.maxstack  50
@@ -7066,6 +7067,9 @@ a010126:
 a010127:
   ret}
  .method static int32 Main(string[] args){.entrypoint .maxstack  5
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   call void [rvastatic5]A::V1()
   call void [rvastatic5]A::V2()
   call void [rvastatic5]A::V3()
diff --git a/src/tests/JIT/Directed/shift/int8.il b/src/tests/JIT/Directed/shift/int8.il
index 7a5db06b02ab0a..913ab2dc5ba6d7 100644
--- a/src/tests/JIT/Directed/shift/int8.il
+++ b/src/tests/JIT/Directed/shift/int8.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -135,6 +136,9 @@
     .method public hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       839 (0x347)
       .maxstack  4
diff --git a/src/tests/JIT/Directed/shift/nativeint.il b/src/tests/JIT/Directed/shift/nativeint.il
index 389637e2a3cd29..4b1e84a8ffa4b8 100644
--- a/src/tests/JIT/Directed/shift/nativeint.il
+++ b/src/tests/JIT/Directed/shift/nativeint.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -135,6 +136,9 @@
     .method public hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       839 (0x347)
       .maxstack  4
diff --git a/src/tests/JIT/Directed/shift/nativeuint.il b/src/tests/JIT/Directed/shift/nativeuint.il
index b98274053bb788..f2aecf73a64fbf 100644
--- a/src/tests/JIT/Directed/shift/nativeuint.il
+++ b/src/tests/JIT/Directed/shift/nativeuint.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -135,6 +136,9 @@
     .method public hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       839 (0x347)
       .maxstack  4
diff --git a/src/tests/JIT/Directed/tailcall/more_tailcalls.il b/src/tests/JIT/Directed/tailcall/more_tailcalls.il
index 84be13bab3cbda..3dae96347c7d93 100644
--- a/src/tests/JIT/Directed/tailcall/more_tailcalls.il
+++ b/src/tests/JIT/Directed/tailcall/more_tailcalls.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
   .ver 5:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
@@ -949,6 +950,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       1835 (0x72b)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/tailcall/tailcall.il b/src/tests/JIT/Directed/tailcall/tailcall.il
index f94c43ebae1c04..0a0cec99a0b31a 100644
--- a/src/tests/JIT/Directed/tailcall/tailcall.il
+++ b/src/tests/JIT/Directed/tailcall/tailcall.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime.Extensions { auto }
 .assembly extern mscorlib { auto }
 
@@ -254,6 +255,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  3
     .locals init (class Class1 V_0,
diff --git a/src/tests/JIT/Directed/throwbox/fault.il b/src/tests/JIT/Directed/throwbox/fault.il
index 81f398dad72202..6973caff7ce614 100644
--- a/src/tests/JIT/Directed/throwbox/fault.il
+++ b/src/tests/JIT/Directed/throwbox/fault.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
     .method private hidebysig static int32
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       115 (0x73)
       .maxstack  2
diff --git a/src/tests/JIT/Directed/throwbox/filter.il b/src/tests/JIT/Directed/throwbox/filter.il
index e277706ffb3afc..e9b737e4c0be71 100644
--- a/src/tests/JIT/Directed/throwbox/filter.il
+++ b/src/tests/JIT/Directed/throwbox/filter.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
     .method private hidebysig static int32
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       120 (0x78)
       .maxstack  2
diff --git a/src/tests/JIT/Directed/throwbox/finally.il b/src/tests/JIT/Directed/throwbox/finally.il
index 6822a205c2edd9..93698e1b4a0ea1 100644
--- a/src/tests/JIT/Directed/throwbox/finally.il
+++ b/src/tests/JIT/Directed/throwbox/finally.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
     .method private hidebysig static int32
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       115 (0x73)
       .maxstack  2
diff --git a/src/tests/JIT/Directed/throwbox/rethrow.il b/src/tests/JIT/Directed/throwbox/rethrow.il
index f45ba04b4da915..35ae886c50e784 100644
--- a/src/tests/JIT/Directed/throwbox/rethrow.il
+++ b/src/tests/JIT/Directed/throwbox/rethrow.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
     .method private hidebysig static int32
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       // Code size       120 (0x78)
       .maxstack  2
diff --git a/src/tests/JIT/Directed/zeroinit/Dev10_863995.il b/src/tests/JIT/Directed/zeroinit/Dev10_863995.il
index bb169c8e0dc835..27cde55a025e0e 100644
--- a/src/tests/JIT/Directed/zeroinit/Dev10_863995.il
+++ b/src/tests/JIT/Directed/zeroinit/Dev10_863995.il
@@ -5,6 +5,7 @@
 
 // Metadata version: v4.0.21104
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -85,6 +86,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // 
     .maxstack  17
diff --git a/src/tests/JIT/Directed/zeroinit/init_byte.il b/src/tests/JIT/Directed/zeroinit/init_byte.il
index 23d6e4efab31fe..2a721820b2b5d5 100644
--- a/src/tests/JIT/Directed/zeroinit/init_byte.il
+++ b/src/tests/JIT/Directed/zeroinit/init_byte.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -430,6 +431,9 @@
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       709 (0x2c5)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/zeroinit/init_int32.il b/src/tests/JIT/Directed/zeroinit/init_int32.il
index a30dbc8a71ace2..f9be1f5c637a3b 100644
--- a/src/tests/JIT/Directed/zeroinit/init_int32.il
+++ b/src/tests/JIT/Directed/zeroinit/init_int32.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -417,6 +418,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       709 (0x2c5)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/zeroinit/init_int64.il b/src/tests/JIT/Directed/zeroinit/init_int64.il
index 5f931b40c832a8..124e01d68373d1 100644
--- a/src/tests/JIT/Directed/zeroinit/init_int64.il
+++ b/src/tests/JIT/Directed/zeroinit/init_int64.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -430,6 +431,9 @@
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       709 (0x2c5)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/zeroinit/init_struct.il b/src/tests/JIT/Directed/zeroinit/init_struct.il
index bce5a1e560c9a5..da55918580a8b2 100644
--- a/src/tests/JIT/Directed/zeroinit/init_struct.il
+++ b/src/tests/JIT/Directed/zeroinit/init_struct.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -477,6 +478,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       740 (0x2e4)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/zeroinit/init_uint32.il b/src/tests/JIT/Directed/zeroinit/init_uint32.il
index 52a1cee97587e8..4fb204c4af0e40 100644
--- a/src/tests/JIT/Directed/zeroinit/init_uint32.il
+++ b/src/tests/JIT/Directed/zeroinit/init_uint32.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -417,6 +418,9 @@
   .method private hidebysig static unsigned int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       709 (0x2c5)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/zeroinit/init_uint64.il b/src/tests/JIT/Directed/zeroinit/init_uint64.il
index 679bd19fce706f..c3b2e2a9f75409 100644
--- a/src/tests/JIT/Directed/zeroinit/init_uint64.il
+++ b/src/tests/JIT/Directed/zeroinit/init_uint64.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -430,6 +431,9 @@
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       709 (0x2c5)
     .maxstack  4
diff --git a/src/tests/JIT/Directed/zeroinit/tail.il b/src/tests/JIT/Directed/zeroinit/tail.il
index 6c430155ea47c7..df7547e6a43571 100644
--- a/src/tests/JIT/Directed/zeroinit/tail.il
+++ b/src/tests/JIT/Directed/zeroinit/tail.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -66,6 +67,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       81 (0x51)
     .maxstack  2
diff --git a/src/tests/JIT/Generics/ConstrainedCall/class1.il b/src/tests/JIT/Generics/ConstrainedCall/class1.il
index 044b77c628cba5..35ce0a76762dca 100644
--- a/src/tests/JIT/Generics/ConstrainedCall/class1.il
+++ b/src/tests/JIT/Generics/ConstrainedCall/class1.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly class1 {}
 .class interface private abstract auto ansi IncrDecr
@@ -245,6 +246,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  3
     .locals init (class MyCounter<class MyInt> V_0,
diff --git a/src/tests/JIT/Generics/ConstrainedCall/class2.il b/src/tests/JIT/Generics/ConstrainedCall/class2.il
index e16cec3d8b41a5..fea004ef58a016 100644
--- a/src/tests/JIT/Generics/ConstrainedCall/class2.il
+++ b/src/tests/JIT/Generics/ConstrainedCall/class2.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly class2 {}
 .class interface private abstract auto ansi IncrDecr
@@ -310,6 +311,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  3
     .locals init (class MyCounter<class MyInt> V_0,
diff --git a/src/tests/JIT/Generics/ConstrainedCall/vt1.il b/src/tests/JIT/Generics/ConstrainedCall/vt1.il
index 9a6060de979593..b5802835364047 100644
--- a/src/tests/JIT/Generics/ConstrainedCall/vt1.il
+++ b/src/tests/JIT/Generics/ConstrainedCall/vt1.il
@@ -6,6 +6,7 @@
 // Increment: constrained, Decrement: box
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -232,6 +233,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       361 (0x169)
     .maxstack  3
diff --git a/src/tests/JIT/Generics/ConstrainedCall/vt2.il b/src/tests/JIT/Generics/ConstrainedCall/vt2.il
index 5c6d293d8bb018..f537653f1d7c13 100644
--- a/src/tests/JIT/Generics/ConstrainedCall/vt2.il
+++ b/src/tests/JIT/Generics/ConstrainedCall/vt2.il
@@ -6,6 +6,7 @@
 // Val*A: constrained, Val*B: box
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -184,6 +185,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       218 (0xda)
     .maxstack  4
diff --git a/src/tests/JIT/Generics/ConstrainedCall/vt3.il b/src/tests/JIT/Generics/ConstrainedCall/vt3.il
index 61eaec9638209b..007f1f17ba45c1 100644
--- a/src/tests/JIT/Generics/ConstrainedCall/vt3.il
+++ b/src/tests/JIT/Generics/ConstrainedCall/vt3.il
@@ -6,6 +6,7 @@
 // Val*A: constrained, Val*B: box
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -201,6 +202,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       218 (0xda)
     .maxstack  4
diff --git a/src/tests/JIT/Generics/ConstrainedCall/vt4.il b/src/tests/JIT/Generics/ConstrainedCall/vt4.il
index d78179c8cd08fb..73b5be192103f4 100644
--- a/src/tests/JIT/Generics/ConstrainedCall/vt4.il
+++ b/src/tests/JIT/Generics/ConstrainedCall/vt4.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly vt4 {}
 .class interface private abstract auto ansi IncrDecr
@@ -300,6 +301,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  3
     .locals init (class MyCounter<valuetype MyInt> V_0,
diff --git a/src/tests/JIT/Generics/regression/DDB148379/ddb148379.il b/src/tests/JIT/Generics/regression/DDB148379/ddb148379.il
index 1258de5130d59d..daadbbeba9b145 100644
--- a/src/tests/JIT/Generics/regression/DDB148379/ddb148379.il
+++ b/src/tests/JIT/Generics/regression/DDB148379/ddb148379.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -115,6 +116,9 @@
 {
   .method private hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       35 (0x23)
     .maxstack  8
diff --git a/src/tests/JIT/IL_Conformance/Old/Conformance_Base/conv_ovf_i1_un.il b/src/tests/JIT/IL_Conformance/Old/Conformance_Base/conv_ovf_i1_un.il
index 140817efd7b0df..b6eab5cdcc11fa 100644
--- a/src/tests/JIT/IL_Conformance/Old/Conformance_Base/conv_ovf_i1_un.il
+++ b/src/tests/JIT/IL_Conformance/Old/Conformance_Base/conv_ovf_i1_un.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 //Constant Prop phase was not checking for overflow when propagating through a conv.ovf.
 //Correct behavior expects the code within the try block to throw an exception.
@@ -15,6 +16,9 @@
 .assembly extern mscorlib{auto}
 .class Class_test {
     .method static int32 Main() {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack	5
 
diff --git a/src/tests/JIT/Intrinsics/TypeIntrinsics_il.il b/src/tests/JIT/Intrinsics/TypeIntrinsics_il.il
index a55a9b84d67e63..5d467fdf116c08 100644
--- a/src/tests/JIT/Intrinsics/TypeIntrinsics_il.il
+++ b/src/tests/JIT/Intrinsics/TypeIntrinsics_il.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { auto }
 
 .assembly TypeIntrinsicsTests { }
@@ -11,6 +12,9 @@
 {
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     // it's not currently possible to produce `ldtoken [type]&` in C#
diff --git a/src/tests/JIT/jit64/eh/basics/throwisfirstinstruction.il b/src/tests/JIT/jit64/eh/basics/throwisfirstinstruction.il
index 7f1bb7eefea194..e1138aa44e7737 100644
--- a/src/tests/JIT/jit64/eh/basics/throwisfirstinstruction.il
+++ b/src/tests/JIT/jit64/eh/basics/throwisfirstinstruction.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern common {}
 .assembly test {}
@@ -38,6 +39,9 @@
 
   .method public static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
       ldsfld     class [common]TestUtil.TestLog test::testLog
diff --git a/src/tests/JIT/jit64/localloc/call/call05_dynamic.il b/src/tests/JIT/jit64/localloc/call/call05_dynamic.il
index 38c4596b9de3a6..c255270b2bddfb 100644
--- a/src/tests/JIT/jit64/localloc/call/call05_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/call/call05_dynamic.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly call05{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  11
     .locals (int32* intArray1,
diff --git a/src/tests/JIT/jit64/localloc/call/call05_large.il b/src/tests/JIT/jit64/localloc/call/call05_large.il
index cafc142b08294f..19fc4e65c39460 100644
--- a/src/tests/JIT/jit64/localloc/call/call05_large.il
+++ b/src/tests/JIT/jit64/localloc/call/call05_large.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly call05{}
@@ -16,6 +17,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  11
     .locals (int32* intArray1,
diff --git a/src/tests/JIT/jit64/localloc/call/call05_small.il b/src/tests/JIT/jit64/localloc/call/call05_small.il
index a1b211c6bf98dd..d80856db385dff 100644
--- a/src/tests/JIT/jit64/localloc/call/call05_small.il
+++ b/src/tests/JIT/jit64/localloc/call/call05_small.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly call05{}
@@ -16,6 +17,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  11
     .locals (int32* intArray1,
diff --git a/src/tests/JIT/jit64/localloc/call/call07_dynamic.il b/src/tests/JIT/jit64/localloc/call/call07_dynamic.il
index 32fb99b3095e74..1d7f16f1b2e0bd 100644
--- a/src/tests/JIT/jit64/localloc/call/call07_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/call/call07_dynamic.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly call07{}
@@ -15,6 +16,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  10
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/call/call07_small.il b/src/tests/JIT/jit64/localloc/call/call07_small.il
index e1ea33e1ebcdaf..b7d5ab5223ac0b 100644
--- a/src/tests/JIT/jit64/localloc/call/call07_small.il
+++ b/src/tests/JIT/jit64/localloc/call/call07_small.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly call07{}
@@ -15,6 +16,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  10
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/eh/eh03_dynamic.il b/src/tests/JIT/jit64/localloc/eh/eh03_dynamic.il
index 64eeefaeb4953b..9daa299698651f 100644
--- a/src/tests/JIT/jit64/localloc/eh/eh03_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/eh/eh03_dynamic.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common {}
 .assembly eh03{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/eh/eh03_large.il b/src/tests/JIT/jit64/localloc/eh/eh03_large.il
index e364873e3a64d7..773951577a4b3f 100644
--- a/src/tests/JIT/jit64/localloc/eh/eh03_large.il
+++ b/src/tests/JIT/jit64/localloc/eh/eh03_large.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common {}
 .assembly eh03{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/eh/eh03_small.il b/src/tests/JIT/jit64/localloc/eh/eh03_small.il
index 2c3b05ce65ed7b..150e3d0cc47f23 100644
--- a/src/tests/JIT/jit64/localloc/eh/eh03_small.il
+++ b/src/tests/JIT/jit64/localloc/eh/eh03_small.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common {}
 .assembly eh03{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/eh/eh04_dynamic.il b/src/tests/JIT/jit64/localloc/eh/eh04_dynamic.il
index 30e47e430ae67f..f2b0f8456477f7 100644
--- a/src/tests/JIT/jit64/localloc/eh/eh04_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/eh/eh04_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh03{}
@@ -16,6 +17,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/eh/eh04_large.il b/src/tests/JIT/jit64/localloc/eh/eh04_large.il
index cf96d23ff93036..584f4db66bd77a 100644
--- a/src/tests/JIT/jit64/localloc/eh/eh04_large.il
+++ b/src/tests/JIT/jit64/localloc/eh/eh04_large.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh03{}
@@ -16,6 +17,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/eh/eh04_small.il b/src/tests/JIT/jit64/localloc/eh/eh04_small.il
index 4330db5744a9fd..d33598b21742cd 100644
--- a/src/tests/JIT/jit64/localloc/eh/eh04_small.il
+++ b/src/tests/JIT/jit64/localloc/eh/eh04_small.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh03{}
@@ -16,6 +17,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh05_dynamic.il b/src/tests/JIT/jit64/localloc/ehverify/eh05_dynamic.il
index 115a60494c1114..0db6ea3f45ec91 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh05_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh05_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -41,6 +42,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh05_large.il b/src/tests/JIT/jit64/localloc/ehverify/eh05_large.il
index 23df4797f384c2..b0daafa3cfe59c 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh05_large.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh05_large.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh05{}
@@ -39,6 +40,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh05_small.il b/src/tests/JIT/jit64/localloc/ehverify/eh05_small.il
index 390fff924a363d..01aa29f90b4ae4 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh05_small.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh05_small.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh05{}
@@ -39,6 +40,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh06_dynamic.il b/src/tests/JIT/jit64/localloc/ehverify/eh06_dynamic.il
index 23735c62e5cafd..548edf5d40d8d7 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh06_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh06_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -37,6 +38,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh06_large.il b/src/tests/JIT/jit64/localloc/ehverify/eh06_large.il
index c84af2e9037f7f..e8194f277a15c7 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh06_large.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh06_large.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh05{}
@@ -35,6 +36,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh06_small.il b/src/tests/JIT/jit64/localloc/ehverify/eh06_small.il
index b90b2154355d4c..cf0f2cef6a18e8 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh06_small.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh06_small.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh05{}
@@ -35,6 +36,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh07_dynamic.il b/src/tests/JIT/jit64/localloc/ehverify/eh07_dynamic.il
index dcc12ae5defc47..ab15798ce21821 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh07_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh07_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -43,6 +44,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh07_large.il b/src/tests/JIT/jit64/localloc/ehverify/eh07_large.il
index 86a280556d702b..b097e5614c3ec7 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh07_large.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh07_large.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -44,6 +45,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh07_small.il b/src/tests/JIT/jit64/localloc/ehverify/eh07_small.il
index 8328bc557025ea..0bde1fd0678138 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh07_small.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh07_small.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -41,6 +42,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh08_dynamic.il b/src/tests/JIT/jit64/localloc/ehverify/eh08_dynamic.il
index fb1ecc253384e5..c323b96db2c77e 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh08_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh08_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -37,6 +38,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh08_large.il b/src/tests/JIT/jit64/localloc/ehverify/eh08_large.il
index 3c2635bd7acadf..9cc01277ab1028 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh08_large.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh08_large.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh05{}
@@ -35,6 +36,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh08_small.il b/src/tests/JIT/jit64/localloc/ehverify/eh08_small.il
index 45f41c522f981e..6113ead2f81a10 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh08_small.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh08_small.il
@@ -5,6 +5,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly eh05{}
@@ -33,6 +34,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init (int32 retValue)
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh11_dynamic.il b/src/tests/JIT/jit64/localloc/ehverify/eh11_dynamic.il
index 645e4969cae650..4d7729de437701 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh11_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh11_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh11_large.il b/src/tests/JIT/jit64/localloc/ehverify/eh11_large.il
index feb82d8be82ead..18bb06752a6209 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh11_large.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh11_large.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh11_small.il b/src/tests/JIT/jit64/localloc/ehverify/eh11_small.il
index eff30b3b2753d3..678910f046d3e1 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh11_small.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh11_small.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (bool testPassed,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh12_dynamic.il b/src/tests/JIT/jit64/localloc/ehverify/eh12_dynamic.il
index 8f5549cffb555a..b29c0441d4ca41 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh12_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh12_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh12_large.il b/src/tests/JIT/jit64/localloc/ehverify/eh12_large.il
index a98db00f65d8cb..5ae5fb2063b805 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh12_large.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh12_large.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh12_small.il b/src/tests/JIT/jit64/localloc/ehverify/eh12_small.il
index 6b6d00f8da9a3d..acc726908f3073 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh12_small.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh12_small.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh13_dynamic.il b/src/tests/JIT/jit64/localloc/ehverify/eh13_dynamic.il
index f8260c940990f5..756daf24e0ece1 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh13_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh13_dynamic.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh13_large.il b/src/tests/JIT/jit64/localloc/ehverify/eh13_large.il
index 99dd8739184c66..290193803c0308 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh13_large.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh13_large.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/ehverify/eh13_small.il b/src/tests/JIT/jit64/localloc/ehverify/eh13_small.il
index 79ae7d73d7695b..907ede2426bbcb 100644
--- a/src/tests/JIT/jit64/localloc/ehverify/eh13_small.il
+++ b/src/tests/JIT/jit64/localloc/ehverify/eh13_small.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib{}
 .assembly extern common{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind04_dynamic.il b/src/tests/JIT/jit64/localloc/unwind/unwind04_dynamic.il
index 48c8bd3c7e01e0..3e047e2dac9256 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind04_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind04_dynamic.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind03{}
@@ -18,6 +19,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind04_large.il b/src/tests/JIT/jit64/localloc/unwind/unwind04_large.il
index 23ca1d74a13c04..26073ea6ed7ebe 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind04_large.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind04_large.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind03{}
@@ -18,6 +19,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind04_small.il b/src/tests/JIT/jit64/localloc/unwind/unwind04_small.il
index e5a72db87ca24f..8b11d9fa022db9 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind04_small.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind04_small.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind03{}
@@ -18,6 +19,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind05_dynamic.il b/src/tests/JIT/jit64/localloc/unwind/unwind05_dynamic.il
index 9bd3316bf4cff2..138491cc7b8bc0 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind05_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind05_dynamic.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind02{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind05_large.il b/src/tests/JIT/jit64/localloc/unwind/unwind05_large.il
index f009b320e9e623..a05b4931b595f1 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind05_large.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind05_large.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind02{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind05_small.il b/src/tests/JIT/jit64/localloc/unwind/unwind05_small.il
index 55f372d900f48f..f261372fe8be9c 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind05_small.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind05_small.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind02{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind06_dynamic.il b/src/tests/JIT/jit64/localloc/unwind/unwind06_dynamic.il
index a1641586ba1c53..039e0032f761af 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind06_dynamic.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind06_dynamic.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind06{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind06_large.il b/src/tests/JIT/jit64/localloc/unwind/unwind06_large.il
index 57c9a928823100..a9957832b14b33 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind06_large.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind06_large.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind06{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/unwind/unwind06_small.il b/src/tests/JIT/jit64/localloc/unwind/unwind06_small.il
index 4f60eec33af7c7..8597aea7abd658 100644
--- a/src/tests/JIT/jit64/localloc/unwind/unwind06_small.il
+++ b/src/tests/JIT/jit64/localloc/unwind/unwind06_small.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly extern common{}
 .assembly unwind06{}
@@ -17,6 +18,9 @@
   .field private static int32 locallocSize
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals (unsigned int64 local1,
diff --git a/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_large.il b/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_large.il
index 67bee9ca9cb1c3..7254f9b8c2c894 100644
--- a/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_large.il
+++ b/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_large.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 // Test zero initialization of localloc
 .assembly extern mscorlib{}
@@ -17,6 +18,9 @@
   .field public static int32 size_to_test
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       79 (0x4f)
     .maxstack  3
diff --git a/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_small.il b/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_small.il
index 34666e7a5c7532..c39c8f76c846e6 100644
--- a/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_small.il
+++ b/src/tests/JIT/jit64/localloc/zeroinit/zeroinit01_small.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 // Test zero initialization of localloc
 .assembly extern mscorlib{}
@@ -17,6 +18,9 @@
   .field public static int32 size_to_test
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       79 (0x4f)
     .maxstack  3
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i00.il b/src/tests/JIT/jit64/mcc/interop/mcc_i00.il
index e0a27e55eb78c3..56f2c9574cb290 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i00.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i00.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i01.il b/src/tests/JIT/jit64/mcc/interop/mcc_i01.il
index 921c619ceb21bd..47c1ed5fd8409c 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i01.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i01.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i02.il b/src/tests/JIT/jit64/mcc/interop/mcc_i02.il
index ef223ed4515fc8..54a186aa924f42 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i02.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i02.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -61,6 +62,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i03.il b/src/tests/JIT/jit64/mcc/interop/mcc_i03.il
index 9382602ad77cc5..5caa0c42870fd3 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i03.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i03.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -65,6 +66,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i04.il b/src/tests/JIT/jit64/mcc/interop/mcc_i04.il
index 65caa0193f4ef7..b7b8b693b2c8dc 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i04.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i04.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i05.il b/src/tests/JIT/jit64/mcc/interop/mcc_i05.il
index f9432a1d66ec59..fddce8de2564aa 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i05.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i05.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i06.il b/src/tests/JIT/jit64/mcc/interop/mcc_i06.il
index 11b397f0ea1d62..4b359f32a15a9d 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i06.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i06.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -58,6 +59,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i07.il b/src/tests/JIT/jit64/mcc/interop/mcc_i07.il
index ecdc9f046868b1..98501e02310366 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i07.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i07.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -62,6 +63,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i10.il b/src/tests/JIT/jit64/mcc/interop/mcc_i10.il
index 12a0bef9c0386a..9219f22ac0adfc 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i10.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i10.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly MCCTest {}
 .module mcc_i10.exe
 
@@ -17,6 +18,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i11.il b/src/tests/JIT/jit64/mcc/interop/mcc_i11.il
index 87642efb5d99a9..80ed3d431d7f79 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i11.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i11.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i12.il b/src/tests/JIT/jit64/mcc/interop/mcc_i12.il
index 11cbffaf97ac6f..550bff4f503353 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i12.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i12.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -61,6 +62,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i13.il b/src/tests/JIT/jit64/mcc/interop/mcc_i13.il
index 77c0b622b14113..5e28b3306892ab 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i13.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i13.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -65,6 +66,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i14.il b/src/tests/JIT/jit64/mcc/interop/mcc_i14.il
index 674bcc18d93cac..ae7d29a82b0105 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i14.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i14.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i15.il b/src/tests/JIT/jit64/mcc/interop/mcc_i15.il
index 92ea974f7c4815..f3e35badc39909 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i15.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i15.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i16.il b/src/tests/JIT/jit64/mcc/interop/mcc_i16.il
index 60a2cc21d91f73..c2c04dc29ad9f9 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i16.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i16.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -58,6 +59,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i17.il b/src/tests/JIT/jit64/mcc/interop/mcc_i17.il
index 6cf8c9dad6ab4a..edf636f268f2b8 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i17.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i17.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -62,6 +63,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i30.il b/src/tests/JIT/jit64/mcc/interop/mcc_i30.il
index eabf8c3d705fdc..94d0739ef0df1a 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i30.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i30.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i31.il b/src/tests/JIT/jit64/mcc/interop/mcc_i31.il
index b1a5b86d3e27e9..7c5e5d08fb1078 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i31.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i31.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i32.il b/src/tests/JIT/jit64/mcc/interop/mcc_i32.il
index d55fe1b7f97604..d5a90ff50c6769 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i32.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i32.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -107,6 +108,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i33.il b/src/tests/JIT/jit64/mcc/interop/mcc_i33.il
index 7058532bd4014d..90667335c2a086 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i33.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i33.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -111,6 +112,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i34.il b/src/tests/JIT/jit64/mcc/interop/mcc_i34.il
index 02805a92afb94e..abe748c37b526f 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i34.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i34.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i35.il b/src/tests/JIT/jit64/mcc/interop/mcc_i35.il
index f9c3fb533eccbd..ba985fe5b41961 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i35.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i35.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i36.il b/src/tests/JIT/jit64/mcc/interop/mcc_i36.il
index 5f668dd84a7017..f753508e53fea2 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i36.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i36.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -116,6 +117,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i37.il b/src/tests/JIT/jit64/mcc/interop/mcc_i37.il
index 9ff6a1579f3436..11ab5b8fd62511 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i37.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i37.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -126,6 +127,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i50.il b/src/tests/JIT/jit64/mcc/interop/mcc_i50.il
index 0d8f010aadf8bd..f01fb0d63aaea2 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i50.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i50.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i51.il b/src/tests/JIT/jit64/mcc/interop/mcc_i51.il
index bf201f65909618..ff557cc1a3c438 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i51.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i51.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i52.il b/src/tests/JIT/jit64/mcc/interop/mcc_i52.il
index c7ccca96f64268..6c7306a081ce75 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i52.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i52.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -107,6 +108,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i53.il b/src/tests/JIT/jit64/mcc/interop/mcc_i53.il
index e35dd531e19ff3..f6ff300b292b7c 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i53.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i53.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -111,6 +112,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i54.il b/src/tests/JIT/jit64/mcc/interop/mcc_i54.il
index bde19ac5ecd8ee..081e6481c164ee 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i54.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i54.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i55.il b/src/tests/JIT/jit64/mcc/interop/mcc_i55.il
index 7b17fbee4c719c..9c0fc7b17c0290 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i55.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i55.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i56.il b/src/tests/JIT/jit64/mcc/interop/mcc_i56.il
index b6db97b0f1d227..33d8208ec46da9 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i56.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i56.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -116,6 +117,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i57.il b/src/tests/JIT/jit64/mcc/interop/mcc_i57.il
index d6db39a9197589..7ff97612180228 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i57.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i57.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -126,6 +127,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i60.il b/src/tests/JIT/jit64/mcc/interop/mcc_i60.il
index bc662df3ecb239..e16791d0663b96 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i60.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i60.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i61.il b/src/tests/JIT/jit64/mcc/interop/mcc_i61.il
index a3ebd09f1c70d8..132edc42205ae2 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i61.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i61.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i62.il b/src/tests/JIT/jit64/mcc/interop/mcc_i62.il
index 9dbb6e429310d6..221b383a29600d 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i62.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i62.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -107,6 +108,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i63.il b/src/tests/JIT/jit64/mcc/interop/mcc_i63.il
index 91700af7a57446..9142d8ad03093a 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i63.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i63.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -111,6 +112,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i64.il b/src/tests/JIT/jit64/mcc/interop/mcc_i64.il
index fe0dc2a85e414f..5d7bf057cc147e 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i64.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i64.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i65.il b/src/tests/JIT/jit64/mcc/interop/mcc_i65.il
index c04fc1cfdf5b5f..9c6af51be7baa8 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i65.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i65.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i66.il b/src/tests/JIT/jit64/mcc/interop/mcc_i66.il
index 9a98de2f517348..2f51c689ac1bdb 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i66.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i66.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -116,6 +117,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i67.il b/src/tests/JIT/jit64/mcc/interop/mcc_i67.il
index d700c19dbe5c3e..f557eef41a3e62 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i67.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i67.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -126,6 +127,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i70.il b/src/tests/JIT/jit64/mcc/interop/mcc_i70.il
index 0e60e3483861c3..75c7bc6b25089a 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i70.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i70.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i71.il b/src/tests/JIT/jit64/mcc/interop/mcc_i71.il
index 2e9eb03cbeb9e9..9ed1e4f3c624a8 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i71.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i71.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i72.il b/src/tests/JIT/jit64/mcc/interop/mcc_i72.il
index 28d4774152c6ef..183103b44d7477 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i72.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i72.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -107,6 +108,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i73.il b/src/tests/JIT/jit64/mcc/interop/mcc_i73.il
index 1131f1f4df1d8c..6c644c0d78a0ac 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i73.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i73.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -111,6 +112,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i74.il b/src/tests/JIT/jit64/mcc/interop/mcc_i74.il
index 5a8f5363174224..01e18527134b1e 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i74.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i74.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i75.il b/src/tests/JIT/jit64/mcc/interop/mcc_i75.il
index 2ee425d8f2c5c6..66aebab7c884ec 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i75.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i75.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i76.il b/src/tests/JIT/jit64/mcc/interop/mcc_i76.il
index d27c0f208dc4ba..59eb8539e6410d 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i76.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i76.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -116,6 +117,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i77.il b/src/tests/JIT/jit64/mcc/interop/mcc_i77.il
index afe7eb2ba23dc5..59dde5add424c3 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i77.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i77.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -126,6 +127,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i80.il b/src/tests/JIT/jit64/mcc/interop/mcc_i80.il
index bb5868ebd3b3ca..96ed924f92587a 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i80.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i80.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i81.il b/src/tests/JIT/jit64/mcc/interop/mcc_i81.il
index e7bc913529e4a8..907fca6e9f2340 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i81.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i81.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -19,6 +20,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i82.il b/src/tests/JIT/jit64/mcc/interop/mcc_i82.il
index f454801170759a..c48d71f0c9b629 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i82.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i82.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -107,6 +108,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i83.il b/src/tests/JIT/jit64/mcc/interop/mcc_i83.il
index d859410e3c10bf..f2e194ad3729ae 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i83.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i83.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -111,6 +112,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i84.il b/src/tests/JIT/jit64/mcc/interop/mcc_i84.il
index ef769dd8f8c30e..2883eb41d8d365 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i84.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i84.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i85.il b/src/tests/JIT/jit64/mcc/interop/mcc_i85.il
index 0a75eaf66cdb2d..39e997a6a45130 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i85.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i85.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -22,6 +23,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i86.il b/src/tests/JIT/jit64/mcc/interop/mcc_i86.il
index efdd7a13ab1ad0..a243df62541b16 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i86.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i86.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -116,6 +117,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/mcc/interop/mcc_i87.il b/src/tests/JIT/jit64/mcc/interop/mcc_i87.il
index 9d900cd54063e8..65ee210f372231 100644
--- a/src/tests/JIT/jit64/mcc/interop/mcc_i87.il
+++ b/src/tests/JIT/jit64/mcc/interop/mcc_i87.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Runtime.Extensions { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 .assembly MCCTest {}
@@ -126,6 +127,9 @@
 
     .method private static int32 Main(string[] args)
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  64
       .locals init	(
diff --git a/src/tests/JIT/jit64/opt/cprop/Dev10_844071.il b/src/tests/JIT/jit64/opt/cprop/Dev10_844071.il
index a95f03141c6fa0..20af1f1f859cd8 100644
--- a/src/tests/JIT/jit64/opt/cprop/Dev10_844071.il
+++ b/src/tests/JIT/jit64/opt/cprop/Dev10_844071.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v4.0.21218
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -359,6 +360,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       60 (0x3c)
     .maxstack  2
diff --git a/src/tests/JIT/jit64/opt/cprop/Dev10_884217_IL.il b/src/tests/JIT/jit64/opt/cprop/Dev10_884217_IL.il
index 09d2e59a8a7484..ca3330df74d8c6 100644
--- a/src/tests/JIT/jit64/opt/cprop/Dev10_884217_IL.il
+++ b/src/tests/JIT/jit64/opt/cprop/Dev10_884217_IL.il
@@ -6,6 +6,7 @@
  
 // Metadata version: v4.0.20926
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -59,6 +60,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       81 (0x51)
     .maxstack  3
diff --git a/src/tests/JIT/jit64/opt/cprop/cprop002.il b/src/tests/JIT/jit64/opt/cprop/cprop002.il
index ade9ae6b20ccd1..b045feb17a0a36 100644
--- a/src/tests/JIT/jit64/opt/cprop/cprop002.il
+++ b/src/tests/JIT/jit64/opt/cprop/cprop002.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -15,6 +16,9 @@
   .field public static bool b
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals (uint32 V_0, int32 V_1)
 
diff --git a/src/tests/JIT/jit64/opt/inl/inl001.il b/src/tests/JIT/jit64/opt/inl/inl001.il
index 39eb40de0b2610..d1803a13f50489 100644
--- a/src/tests/JIT/jit64/opt/inl/inl001.il
+++ b/src/tests/JIT/jit64/opt/inl/inl001.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -32,6 +33,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       45 (0x2d)
     .maxstack  2
diff --git a/src/tests/JIT/jit64/opt/lim/lim_001.il b/src/tests/JIT/jit64/opt/lim/lim_001.il
index c845ebdc2a7f21..407392937dd214 100644
--- a/src/tests/JIT/jit64/opt/lim/lim_001.il
+++ b/src/tests/JIT/jit64/opt/lim/lim_001.il
@@ -6,6 +6,7 @@
 
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -20,6 +21,9 @@
 .field public static int32 k
   .method public static int32 Main() cil managed
   {
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.locals init (int32, int32, int32)
     .entrypoint
 
diff --git a/src/tests/JIT/jit64/opt/osr/osr015.il b/src/tests/JIT/jit64/opt/osr/osr015.il
index 80c4a5de77386c..4e1af6f51f702d 100644
--- a/src/tests/JIT/jit64/opt/osr/osr015.il
+++ b/src/tests/JIT/jit64/opt/osr/osr015.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
 
   .method public static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (int32)
 	
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/bne.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/bne.il
index 34a9ff73725abe..e0f4f9edd135a0 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/bne.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/bne.il
@@ -6,11 +6,15 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly cprop_test {}
 .assembly extern mscorlib{auto}
 .class cprop_test {
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	5
 
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/conv.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/conv.il
index fcb440d49fad0b..33b10b5992c338 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/conv.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/conv.il
@@ -6,11 +6,15 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly Class_test {}
 .assembly extern mscorlib{auto}
 .class Class_test {
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	5
 
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/div.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/div.il
index a6b1587b0a75fb..9e51374e893eac 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/div.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/div.il
@@ -6,11 +6,15 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly cprop_test {}
 .assembly extern mscorlib{auto}
 .class cprop_test {
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	5
      ldc.i4.7
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul1.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul1.il
index 29ac8deeefae1d..787916f41abc8d 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul1.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul1.il
@@ -6,11 +6,15 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly cprop_test {}
 .assembly extern mscorlib{auto}
 .class cprop_test {
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	5
 
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul_exception.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul_exception.il
index f313e6b6def0da..cf8ff91c20f221 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul_exception.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/mul_exception.il
@@ -6,11 +6,15 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly cprop_test {}
 .assembly extern mscorlib{auto}
 .class cprop_test {
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	5
 
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/rem.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/rem.il
index 42ed64983a4d71..e58708b364829c 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/rem.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/223862/rem.il
@@ -6,11 +6,15 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly cprop_test {}
 .assembly extern mscorlib{auto}
 .class cprop_test {
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	5
      ldc.i4.7
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/228572/conv.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/228572/conv.il
index 58bb0ee1d406ab..7d6b190ab49963 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/228572/conv.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/228572/conv.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly Conv_test {}
 .assembly extern mscorlib{auto}
@@ -38,6 +39,9 @@ IL_01:
  ret
 }
 .method static int32 Main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	5
     .try
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo.il
index 8ad4d10b2ef342..6aa0207cc28298 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo.il
@@ -10,6 +10,7 @@
 {
   .ver 2:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly foo
 {
 }
@@ -47,6 +48,9 @@
 
   .method privatescope static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  20
 
diff --git a/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo2.il b/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo2.il
index fabd511f95bd6d..21fdb04053d639 100644
--- a/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo2.il
+++ b/src/tests/JIT/jit64/opt/regress/vswhidbey/481244/foo2.il
@@ -10,6 +10,7 @@
 {
   .ver 2:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly foo
 {
 }
@@ -46,6 +47,9 @@
 
   .method privatescope static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  20
 
diff --git a/src/tests/JIT/jit64/regress/ddb/118414/118414.il b/src/tests/JIT/jit64/regress/ddb/118414/118414.il
index 73d82352a6f74a..f9c767841ec186 100644
--- a/src/tests/JIT/jit64/regress/ddb/118414/118414.il
+++ b/src/tests/JIT/jit64/regress/ddb/118414/118414.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly ILGEN_0x3243f637 {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib{auto}
 
 .class ILGEN_0x3243f637 {
@@ -38,6 +39,9 @@ Loop_0x0:
     }
 
     .method static int32 Main() {
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         .maxstack	5
 
diff --git a/src/tests/JIT/jit64/regress/phoenix/62322/test.il b/src/tests/JIT/jit64/regress/phoenix/62322/test.il
index 7d29c494b89db7..c18a6476343890 100644
--- a/src/tests/JIT/jit64/regress/phoenix/62322/test.il
+++ b/src/tests/JIT/jit64/regress/phoenix/62322/test.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -78,6 +79,9 @@
 {
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       51 (0x33)
     .maxstack  2
diff --git a/src/tests/JIT/jit64/regress/vsw/102754/test1.il b/src/tests/JIT/jit64/regress/vsw/102754/test1.il
index d91fc2a533fc18..37a0c94fc389e9 100644
--- a/src/tests/JIT/jit64/regress/vsw/102754/test1.il
+++ b/src/tests/JIT/jit64/regress/vsw/102754/test1.il
@@ -11,6 +11,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib
 {
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         
@@ -43,6 +44,9 @@
     .method public hidebysig static int32 
             Main() cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  2
       .locals (int64* V_0,
diff --git a/src/tests/JIT/jit64/regress/vsw/102974/test.il b/src/tests/JIT/jit64/regress/vsw/102974/test.il
index f50deea4142a71..ee7b9f9ab2ab0d 100644
--- a/src/tests/JIT/jit64/regress/vsw/102974/test.il
+++ b/src/tests/JIT/jit64/regress/vsw/102974/test.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 // This test was failing due to a bug that existed when we were first bringing up GC on amd64.  Probably won't fail
 // anytime soon, but a good case to have.
@@ -73,6 +74,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     .locals init (class Test/Dummy V_0)
diff --git a/src/tests/JIT/jit64/regress/vsw/266693/test.il b/src/tests/JIT/jit64/regress/vsw/266693/test.il
index 8eed7229bcc0b0..d82de8d6dfd4b3 100644
--- a/src/tests/JIT/jit64/regress/vsw/266693/test.il
+++ b/src/tests/JIT/jit64/regress/vsw/266693/test.il
@@ -5,6 +5,7 @@
 // when we are prevented from inlining something.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -70,6 +71,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class Test_test V_0)
     ldc.i4 10
diff --git a/src/tests/JIT/jit64/regress/vsw/333007/test1.il b/src/tests/JIT/jit64/regress/vsw/333007/test1.il
index 96da675912bac3..4b3949f6106acc 100644
--- a/src/tests/JIT/jit64/regress/vsw/333007/test1.il
+++ b/src/tests/JIT/jit64/regress/vsw/333007/test1.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -46,6 +47,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       22 (0x16)
     .maxstack  8
diff --git a/src/tests/JIT/jit64/regress/vsw/373472/test.il b/src/tests/JIT/jit64/regress/vsw/373472/test.il
index addb7e948e9850..73f538ab6a85d6 100644
--- a/src/tests/JIT/jit64/regress/vsw/373472/test.il
+++ b/src/tests/JIT/jit64/regress/vsw/373472/test.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -41,6 +42,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       40 (0x28)
     .maxstack  2
diff --git a/src/tests/JIT/jit64/regress/vsw/404708/test.il b/src/tests/JIT/jit64/regress/vsw/404708/test.il
index fc150cc3f1d446..009c093c3077ea 100644
--- a/src/tests/JIT/jit64/regress/vsw/404708/test.il
+++ b/src/tests/JIT/jit64/regress/vsw/404708/test.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -49,6 +50,9 @@
 
     .method public hidebysig static int32 Main(string[] args) cil managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  1
 
diff --git a/src/tests/JIT/jit64/regress/vsw/460412/test.il b/src/tests/JIT/jit64/regress/vsw/460412/test.il
index 89e38697280711..1f535fe81f3eed 100644
--- a/src/tests/JIT/jit64/regress/vsw/460412/test.il
+++ b/src/tests/JIT/jit64/regress/vsw/460412/test.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -71,6 +72,9 @@ starg 0
 {
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       87 (0x57)
     .maxstack  2
diff --git a/src/tests/JIT/jit64/regress/vsw/543645/test.il b/src/tests/JIT/jit64/regress/vsw/543645/test.il
index c438b898641e2c..61da8f6d3a19c7 100644
--- a/src/tests/JIT/jit64/regress/vsw/543645/test.il
+++ b/src/tests/JIT/jit64/regress/vsw/543645/test.il
@@ -10,6 +10,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
   .ver 0:0:0:0
@@ -33,6 +34,9 @@
   .method private hidebysig static int32
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (int32 r)
 
diff --git a/src/tests/JIT/jit64/regress/vsw/552940/test.il b/src/tests/JIT/jit64/regress/vsw/552940/test.il
index b3e3584b50a12d..cbc03a5a194c22 100644
--- a/src/tests/JIT/jit64/regress/vsw/552940/test.il
+++ b/src/tests/JIT/jit64/regress/vsw/552940/test.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern common {}
 .assembly test {}
@@ -77,6 +78,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (int32 V_0)
diff --git a/src/tests/JIT/jit64/regress/vsw/606733/Bug606733.il b/src/tests/JIT/jit64/regress/vsw/606733/Bug606733.il
index 26fbefcec54fbc..4a5cc028bec6ff 100644
--- a/src/tests/JIT/jit64/regress/vsw/606733/Bug606733.il
+++ b/src/tests/JIT/jit64/regress/vsw/606733/Bug606733.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -49,6 +50,9 @@
 
 .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       54 (0x36)
     .maxstack  2
diff --git a/src/tests/JIT/jit64/regress/vsw/607586/607586.il b/src/tests/JIT/jit64/regress/vsw/607586/607586.il
index 779dd789063342..3a67a9fabb813c 100644
--- a/src/tests/JIT/jit64/regress/vsw/607586/607586.il
+++ b/src/tests/JIT/jit64/regress/vsw/607586/607586.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib
 {
@@ -31,6 +32,9 @@
 {
     .method private hidebysig static int32 Main() cil managed
     {
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         .maxstack  5
         .locals init ([0] int32 CS$1$0000)
diff --git a/src/tests/JIT/jit64/verif/sniff/fg/ver_fg_13.il b/src/tests/JIT/jit64/verif/sniff/fg/ver_fg_13.il
index 179f34b37e5938..55f3996f2c7dce 100644
--- a/src/tests/JIT/jit64/verif/sniff/fg/ver_fg_13.il
+++ b/src/tests/JIT/jit64/verif/sniff/fg/ver_fg_13.il
@@ -5,6 +5,7 @@
 // expect throw System.InvalidProgramException
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -19,6 +20,9 @@
 {
   .method public static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (int32 retval)	
 	.try
diff --git a/src/tests/JIT/opt/AssertionPropagation/CPropOverflow.il b/src/tests/JIT/opt/AssertionPropagation/CPropOverflow.il
index d166431728dec1..ba3efe43d4b5e6 100644
--- a/src/tests/JIT/opt/AssertionPropagation/CPropOverflow.il
+++ b/src/tests/JIT/opt/AssertionPropagation/CPropOverflow.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -66,6 +67,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       103 (0x67)
     .maxstack  2
diff --git a/src/tests/JIT/opt/Devirtualization/GenericArrayOverride.il b/src/tests/JIT/opt/Devirtualization/GenericArrayOverride.il
index 7349f2e5b7b977..27374f568a1256 100644
--- a/src/tests/JIT/opt/Devirtualization/GenericArrayOverride.il
+++ b/src/tests/JIT/opt/Devirtualization/GenericArrayOverride.il
@@ -9,6 +9,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
   .ver 5:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern System.Collections
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
@@ -209,6 +210,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       120 (0x78)
     .maxstack  5
diff --git a/src/tests/JIT/opt/Devirtualization/GitHub_9945_2.il b/src/tests/JIT/opt/Devirtualization/GitHub_9945_2.il
index e90b30b7d05fca..816d776f9558ec 100644
--- a/src/tests/JIT/opt/Devirtualization/GitHub_9945_2.il
+++ b/src/tests/JIT/opt/Devirtualization/GitHub_9945_2.il
@@ -4,6 +4,7 @@
 .assembly extern mscorlib
 {
 }
+.assembly extern xunit.core {}
 
 .assembly GitHub_9945_2
 {
@@ -36,6 +37,9 @@
 {
   .method public hidebysig static  int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .locals (object)
     .entrypoint
     // Store ref in supertyped local to "forget" type
diff --git a/src/tests/JIT/opt/Devirtualization/override.il b/src/tests/JIT/opt/Devirtualization/override.il
index 830d03d55d9c67..3046144bbc99de 100644
--- a/src/tests/JIT/opt/Devirtualization/override.il
+++ b/src/tests/JIT/opt/Devirtualization/override.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // MyBar is an abstract class which declares an abstract method MyBar::DoBar().
 // MyBar also DoSelfBar() that explicitly overrides DoBar().
 // BarImpl extends MyBar and also overrides DoBar().
@@ -84,6 +85,9 @@
 {
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       66 (0x42)
     .maxstack  2
diff --git a/src/tests/JIT/opt/DumpDisasm/JitMinOpts/BBCnt1.il b/src/tests/JIT/opt/DumpDisasm/JitMinOpts/BBCnt1.il
index 36a8f1120b17f2..36adec8a81ca5a 100644
--- a/src/tests/JIT/opt/DumpDisasm/JitMinOpts/BBCnt1.il
+++ b/src/tests/JIT/opt/DumpDisasm/JitMinOpts/BBCnt1.il
@@ -5,6 +5,7 @@
 // New Basic Block BB2001 created.
 // OPTIONS: opts.MinOpts() == true
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       11955 (0x2eb3)
     .maxstack  3
diff --git a/src/tests/JIT/opt/DumpDisasm/JitMinOpts/CodeSize1.il b/src/tests/JIT/opt/DumpDisasm/JitMinOpts/CodeSize1.il
index 8e85028ef6b6d6..62d2f492b5cc1d 100644
--- a/src/tests/JIT/opt/DumpDisasm/JitMinOpts/CodeSize1.il
+++ b/src/tests/JIT/opt/DumpDisasm/JitMinOpts/CodeSize1.il
@@ -5,6 +5,7 @@
 // Code size       60001 (0xea61)
 // OPTIONS: opts.MinOpts() == true
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint 
     .maxstack  3
     .locals init (int32 V_0,
diff --git a/src/tests/JIT/opt/DumpDisasm/JitMinOpts/InstrCnt1.il b/src/tests/JIT/opt/DumpDisasm/JitMinOpts/InstrCnt1.il
index f8b1420e74d5cc..da075a15f17c5c 100644
--- a/src/tests/JIT/opt/DumpDisasm/JitMinOpts/InstrCnt1.il
+++ b/src/tests/JIT/opt/DumpDisasm/JitMinOpts/InstrCnt1.il
@@ -4,6 +4,7 @@
 // DEFAULT_MIN_OPTS_INSTR_COUNT  20000
 // OPTIONS: opts.MinOpts() == true
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -15,6 +16,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  4
     .locals init (class [mscorlib]System.Random V_0,
diff --git a/src/tests/JIT/opt/ETW/TailCallCases.il b/src/tests/JIT/opt/ETW/TailCallCases.il
index d2d0be85599d70..75d743e39568ef 100644
--- a/src/tests/JIT/opt/ETW/TailCallCases.il
+++ b/src/tests/JIT/opt/ETW/TailCallCases.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 
 
@@ -225,6 +226,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       103 (0x67)
     .maxstack  4
diff --git a/src/tests/JIT/opt/Inline/regression/badcallee/badcallee.il b/src/tests/JIT/opt/Inline/regression/badcallee/badcallee.il
index 869f2bab4b1720..774ac55c179732 100644
--- a/src/tests/JIT/opt/Inline/regression/badcallee/badcallee.il
+++ b/src/tests/JIT/opt/Inline/regression/badcallee/badcallee.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 
 .assembly extern System.Console
 {
@@ -34,6 +35,9 @@
 
   .method public hidebysig static int32  Main(string[] x) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     ldarg.0
     ldlen
diff --git a/src/tests/JIT/opt/Inline/regression/mismatch32/mismatch32.il b/src/tests/JIT/opt/Inline/regression/mismatch32/mismatch32.il
index 9cc64c3d37e943..72e58775c13d28 100644
--- a/src/tests/JIT/opt/Inline/regression/mismatch32/mismatch32.il
+++ b/src/tests/JIT/opt/Inline/regression/mismatch32/mismatch32.il
@@ -8,6 +8,7 @@
 //
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console {}
 .assembly extern System.Runtime {}
 .assembly main {}
@@ -41,6 +42,9 @@
 
 .method public hidebysig static int32 Main(string[] args) cil managed
 {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .locals init (int32 v_0)
       // Code size       28 (0x1c)
diff --git a/src/tests/JIT/opt/Inline/regression/mismatch64/mismatch64.il b/src/tests/JIT/opt/Inline/regression/mismatch64/mismatch64.il
index 53b2c0e7b8ae99..61dc0efff146da 100644
--- a/src/tests/JIT/opt/Inline/regression/mismatch64/mismatch64.il
+++ b/src/tests/JIT/opt/Inline/regression/mismatch64/mismatch64.il
@@ -8,6 +8,7 @@
 //
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console {}
 .assembly extern System.Runtime {}
 .assembly main {}
@@ -41,6 +42,9 @@
 
 .method public hidebysig static int32 Main(string[] args) cil managed
 {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .locals init (int32 v_0)
       // Code size       28 (0x1c)
diff --git a/src/tests/JIT/opt/Inline/tests/calli.il b/src/tests/JIT/opt/Inline/tests/calli.il
index c239f4658d8902..97e94ceecd0e38 100644
--- a/src/tests/JIT/opt/Inline/tests/calli.il
+++ b/src/tests/JIT/opt/Inline/tests/calli.il
@@ -4,6 +4,7 @@
 // Test that inliner can now inline g1 and g2
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 
 .assembly legacy library calli_inline {}
 .class private auto ansi beforefieldinit calli_test
@@ -35,6 +36,9 @@
   }
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     call int32 calli_test::g1()
diff --git a/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt0.il b/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt0.il
index 6967e7c8297f36..36c6b8b5f3bf91 100644
--- a/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt0.il
+++ b/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt0.il
@@ -5,6 +5,7 @@
 // New Basic Block BB2000 created.
 // OPTIONS: opts.MinOpts() == false
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       11955 (0x2eb3)
     .maxstack  3
diff --git a/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt1.il b/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt1.il
index a4ed1fe406198c..63b387f60a3e7f 100644
--- a/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt1.il
+++ b/src/tests/JIT/opt/JitMinOpts/Perf/BBCnt1.il
@@ -5,6 +5,7 @@
 // New Basic Block BB2001 created.
 // OPTIONS: opts.MinOpts() == true
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -16,6 +17,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       11955 (0x2eb3)
     .maxstack  3
diff --git a/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize0.il b/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize0.il
index 6c3aee6151cd03..b5dd58657a8ae7 100644
--- a/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize0.il
+++ b/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize0.il
@@ -6,6 +6,7 @@
 // TID 934: IL Code Size,Instr 59998,15513, Basic Block count 722, Local Variable Num,Ref count  17,5326 for method CodeSize0.Main():int
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -18,6 +19,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       59998 (0xea5e)
     .maxstack  3
diff --git a/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize1.il b/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize1.il
index bb08f13a878f57..1b53ce5a160881 100644
--- a/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize1.il
+++ b/src/tests/JIT/opt/JitMinOpts/Perf/CodeSize1.il
@@ -7,6 +7,7 @@
 // TID abc: IL Code Size,Instr 60002,15515, Basic Block count 722, Local Variable Num,Ref count  17,5328 for method CodeSize1.Main():int
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -19,6 +20,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       60003 (0xea63)
     .maxstack  3
diff --git a/src/tests/JIT/opt/Tailcall/TailcallVerifyWithPrefix.il b/src/tests/JIT/opt/Tailcall/TailcallVerifyWithPrefix.il
index 2aa7e723559b4f..db6e6a4c30252d 100644
--- a/src/tests/JIT/opt/Tailcall/TailcallVerifyWithPrefix.il
+++ b/src/tests/JIT/opt/Tailcall/TailcallVerifyWithPrefix.il
@@ -8,6 +8,7 @@
 .module extern libc
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -2253,6 +2254,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
 
diff --git a/src/tests/Loader/classloader/Casting/castclasspointer.il b/src/tests/Loader/classloader/Casting/castclasspointer.il
index ccbdd132ce45f4..484edd480ff181 100644
--- a/src/tests/Loader/classloader/Casting/castclasspointer.il
+++ b/src/tests/Loader/classloader/Casting/castclasspointer.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly castclasspointer { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { }
 
 .class value MyGen`1<T>
@@ -43,6 +44,9 @@ OK:
 
 .method public static int32 Main()
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   ldnull
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2.il
index 75bf58c9b68ad8..4fc29cc28189c4 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly constrained2 { }
 
 .class interface private abstract auto ansi IAdder`1<T>
@@ -82,6 +83,9 @@
 
 .method public hidebysig static int32 Main()
 {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     .locals init (
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2_gm.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2_gm.il
index 21f224e954a77e..ae609ae15397ae 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2_gm.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained2_gm.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly constrained2_gm { }
 
 .class interface private abstract auto ansi IAdder`1<T>
@@ -82,6 +83,9 @@
 
 .method public hidebysig static int32 Main()
 {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     .locals init (
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3.il
index 50f0b6fa8a79c4..a21660740efcf2 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly constrained3 { }
 
 .class interface private abstract auto ansi IFrobber`1<T>
@@ -46,6 +47,9 @@
 
 .method public hidebysig static int32 Main()
 {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     .locals init (
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3_gm.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3_gm.il
index 70b3084873eb1b..1ca2bf93a74157 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3_gm.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrained3_gm.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly constrained3_gm { }
 
 .class interface private abstract auto ansi IFrobber`1<T>
@@ -46,6 +47,9 @@
 
 .method public hidebysig static int32 Main()
 {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     .locals init (
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrainedcall.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrainedcall.il
index c8388043d372e5..319e6afdf08174 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrainedcall.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/constrainedcall/constrainedcall.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly constrainedcall { }
 
 .class interface private abstract auto ansi IAdder`1<T>
@@ -78,6 +79,9 @@
 
 .method public hidebysig static int32 Main()
 {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     .locals init (
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/diamondshape/diamondshape.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/diamondshape/diamondshape.il
index a96ad865be6f14..24ee8bb3a5e897 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/diamondshape/diamondshape.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/diamondshape/diamondshape.il
@@ -12,6 +12,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 // TODO: use the contract once this is exposed from contracts
 .assembly extern System.Runtime { }
 
@@ -833,6 +834,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       23 (0x17)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/genericmethods/genericmethods.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/genericmethods/genericmethods.il
index 599829d973e140..78b571b1647902 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/genericmethods/genericmethods.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/genericmethods/genericmethods.il
@@ -12,6 +12,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly genericmethods
 {
   .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -165,6 +166,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       223 (0xdf)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/methodimpl/methodimpl.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/methodimpl/methodimpl.il
index f3ead578ecab11..d54b5be16e9586 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/methodimpl/methodimpl.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/methodimpl/methodimpl.il
@@ -12,6 +12,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly methodimpl
 {
   .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -955,6 +956,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       23 (0x17)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/reabstraction/reabstraction.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/reabstraction/reabstraction.il
index 7cb6747f206fb8..55b6ea4775b237 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/reabstraction/reabstraction.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/reabstraction/reabstraction.il
@@ -3,6 +3,7 @@
 //
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 
 .assembly reabstraction { }
@@ -139,6 +140,9 @@
 
 .method private hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   .try
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/non_virtual_calls_to_instance_methods.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/non_virtual_calls_to_instance_methods.il
index 7faea8d7c5185a..5883ab07cac3cf 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/non_virtual_calls_to_instance_methods.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/non_virtual_calls_to_instance_methods.il
@@ -11,6 +11,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
   .ver 4:2:1:0
 }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
@@ -111,6 +112,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       56 (0x38)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/sharedgenerics.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/sharedgenerics.il
index 2671ed5a6a7db8..a23a4d1618e043 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/sharedgenerics.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/sharedgenerics/sharedgenerics.il
@@ -12,6 +12,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly sharedgenerics
 {
   .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -121,6 +122,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       126 (0x7e)
     .maxstack  5
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/simple/simple.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/simple/simple.il
index 85d64dbbc377fb..c36bf3c8559384 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/simple/simple.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/simple/simple.il
@@ -12,6 +12,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly simple
 {
   .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -224,6 +225,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       158 (0x9e)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/DefaultInterfaceMethods/valuetypes/valuetypes.il b/src/tests/Loader/classloader/DefaultInterfaceMethods/valuetypes/valuetypes.il
index ff51b0ab33f79d..40c1daaea4d263 100644
--- a/src/tests/Loader/classloader/DefaultInterfaceMethods/valuetypes/valuetypes.il
+++ b/src/tests/Loader/classloader/DefaultInterfaceMethods/valuetypes/valuetypes.il
@@ -12,6 +12,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly valuetypes
 {
   .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -116,6 +117,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (valuetype FooBarStruct V_0,
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Ambiguous.il b/src/tests/Loader/classloader/InterfaceFolding/Ambiguous.il
index 1e732480211e48..9bf4939ac54017 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Ambiguous.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Ambiguous.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50727.4926
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -126,6 +127,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       96 (0x60)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase0.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase0.il
index f7ba311903f7e0..f11ff9f80e68a8 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase0.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase0.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase0 {}
 
 
@@ -80,6 +81,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase1.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase1.il
index a52403639b0abd..e3c5a6ceca6283 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase1.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase1 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase2.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase2.il
index c2026d19c500e6..c226ef5cd564a3 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase2.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase2 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase3.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase3.il
index b30e09d848156f..d8d8005618feb4 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase3.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase3 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase4.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase4.il
index bf27c6544d701a..3aaa5848a0e579 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase4.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase4.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase4 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase5.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase5.il
index 3b0903c3dd81e9..993fe9f2ad3678 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase5.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase5.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase5 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase6.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase6.il
index 28353f88abc2ad..e0ce563ddcc720 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase6.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I/TestCase6.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase6 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase0.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase0.il
index d7b460e0f06d7a..b161e10ccf53be 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase0.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase0.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase0 {}
 
 
@@ -80,6 +81,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase1.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase1.il
index 5a14ef53b8b4b4..574b95c3beb0db 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase1.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase1 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase2.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase2.il
index 8ed07b6f751de9..9cab4a6ad004bb 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase2.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase2 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase3.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase3.il
index 35614b38092536..59d64bb05b69f8 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase3.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase3 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase4.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase4.il
index 814a7f0279d191..6f51f6eefd04e1 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase4.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase4.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase4 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase5.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase5.il
index 5401147e5fdf26..d2aaae57daaab2 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase5.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase5.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase5 {}
 
 
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase6.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase6.il
index f1becb00447729..cbca459ee3b0f6 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase6.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_I_Nested_J/TestCase6.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase6 {}
 
 
@@ -63,6 +64,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase0.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase0.il
index 0b4f28a8b8a1de..24a22ac792b6a9 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase0.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase0.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase0 {}
 
 
@@ -80,6 +81,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase1.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase1.il
index 9adc42bbb35b1e..0b9c73cd4cd431 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase1.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase1 {}
 
 
@@ -62,6 +63,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase2.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase2.il
index 5b312f07c5887e..44c196099168ee 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase2.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase2 {}
 
 
@@ -62,6 +63,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase3.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase3.il
index a4b83b59b72d4c..cb2b0105b4f3f7 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase3.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase3 {}
 
 
@@ -62,6 +63,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase4.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase4.il
index f3e44f9f433fd5..952045ba8c653c 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase4.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase4.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase4 {}
 
 
@@ -62,6 +63,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase5.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase5.il
index 606bb11b9eef0f..e314bcf3413710 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase5.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase5.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase5 {}
 
 
@@ -62,6 +63,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase6.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase6.il
index 678d9d5c93eaab..017c0fd2881c83 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase6.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J/TestCase6.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase6 {}
 
 
@@ -62,6 +63,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase0.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase0.il
index b6deaebb9e4edc..b3d249302d773a 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase0.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase0.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase0 {}
 
 
@@ -78,6 +79,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase1.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase1.il
index da6369eea0dc30..5ef3be8e9c5a1c 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase1.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase1 {}
 
 
@@ -61,6 +62,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase2.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase2.il
index da7298c05d84a5..c54bfcc7b3f258 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase2.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase2 {}
 
 
@@ -61,6 +62,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase3.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase3.il
index 3a02e7757a40bf..ee345825e07b78 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase3.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase3 {}
 
 
@@ -61,6 +62,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase4.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase4.il
index 01f95d0b24ae9d..3243bacf63e196 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase4.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase4.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase4 {}
 
 
@@ -61,6 +62,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase5.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase5.il
index a3707b1958296b..98c9cfb5c4c946 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase5.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase5.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase5 {}
 
 
@@ -61,6 +62,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase6.il b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase6.il
index 2538586cf5ecdc..9eee4c174d8083 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase6.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/Nested_J_Nested_I/TestCase6.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib {}
+.assembly extern xunit.core {}
 .assembly TestCase6 {}
 
 
@@ -61,6 +62,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase0.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase0.il
index 4d607623419abf..876b50fc573a4c 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase0.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase0.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase0 {}
 
@@ -77,6 +78,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase1.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase1.il
index 99171238e3a097..f2e2e86f050b09 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase1.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase1 {}
 
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase2.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase2.il
index 6079121937f2d6..4ab800db493dba 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase2.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase2 {}
 
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase3.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase3.il
index ae854193b33a67..0b145237da57c4 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase3.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase3 {}
 
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase4.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase4.il
index afd503685a7e0d..aff8e532332ba1 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase4.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase4.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase4 {}
 
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase5.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase5.il
index 8bed1df35601a2..446f1eeb33547a 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase5.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase5.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase5 {}
 
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase6.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase6.il
index 90fe9ffc0de64c..032daf5e6fd9c2 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase6.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase6.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase6 {}
 
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/InterfaceFolding/TestCase7.il b/src/tests/Loader/classloader/InterfaceFolding/TestCase7.il
index ed90b3796be3ff..dd8ff6235fcfc4 100644
--- a/src/tests/Loader/classloader/InterfaceFolding/TestCase7.il
+++ b/src/tests/Loader/classloader/InterfaceFolding/TestCase7.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly TestCase0 {}
 
@@ -82,6 +83,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     newobj     instance void C::.ctor()
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnitTest.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnitTest.il
index 4ba6b206411031..eb263f608b678c 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnitTest.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnitTest.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly UnitTest { }
@@ -1137,6 +1138,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init ( bool result )
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario1.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario1.il
index 52e67a0a87f284..2c9cef445df23c 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario1.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario1.il
@@ -6,6 +6,7 @@
 // implemented by classes
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { }
 .assembly UnsupportedScenario2 { }
 
@@ -196,6 +197,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (bool V_0)    
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario2.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario2.il
index 2e4c21dc424925..33413f02e6978b 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario2.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario2.il
@@ -5,6 +5,7 @@
 // Scenario being tested here: covariant returns on default interface methods.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly UnsupportedScenario2 { }
@@ -196,6 +197,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (bool V_0)    
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario3.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario3.il
index 5575857b2ac99f..2f6d99655091ce 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario3.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Interfaces/UnsupportedScenario3.il
@@ -6,6 +6,7 @@
 // implemented by structs
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { }
 .assembly UnsupportedScenario3 { }
 
@@ -223,6 +224,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (bool V_0)    
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/ImplicitOverrideSameSigAsDecl.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/ImplicitOverrideSameSigAsDecl.il
index b217bffb1e24ab..2d8ed43645a7e8 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/ImplicitOverrideSameSigAsDecl.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/ImplicitOverrideSameSigAsDecl.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly ImplicitOverrideSameSigAsDecl { }
@@ -311,6 +312,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (bool V_0)    
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/OverrideSameSigAsDecl.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/OverrideSameSigAsDecl.il
index 1f069ef5d6c450..2064a845e5f0e7 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/OverrideSameSigAsDecl.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/ReturnTypeValidation/OverrideSameSigAsDecl.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly OverrideSameSigAsDecl { }
@@ -343,6 +344,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (bool V_0)    
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Structs/IncompatibleOverride.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Structs/IncompatibleOverride.il
index 036a7c58e3143d..39c67576567e98 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Structs/IncompatibleOverride.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/Structs/IncompatibleOverride.il
@@ -8,6 +8,7 @@
 //
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { }
 .assembly IncompatibleOverride { }
 
@@ -202,6 +203,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init (bool V_0)    
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/AttributeTesting.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/AttributeTesting.il
index 652feec3fb5d11..6c0a9ceae4444b 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/AttributeTesting.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/AttributeTesting.il
@@ -42,6 +42,7 @@
 //
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly AttributeTesting { }
@@ -1127,6 +1128,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init ( bool result )
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/CompatibleWithTest.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/CompatibleWithTest.il
index 75e580398676bb..9af1b72756ed13 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/CompatibleWithTest.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/CompatibleWithTest.il
@@ -1,4 +1,5 @@
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Collections { }
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
@@ -784,6 +785,9 @@
 
     .method public hidebysig static int32 Main(string[] args) cil managed
     {
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         .locals init ( bool result )
 
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/OverrideMoreDerivedReturn.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/OverrideMoreDerivedReturn.il
index 9914558c7d9b2d..5a3f94b6a9b786 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/OverrideMoreDerivedReturn.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/OverrideMoreDerivedReturn.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly ReOverrideMoreDerivedReturn { }
@@ -611,6 +612,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init ( bool result )
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest.il
index ea028e507b19c3..1f91183ae7ff85 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly UnitTest { }
@@ -1215,6 +1216,9 @@
   
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init ( bool result )
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestDelegates.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestDelegates.il
index 592f398d418344..5ee3b7f6b850ac 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestDelegates.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestDelegates.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly UnitTestDelegates { }
 
@@ -1102,6 +1103,9 @@
 
   .method private hidebysig static int32 Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init ( bool result )
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestMultiModule.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestMultiModule.il
index 2a135021243141..a17d1166512506 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestMultiModule.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTestMultiModule.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 
@@ -172,6 +173,9 @@
 
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init ( bool result )
diff --git a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest_GVM.il b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest_GVM.il
index 367009658d39d0..67e5b8f185b656 100644
--- a/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest_GVM.il
+++ b/src/tests/Loader/classloader/MethodImpl/CovariantReturns/UnitTest/UnitTest_GVM.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly extern mscorlib { }
 .assembly UnitTest_GVM { }
@@ -734,6 +735,9 @@
   // ===================================================================================== //
   .method public hidebysig static int32  Main( string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     .locals init ( bool result )
diff --git a/src/tests/Loader/classloader/MethodImpl/Desktop/self_override2.il b/src/tests/Loader/classloader/MethodImpl/Desktop/self_override2.il
index 0d6f7d48508c3f..4e0ac204d4632e 100644
--- a/src/tests/Loader/classloader/MethodImpl/Desktop/self_override2.il
+++ b/src/tests/Loader/classloader/MethodImpl/Desktop/self_override2.il
@@ -7,6 +7,7 @@
 // b.DoBar() will invoke MyBar::DoSelfBar().
 
 .assembly extern mscorlib{}
+.assembly extern xunit.core {}
 .assembly self_override2{}
 
 .class public auto ansi beforefieldinit MyBar
@@ -61,6 +62,9 @@
 {
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       43 (0x2b)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/MethodImpl/Desktop/self_override5.il b/src/tests/Loader/classloader/MethodImpl/Desktop/self_override5.il
index 21e9d0468da775..b35cba6c868ae8 100644
--- a/src/tests/Loader/classloader/MethodImpl/Desktop/self_override5.il
+++ b/src/tests/Loader/classloader/MethodImpl/Desktop/self_override5.il
@@ -19,6 +19,7 @@
 // - dmilirud
 
 .assembly extern mscorlib{}
+.assembly extern xunit.core {}
 .assembly self_override5{}
 
 .class public MyBar extends [mscorlib]System.Object
@@ -72,6 +73,9 @@
 
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 
     .locals init (bool V_0,
diff --git a/src/tests/Loader/classloader/MethodImpl/generics_override1.il b/src/tests/Loader/classloader/MethodImpl/generics_override1.il
index a0234b60831721..3037f18c30bf39 100644
--- a/src/tests/Loader/classloader/MethodImpl/generics_override1.il
+++ b/src/tests/Loader/classloader/MethodImpl/generics_override1.il
@@ -13,6 +13,7 @@
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly Program
 {
   .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -1013,6 +1014,9 @@
 
   .method private hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       174 (0xae)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/MethodImpl/override_override1.il b/src/tests/Loader/classloader/MethodImpl/override_override1.il
index 3af566e687c92e..8b92de84911b90 100644
--- a/src/tests/Loader/classloader/MethodImpl/override_override1.il
+++ b/src/tests/Loader/classloader/MethodImpl/override_override1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // MyFoo is a normal reference type with virtual method DoFoo()
 // MyBar is a normal reference type that extends MyFoo.
 // MyBar::DoBar explicitly overrides MyFoo::DoFoo
@@ -98,6 +99,9 @@
 
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       43 (0x2b)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/MethodImpl/self_override1.il b/src/tests/Loader/classloader/MethodImpl/self_override1.il
index 16f4207ad3ca1a..0df6b8c228a598 100644
--- a/src/tests/Loader/classloader/MethodImpl/self_override1.il
+++ b/src/tests/Loader/classloader/MethodImpl/self_override1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // MyBar is an abstract class which declares an abstract method MyBar::DoBar().
 // MyBar also DoSelfBar() that explicitly overrides DoBar().
 // BarImpl extends MyBar and also overrides DoBar().
@@ -84,6 +85,9 @@
 {
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       66 (0x42)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/MethodImpl/self_override3.il b/src/tests/Loader/classloader/MethodImpl/self_override3.il
index f7843f83752141..f01b4f43f2bfa4 100644
--- a/src/tests/Loader/classloader/MethodImpl/self_override3.il
+++ b/src/tests/Loader/classloader/MethodImpl/self_override3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // MyBar is a normal reference type.
 // MyBar::DoSelfBar explicitly overrides MyBar::DoBar
 // DoSelfBar has a different signature than DoBar.
@@ -73,6 +74,9 @@
 
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       43 (0x2b)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/PrivateInterfaceImpl/Test6_ImplementingClass.il b/src/tests/Loader/classloader/PrivateInterfaceImpl/Test6_ImplementingClass.il
index 004bb130a9104a..4e0c98fb20ed89 100644
--- a/src/tests/Loader/classloader/PrivateInterfaceImpl/Test6_ImplementingClass.il
+++ b/src/tests/Loader/classloader/PrivateInterfaceImpl/Test6_ImplementingClass.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.40922.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
@@ -71,6 +72,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       130 (0x82)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t1.il b/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t1.il
index 5d86a21a31272b..ffc1a3d33fdaca 100644
--- a/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t1.il
+++ b/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { } 
 .assembly typeload { }
 
@@ -16,6 +17,9 @@
 
   .method public static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (valuetype main/NumberNode[] V_0,
 		  class [mscorlib]System.Exception V_1,                  
diff --git a/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t2.il b/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t2.il
index 2d349fc7d3b2b7..cf1d04ec87e55b 100644
--- a/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t2.il
+++ b/src/tests/Loader/classloader/SequentialLayout/Regress/217070/t2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { } 
 .assembly typeload { } 
 .class sequential sealed public NumberNode 
@@ -16,6 +17,9 @@
 
   .method public static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (valuetype NumberNode[] V_0,
 		  class [mscorlib]System.Exception V_1,                  
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/GenericContext/GenericContextTest.il b/src/tests/Loader/classloader/StaticVirtualMethods/GenericContext/GenericContextTest.il
index 4ae58ee32cbd43..4deeb6fd9a0985 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/GenericContext/GenericContextTest.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/GenericContext/GenericContextTest.il
@@ -3,6 +3,7 @@
 
 // THIS FILE IS AUTOGENERATED EDIT Generator/Program.cs instead and rerun the generator
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern GenericContextCommonCs {}
@@ -19965,6 +19966,9 @@
   } // end of method Test_CreateDelegate_GenericOverTypeParameterGenericValuetype_GenericOverString_CuriouslyRecurringGeneric_GenericMethodOverTypeParameter<T>
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/InterfaceVariance/InterfaceVariance.il b/src/tests/Loader/classloader/StaticVirtualMethods/InterfaceVariance/InterfaceVariance.il
index 63eeb79f937ab9..a4c4e9e1965669 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/InterfaceVariance/InterfaceVariance.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/InterfaceVariance/InterfaceVariance.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -134,6 +135,9 @@
 
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
 
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/CuriouslyRecurringGenericWithUnimplementedMethod.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/CuriouslyRecurringGenericWithUnimplementedMethod.il
index e4a952e1c13e9b..0ff093a38286ea 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/CuriouslyRecurringGenericWithUnimplementedMethod.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/CuriouslyRecurringGenericWithUnimplementedMethod.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -30,6 +31,9 @@
   } // end of method Test_Scenario1
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodBodyOnUnrelatedType.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodBodyOnUnrelatedType.il
index 309d0b5ae6d6c2..f6a8d0aebe619b 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodBodyOnUnrelatedType.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodBodyOnUnrelatedType.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -50,6 +51,9 @@
   } // end of method Test_Scenario1
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodConstraintMismatch.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodConstraintMismatch.il
index bc957e1ff4d9d3..f4356c3a7753b5 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodConstraintMismatch.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodConstraintMismatch.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -39,6 +40,9 @@
   } // end of method Test_Scenario1
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodFlags.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodFlags.il
index 187b4ca8054364..33d55dba2fd562 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodFlags.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MethodFlags.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -67,6 +68,9 @@
 
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MultipleMethodImplRecordsSameMethodDecl.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MultipleMethodImplRecordsSameMethodDecl.il
index 4c8fa8acd56005..fb5397704a5357 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MultipleMethodImplRecordsSameMethodDecl.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/MultipleMethodImplRecordsSameMethodDecl.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -53,6 +54,9 @@
   } // end of method Test_Scenario1
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnAbstractClass.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnAbstractClass.il
index a4109f46a74704..4f328e0761394d 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnAbstractClass.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnAbstractClass.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -91,6 +92,9 @@
 
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
 
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnConcreteClass.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnConcreteClass.il
index f861c8dd32a956..7155a29cbdd606 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnConcreteClass.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/UnimplementedAbstractMethodOnConcreteClass.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -30,6 +31,9 @@
   } // end of method Test_Scenario1
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/VarianceSafety.il b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/VarianceSafety.il
index c58f1033f80ede..2c6666f926462f 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/VarianceSafety.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/NegativeTestCases/VarianceSafety.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -42,6 +43,9 @@
 
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest.il b/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest.il
index 57a99245aa0683..a2b6e991993ba5 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest.il
@@ -3,6 +3,7 @@
 
 // THIS FILE IS AUTOGENERATED EDIT Generator/Program.cs instead and rerun the generator
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -9580,6 +9581,9 @@
   } // end of method Test_Scenario276
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest_minimal.il b/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest_minimal.il
index bae6f2efba9d15..2124789165b9b1 100644
--- a/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest_minimal.il
+++ b/src/tests/Loader/classloader/StaticVirtualMethods/TypeHierarchy/TypeHierarchyTest_minimal.il
@@ -3,6 +3,7 @@
 
 // THIS FILE IS AUTOGENERATED EDIT Generator/Program.cs instead and rerun the generator
 .assembly extern System.Console {}
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern System.Runtime {}
 .assembly extern TypeHierarchyCommonCs {}
@@ -46,6 +47,9 @@
   } // end of method Test_Scenario1
   .method public static int32 Main() cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [System.Runtime]System.Exception V_0)
     .try {
diff --git a/src/tests/Loader/classloader/Statics/Misc/LiteralStatic.il b/src/tests/Loader/classloader/Statics/Misc/LiteralStatic.il
index e4c08c17f6a231..5a700b1dfd0a9a 100644
--- a/src/tests/Loader/classloader/Statics/Misc/LiteralStatic.il
+++ b/src/tests/Loader/classloader/Statics/Misc/LiteralStatic.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // test that LDSFLD of a literal static field throws a MissingFieldException
 
 .assembly extern mscorlib {}
@@ -23,6 +24,9 @@
 
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       34 (0x22)
     .maxstack  8
diff --git a/src/tests/Loader/classloader/Statics/Regressions/484837/Enum_ValueField.il b/src/tests/Loader/classloader/Statics/Regressions/484837/Enum_ValueField.il
index 831236eb7a8c54..f8d241a58ceb03 100644
--- a/src/tests/Loader/classloader/Statics/Regressions/484837/Enum_ValueField.il
+++ b/src/tests/Loader/classloader/Statics/Regressions/484837/Enum_ValueField.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // This is regression test for VSW 484837
 // In this case, value__ is the last field as seen below (C# always generates value__ as the very first field.). 
 // Because of a bug in the code, Module::ParseMetadataForStaticsIsTypeDefEnum() just looked at the very first // field and took it to be value. 
@@ -28,6 +29,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 
     .entrypoint
     .locals init (valuetype MyEnum V_0)
diff --git a/src/tests/Loader/classloader/TSAmbiguities/CollapsedInterfaces/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/CollapsedInterfaces/HelloWorld.il
index 1e478185281002..f1b6b78154eb19 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/CollapsedInterfaces/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/CollapsedInterfaces/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20512.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       337 (0x151)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/InterfaceDefinition/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/InterfaceDefinition/HelloWorld.il
index f9ce013f6f0d1a..8ce41af8303149 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/InterfaceDefinition/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/InterfaceDefinition/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20508.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -61,6 +62,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       450 (0x1c2)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/Override/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/Override/HelloWorld.il
index ebee6f2452c1cf..17ab4d737cc744 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/Override/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/CollapsedMethods/Override/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20508.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       313 (0x139)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/CollapsedInterfaces/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/CollapsedInterfaces/HelloWorld.il
index 146503ce52d119..f0f4c3321f3597 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/CollapsedInterfaces/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/CollapsedInterfaces/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20512.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       382 (0x17e)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/Override/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/Override/HelloWorld.il
index 4ccca2bd690826..be0feb6dbf296d 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/Override/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/SameMethodImpl/Override/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20512.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       171 (0xab)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_CollapsedInterfaces/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_CollapsedInterfaces/HelloWorld.il
index 7bd1a19b4d6d31..a8bff78363a5de 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_CollapsedInterfaces/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_CollapsedInterfaces/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20512.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       72 (0x48)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_InherittedCollision/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_InherittedCollision/HelloWorld.il
index f7b28601e9a3b7..2c852bf3eac210 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_InherittedCollision/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/Variance/Covariant_InherittedCollision/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20512.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       129 (0x81)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_CollapsedInterfaces/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_CollapsedInterfaces/HelloWorld.il
index 54ce4a4d83df7d..fac0d2e9cf3fed 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_CollapsedInterfaces/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_CollapsedInterfaces/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20512.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       72 (0x48)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_InherittedCollision/HelloWorld.il b/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_InherittedCollision/HelloWorld.il
index 95b54e00978de7..70c6178d3fc524 100644
--- a/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_InherittedCollision/HelloWorld.il
+++ b/src/tests/Loader/classloader/TSAmbiguities/Variance/Variant_InherittedCollision/HelloWorld.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20512.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -40,6 +41,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       129 (0x81)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TypeForwarding/UnitTest/UnitTest.il b/src/tests/Loader/classloader/TypeForwarding/UnitTest/UnitTest.il
index d7e62b89b14376..e913f0c22e367d 100644
--- a/src/tests/Loader/classloader/TypeForwarding/UnitTest/UnitTest.il
+++ b/src/tests/Loader/classloader/TypeForwarding/UnitTest/UnitTest.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { } 
+.assembly extern xunit.core {}
 
 .assembly extern MyDep
 {
@@ -17,6 +18,9 @@
 {
   .method public hidebysig static int32  Main(string[] args) cil managed noinlining
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       410 (0x19a)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowLDFTNStaticMethod.il b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowLDFTNStaticMethod.il
index ebc6a7ffb8167a..364b7cdc518145 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowLDFTNStaticMethod.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowLDFTNStaticMethod.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // A .cctor has only one chance to run in any appdomain. 
 // If it fails, the 2nd time we try to access a static field we check if .cctor has been run. 
 // And it has, but failed so we fail again.
@@ -105,6 +106,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       279 (0x117)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowStaticFieldBFI.il b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowStaticFieldBFI.il
index 43303a27e03cec..5d49fe5459bad6 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowStaticFieldBFI.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/CctorThrowStaticFieldBFI.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50103.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
@@ -91,6 +92,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       405 (0x195)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/ResetGlobalFields.il b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/ResetGlobalFields.il
index 7130d78cc05c3a..94f81707ce320f 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/ResetGlobalFields.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/ResetGlobalFields.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50110.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
@@ -64,6 +65,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       61 (0x3d)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/TypeLoadInitExcepBFI.il b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/TypeLoadInitExcepBFI.il
index a0bdeffb4e305c..c6d2657ab997f2 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/TypeLoadInitExcepBFI.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/TypeLoadInitExcepBFI.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50103.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
@@ -91,6 +92,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       405 (0x195)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/UntrustedCodeBFI.il b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/UntrustedCodeBFI.il
index 80b03be0496bab..fbcf179ff8db02 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/UntrustedCodeBFI.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CctorsWithSideEffects/UntrustedCodeBFI.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 
 .assembly extern mscorlib {}
@@ -89,6 +90,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       98 (0x62)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorFourThreadsBFI.il b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorFourThreadsBFI.il
index a42069a053ac29..a0af39fdc089b5 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorFourThreadsBFI.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorFourThreadsBFI.il
@@ -5,6 +5,7 @@
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50103.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Threading.Thread { auto }
 // Metadata version: v2.0.50103
 .assembly extern mscorlib { auto }
@@ -307,6 +308,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       302 (0x12e)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads01BFI.il b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads01BFI.il
index 71a54148c8b75c..3b2745be079fd2 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads01BFI.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads01BFI.il
@@ -5,6 +5,7 @@
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50103.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Threading.Thread { auto }
 // Metadata version: v2.0.50103
 .assembly extern mscorlib { auto }
@@ -312,6 +313,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       244 (0xf4)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads02BFI.il b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads02BFI.il
index 7a908131f5b02e..c360039d1ca285 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads02BFI.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads02BFI.il
@@ -5,6 +5,7 @@
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50103.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Threading.Thread { auto }
 // Metadata version: v2.0.50103
 .assembly extern mscorlib { auto }
@@ -315,6 +316,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       244 (0xf4)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads03BFI.il b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads03BFI.il
index 4c653e7c95d3ea..870f9029b71ffb 100644
--- a/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads03BFI.il
+++ b/src/tests/Loader/classloader/TypeInitialization/CircularCctors/CircularCctorThreeThreads03BFI.il
@@ -5,6 +5,7 @@
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50103.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Threading.Thread { auto }
 // Metadata version: v2.0.50103
 .assembly extern mscorlib { auto }
@@ -318,6 +319,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       244 (0xf4)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test10.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test10.il
index 879306a9bd1169..708e1121afd623 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test10.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test10.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // non-blittable by objref field, large offset
 .assembly test10{}
 .assembly extern mscorlib{}
@@ -21,6 +22,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test11.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test11.il
index d1be2c8fedee6d..a563af7cf517a4 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test11.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test11.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // non-blittable by objref field, really large offset, and force GC collect
 .assembly test10{}
 .assembly extern mscorlib{}
@@ -21,6 +22,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test13.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test13.il
index c44c2aeef8a74a..6e3811b48ced02 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test13.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test13.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // non-blittable by objref field, large offset, large field size
 .assembly test13{}
 .assembly extern mscorlib{}
@@ -26,6 +27,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test14.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test14.il
index ec0c69c3ea7f29..81b41d390f8d0b 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test14.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test14.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // non-blittable by objref field, small offset, large field size
 .assembly test14{}
 .assembly extern mscorlib{}
@@ -25,6 +26,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test15.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test15.il
index 31a020f29b7205..c11a96093babe6 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test15.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test15.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // blittable, small offset, large field size
 .assembly test15{}
 .assembly extern mscorlib{}
@@ -25,6 +26,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test16.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test16.il
index bf26dac6fd8aa8..be2ce0a40a6a44 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test16.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test16.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // non-blittable by objref field, small offset, large field size, overlapping objref field
 .assembly test16{}
 .assembly extern mscorlib{}
@@ -26,6 +27,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
     .locals init (class [mscorlib]System.Exception e2)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test2.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test2.il
index f9a6715c72b70f..37a0ab1ed38fbd 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test2.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // blittable, large field offset.
 // this case never caused a stack overflow.  
 // this test simply ensures continued correct behavior.
@@ -20,6 +21,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test21.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test21.il
index 8369787aee92b1..9172c231033134 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test21.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test21.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // valuetype non-blittable by objref field, large offset, small field size, overlapped objref
 .assembly test21{}
 .assembly extern mscorlib{}
@@ -14,6 +15,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
     .locals init (class [mscorlib]System.Exception e2)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test23.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test23.il
index 02462e15ba8f7c..7f6d28b7830b58 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test23.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test23.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // non-blittable by objref field, large offset, large field size, 
 // one field is a valuetype that has an objref member field
 // (this is to hit EEClass::CheckValueClassLayout())
@@ -29,6 +30,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test24.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test24.il
index 08235ba16aa780..1e555a0f0611b5 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test24.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test24.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // sequential, non-blittable by objref field, large offset, large field size
 .assembly test24{}
 .assembly extern mscorlib{}
@@ -26,6 +27,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
 	.locals init(class Class1 c1)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test3.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test3.il
index 0791bff8b0211a..0875d37283a2cb 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test3.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // blittable, absurdly large field offset, expect TypeLoadException
 .assembly test3{}
 .assembly extern mscorlib{}
@@ -20,6 +21,9 @@
 
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
     .locals init (class [mscorlib]System.Exception e2)
diff --git a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test9.il b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test9.il
index f0e9d7ad68d40e..cb905948d54c0d 100644
--- a/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test9.il
+++ b/src/tests/Loader/classloader/explicitlayout/Regressions/ASURT/ASURT150271/test9.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // non-blittable by objref field, objref overlaps int32, large offset
 .assembly test9{}
 .assembly extern mscorlib{}
@@ -21,6 +22,9 @@
 }
 
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 
     .locals init (class [mscorlib]System.Exception e2)
diff --git a/src/tests/Loader/classloader/generics/GenericMethods/arity01.il b/src/tests/Loader/classloader/generics/GenericMethods/arity01.il
index bdc5c16d1feaf6..c41114d9b28317 100644
--- a/src/tests/Loader/classloader/generics/GenericMethods/arity01.il
+++ b/src/tests/Loader/classloader/generics/GenericMethods/arity01.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.1.2019.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -168,6 +169,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       478 (0x1de)
     .maxstack  4
diff --git a/src/tests/Loader/classloader/generics/GenericMethods/method014.il b/src/tests/Loader/classloader/generics/GenericMethods/method014.il
index fbd9d9cb36f6be..541596f01b631c 100644
--- a/src/tests/Loader/classloader/generics/GenericMethods/method014.il
+++ b/src/tests/Loader/classloader/generics/GenericMethods/method014.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.2.2204.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -161,6 +162,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       142 (0x8e)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/generics/GenericMethods/method016.il b/src/tests/Loader/classloader/generics/GenericMethods/method016.il
index 726bd41f91a296..4039a7538b7adf 100644
--- a/src/tests/Loader/classloader/generics/GenericMethods/method016.il
+++ b/src/tests/Loader/classloader/generics/GenericMethods/method016.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.2.2204.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -198,6 +199,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       142 (0x8e)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/Type_ofT_Inherit_FromT.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/Type_ofT_Inherit_FromT.il
index 22d98577cee6d5..3e2e3b5359bcf8 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/Type_ofT_Inherit_FromT.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/Type_ofT_Inherit_FromT.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // this test makes sure a generic type of form X<T> can't inherit from T
 
 // class X_ofT<T> extends T
@@ -139,6 +140,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       239 (0xef)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract01.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract01.il
index 91d7ae351ab93b..6072fae34d5553 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract01.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract01.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.1.2019.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -175,6 +176,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract02.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract02.il
index e6882cfca5bb19..d5ed3e2d7a9d66 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract02.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract02.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly abstract02{.custom instance void [mscorlib]System.Security.SecurityRulesAttribute::.ctor(valuetype [mscorlib]System.Security.SecurityRuleSet) = ( 01 00 02 00 00 )  .custom instance void [mscorlib]System.Security.SecurityTransparentAttribute::.ctor() = ( 01 00 00 00 )}
 
@@ -157,6 +158,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract03.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract03.il
index 847f46e5fae057..b829c77d82de88 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract03.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract03.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly abstract03{}
 
@@ -130,6 +131,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       53 (0x35)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract04.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract04.il
index cafb4e2bae7495..5f77e945d88ffb 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract04.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract04.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib{}
 .assembly abstract04{}
 
@@ -139,6 +140,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract05.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract05.il
index 789d770e0cc113..e242c7368e8eac 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract05.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract05.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // 
 // This tests that a generic class that implements an abstract interface cannot 
@@ -183,6 +184,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract06.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract06.il
index 12199343db2951..03e2831eb896d7 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract06.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract06.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // 
 // This tests that a non-generic class that implements a generic abstract interface cannot 
@@ -182,6 +183,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       53 (0x35)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract07.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract07.il
index 21bcbe840c292f..783ba97cccc6c4 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract07.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract07.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // 
 // This tests that a generic class that implements a non-generic abstract interface cannot 
@@ -182,6 +183,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract08.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract08.il
index ee58cc5dd3ea42..3387b48a8855ed 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract08.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract08.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // 
 // This tests that a generic struct that implements a generic abstract interface cannot 
@@ -174,6 +175,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract09.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract09.il
index a1db8b1a3f631a..812c55cd64eb56 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract09.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract09.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // 
 // This tests that a non-generic struct that implements a generic abstract interface cannot 
@@ -147,6 +148,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       53 (0x35)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract10.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract10.il
index 624dd438022115..482437c096dacc 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract10.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/abstract10.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // 
 // This tests that a generic struct that implements a non-generic abstract interface cannot 
@@ -177,6 +178,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param01.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param01.il
index 50d534c50ba917..bf2a24a804c1b1 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param01.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param01.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // This tests that a MissingMethodException is thrown when a constructor
 // of a generic class is invoked via newobj without a type parameter.
@@ -182,6 +183,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param02.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param02.il
index e069eb9ba59fbf..2e528c4ce01fdc 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param02.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param02.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // This tests that a TypeLoadException is thrown when a constructor
 // of a generic class with one formal type parameter is invoked via newobj 
@@ -182,6 +183,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param03.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param03.il
index f632c7bbc7c083..052d7ff4e5cd42 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param03.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param03.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // This tests that a MissingMethodException is thrown when an instance method
 // of a generic class with one formal type parameter is invoked via the call
@@ -172,6 +173,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param04.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param04.il
index cf0acfee2e4536..c350d7a81aa90b 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param04.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param04.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // DESCRIPTION:
 // This tests that a TypeLoadException is thrown when an instance method
 // of a generic class with one formal type parameter is invoked via the call
@@ -172,6 +173,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param05.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param05.il
index d6bd3227eccf7f..9b491f567577fe 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param05.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param05.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.1.2019.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -166,6 +167,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param06.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param06.il
index ff4fd51779f849..5909932eb6bcb1 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param06.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param06.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.1.2019.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -166,6 +167,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param07.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param07.il
index 04b7ca266ed6c7..417193c7b0a1e2 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param07.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param07.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.1.2019.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -163,6 +164,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/Instantiation/Negative/param08.il b/src/tests/Loader/classloader/generics/Instantiation/Negative/param08.il
index ed762cd32a6a1c..86c795810f81d2 100644
--- a/src/tests/Loader/classloader/generics/Instantiation/Negative/param08.il
+++ b/src/tests/Loader/classloader/generics/Instantiation/Negative/param08.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.1.2019.0
 //  Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
@@ -163,6 +164,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       113 (0x71)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/generics/VSD/Class_ExplicitOverrideVirtualNewslot.il b/src/tests/Loader/classloader/generics/VSD/Class_ExplicitOverrideVirtualNewslot.il
index 713d1313501dbf..4e6e19ca9efb32 100644
--- a/src/tests/Loader/classloader/generics/VSD/Class_ExplicitOverrideVirtualNewslot.il
+++ b/src/tests/Loader/classloader/generics/VSD/Class_ExplicitOverrideVirtualNewslot.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // This test is the same as ExplicitOverrideVirtualNewslotFinal.cs
 // The difference is that here the virtual methods are 'virtual newslot' as opposed to
 // 'virtual newslot final'
@@ -816,6 +817,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       73 (0x49)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/generics/VSD/Struct_ExplicitOverrideVirtualNewslot.il b/src/tests/Loader/classloader/generics/VSD/Struct_ExplicitOverrideVirtualNewslot.il
index 042e5fa99392b6..7f5c25acddde19 100644
--- a/src/tests/Loader/classloader/generics/VSD/Struct_ExplicitOverrideVirtualNewslot.il
+++ b/src/tests/Loader/classloader/generics/VSD/Struct_ExplicitOverrideVirtualNewslot.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 // this test is the same as Struct_ExplicitOverrideVirtualNewslotFinal.cs only for 'virtual newslot' instead of 
 // 'virtual newslot final'
@@ -803,6 +804,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       73 (0x49)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/generics/VSD/Struct_ImplicitOverrideVirtualNewslot.il b/src/tests/Loader/classloader/generics/VSD/Struct_ImplicitOverrideVirtualNewslot.il
index 6d200c5d052fde..cb456154ae07b6 100644
--- a/src/tests/Loader/classloader/generics/VSD/Struct_ImplicitOverrideVirtualNewslot.il
+++ b/src/tests/Loader/classloader/generics/VSD/Struct_ImplicitOverrideVirtualNewslot.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // this test is the equivalent of Class_ImplicitOverrideVirtualNewslot.cs for structs.
 // The reason we are using IL is because C# doesn't allow struct to have virtual methods with 'virtual' keyword.
 // Methods that implement interface methods are by default virtual (which translates to 'virtual newslot final' in IL.
@@ -795,6 +796,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       73 (0x49)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/generics/Variance/Interfaces/NoVarianceCheckForStaticMethods.il b/src/tests/Loader/classloader/generics/Variance/Interfaces/NoVarianceCheckForStaticMethods.il
index fdb11f2401ec8a..bd362ecb534c58 100644
--- a/src/tests/Loader/classloader/generics/Variance/Interfaces/NoVarianceCheckForStaticMethods.il
+++ b/src/tests/Loader/classloader/generics/Variance/Interfaces/NoVarianceCheckForStaticMethods.il
@@ -7,6 +7,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
   .ver 4:2:2:0
 }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
@@ -41,6 +42,9 @@
 {
   .method private hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       34 (0x22)
     .maxstack  8
@@ -92,4 +96,4 @@
 
 // =============================================================
 
-// *********** DISASSEMBLY COMPLETE ***********************
\ No newline at end of file
+// *********** DISASSEMBLY COMPLETE ***********************
diff --git a/src/tests/Loader/classloader/generics/Variance/Regressions/dev10_468712/dev10_468712.il b/src/tests/Loader/classloader/generics/Variance/Regressions/dev10_468712/dev10_468712.il
index 18e10d7e12ef0b..b0007d5517f8e8 100644
--- a/src/tests/Loader/classloader/generics/Variance/Regressions/dev10_468712/dev10_468712.il
+++ b/src/tests/Loader/classloader/generics/Variance/Regressions/dev10_468712/dev10_468712.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.10707.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -74,6 +75,9 @@
 {
   .method public static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init ([0] class ConsoleApplicationVB.ICovariant`1<object> y)
diff --git a/src/tests/Loader/classloader/generics/regressions/109968/test.il b/src/tests/Loader/classloader/generics/regressions/109968/test.il
index 62ca9d1b5f853b..a76c987a03df12 100644
--- a/src/tests/Loader/classloader/generics/regressions/109968/test.il
+++ b/src/tests/Loader/classloader/generics/regressions/109968/test.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 .assembly extern mscorlib {}
 .assembly test {}
@@ -113,6 +114,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       60 (0x3c)
     .maxstack  3
diff --git a/src/tests/Loader/classloader/generics/regressions/dev10_393447/dev10_393447.il b/src/tests/Loader/classloader/generics/regressions/dev10_393447/dev10_393447.il
index 81f3e7f39d7e23..90dc47a2a5d0f4 100644
--- a/src/tests/Loader/classloader/generics/regressions/dev10_393447/dev10_393447.il
+++ b/src/tests/Loader/classloader/generics/regressions/dev10_393447/dev10_393447.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 /*
 
 using System;
@@ -180,6 +181,9 @@ class Program
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       51 (0x33)
     .maxstack  8
diff --git a/src/tests/Loader/classloader/generics/regressions/dev10_531793/dev10_531793.il b/src/tests/Loader/classloader/generics/regressions/dev10_531793/dev10_531793.il
index 5c4c4604d38c22..aaa2ad9212d9ac 100644
--- a/src/tests/Loader/classloader/generics/regressions/dev10_531793/dev10_531793.il
+++ b/src/tests/Loader/classloader/generics/regressions/dev10_531793/dev10_531793.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib
 {
   .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
@@ -49,6 +50,9 @@
 {
   .method public static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
     .locals init ([0] class T1 t, [1] class N`1<class T1> v, int32)
diff --git a/src/tests/Loader/classloader/generics/regressions/vsw395780/testExplicitOverride2.il b/src/tests/Loader/classloader/generics/regressions/vsw395780/testExplicitOverride2.il
index ffb08c13e399cd..f563b787af04d8 100644
--- a/src/tests/Loader/classloader/generics/regressions/vsw395780/testExplicitOverride2.il
+++ b/src/tests/Loader/classloader/generics/regressions/vsw395780/testExplicitOverride2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // this test is also regression test for VSW 395780. The difference is that
 // .override directive in this case is in the class scope, whereas in testExplicitOverride
 // .override directive is in method scope.
@@ -83,6 +84,9 @@
 {
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       105 (0x69)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/nesting/Tests/nesting4.il b/src/tests/Loader/classloader/nesting/Tests/nesting4.il
index f42ba93898379a..5abe69683e580a 100644
--- a/src/tests/Loader/classloader/nesting/Tests/nesting4.il
+++ b/src/tests/Loader/classloader/nesting/Tests/nesting4.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // model revision #2
 // To compile: ilasm nesting4.il
 
@@ -42,6 +43,9 @@
 
   .method public static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [mscorlib]System.Exception V_0,
                   int32 V_1)
diff --git a/src/tests/Loader/classloader/nesting/Tests/nesting63.il b/src/tests/Loader/classloader/nesting/Tests/nesting63.il
index 0153c358e24649..d140e57f1272d7 100644
--- a/src/tests/Loader/classloader/nesting/Tests/nesting63.il
+++ b/src/tests/Loader/classloader/nesting/Tests/nesting63.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // model revision #2
 // To compile: ilasm nesting63.il
 
@@ -61,6 +62,9 @@
 
   .method public static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [mscorlib]System.Exception V_0,
              int32 V_1)
diff --git a/src/tests/Loader/classloader/nesting/Tests/nesting7.il b/src/tests/Loader/classloader/nesting/Tests/nesting7.il
index d90a182ce43ac6..52317caa010941 100644
--- a/src/tests/Loader/classloader/nesting/Tests/nesting7.il
+++ b/src/tests/Loader/classloader/nesting/Tests/nesting7.il
@@ -3,6 +3,7 @@
 
 
 .assembly extern System.Console { auto }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { auto }
 
 // model revision #2
@@ -109,6 +110,9 @@
 
 .method public static int32 Main()
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   .locals init (class [mscorlib]System.Exception V_0,
                 int32 V_1)
diff --git a/src/tests/Loader/classloader/nesting/coreclr/exec3.il b/src/tests/Loader/classloader/nesting/coreclr/exec3.il
index 84b296707234e5..0a7072b7119706 100644
--- a/src/tests/Loader/classloader/nesting/coreclr/exec3.il
+++ b/src/tests/Loader/classloader/nesting/coreclr/exec3.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // model revision #2
 // To compile: ilasm exec3.il
 
@@ -17,6 +18,9 @@
 
   .method public static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class [mscorlib]System.Exception V_0,
                   int32 V_1)
diff --git a/src/tests/Loader/classloader/nesting/coreclr/nesting18.il b/src/tests/Loader/classloader/nesting/coreclr/nesting18.il
index a73148b9a17727..5e4d133a264a39 100644
--- a/src/tests/Loader/classloader/nesting/coreclr/nesting18.il
+++ b/src/tests/Loader/classloader/nesting/coreclr/nesting18.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // model revision #1
 // to compile: ilasm nesting18.il
 
@@ -42,6 +43,9 @@
     // entry point location: nested type
     .method public static int32 Main()
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
  
       .locals init (class Client<class EnclType/NestedType> V_0,
diff --git a/src/tests/Loader/classloader/nesting/coreclr/nesting31.il b/src/tests/Loader/classloader/nesting/coreclr/nesting31.il
index 9b85c06b8d6c3f..42fdabd7a590e7 100644
--- a/src/tests/Loader/classloader/nesting/coreclr/nesting31.il
+++ b/src/tests/Loader/classloader/nesting/coreclr/nesting31.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // model revision #1
 // to compile: ilasm nesting31.il
 
@@ -53,6 +54,9 @@
   // entrypoint location: Enclosing type
   .method public static int32 Main()
   {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
  
       .locals init (class Client V_0,
diff --git a/src/tests/Loader/classloader/regressions/139056/Foo.il b/src/tests/Loader/classloader/regressions/139056/Foo.il
index 81e40efe7fd7f2..885baddfd3da8f 100644
--- a/src/tests/Loader/classloader/regressions/139056/Foo.il
+++ b/src/tests/Loader/classloader/regressions/139056/Foo.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 1.2.30612.00
 //  Copyright (C) Microsoft Corporation 1998-2003. All rights reserved.
@@ -106,6 +107,9 @@
 
   .method public static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class Bar V_0,
              	  class Foo V_1, 
diff --git a/src/tests/Loader/classloader/regressions/181424/test5.il b/src/tests/Loader/classloader/regressions/181424/test5.il
index 49ac50b1b05389..f3fbfb0f877c35 100644
--- a/src/tests/Loader/classloader/regressions/181424/test5.il
+++ b/src/tests/Loader/classloader/regressions/181424/test5.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly test5{}
 .assembly extern test5{}
 .assembly extern mscorlib{}
@@ -48,6 +49,9 @@
 }
 
 .method public static int32 Main(){
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init(int32 retVal)
     // there's no way to get to Foo through TypeRef
diff --git a/src/tests/Loader/classloader/regressions/226741/test3.il b/src/tests/Loader/classloader/regressions/226741/test3.il
index cfb35508987c2d..2b61c2ffd4ccc4 100644
--- a/src/tests/Loader/classloader/regressions/226741/test3.il
+++ b/src/tests/Loader/classloader/regressions/226741/test3.il
@@ -2,11 +2,15 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly test3{}
 .assembly extern mscorlib{}
 
 .class public CMain{
     .method public static int32 Main(){
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         call int32 IFoo::Foo()
         ret
diff --git a/src/tests/Loader/classloader/regressions/421439/Test.il b/src/tests/Loader/classloader/regressions/421439/Test.il
index 616970895fb078..12c0d745b9b127 100644
--- a/src/tests/Loader/classloader/regressions/421439/Test.il
+++ b/src/tests/Loader/classloader/regressions/421439/Test.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly extern RefX1 {}
 .assembly extern ValX1 {}
@@ -34,6 +35,9 @@
 {
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  8
     nop
diff --git a/src/tests/Loader/classloader/regressions/429802/CMain.il b/src/tests/Loader/classloader/regressions/429802/CMain.il
index ddc933cf17b263..00363ba266de8d 100644
--- a/src/tests/Loader/classloader/regressions/429802/CMain.il
+++ b/src/tests/Loader/classloader/regressions/429802/CMain.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.41217.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
@@ -48,6 +49,9 @@
 {
   .method public hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       106 (0x6a)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/regressions/440935/Test.il b/src/tests/Loader/classloader/regressions/440935/Test.il
index 0e58968346c2fb..68cc307f71b44b 100644
--- a/src/tests/Loader/classloader/regressions/440935/Test.il
+++ b/src/tests/Loader/classloader/regressions/440935/Test.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.50117.00
 //  Copyright (C) Microsoft Corporation. All rights reserved.
@@ -45,6 +46,9 @@
 {
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       8 (0x8)
     .maxstack  8
diff --git a/src/tests/Loader/classloader/regressions/452707/b452707.il b/src/tests/Loader/classloader/regressions/452707/b452707.il
index 1d701c137cebe7..144f738517ed7a 100644
--- a/src/tests/Loader/classloader/regressions/452707/b452707.il
+++ b/src/tests/Loader/classloader/regressions/452707/b452707.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 // this is regression test for VSW 452707
 // Overriding MyS.ToString caused an AV since we were attempting to create precode 
 // before the slot that the method desc points to has been filled in.
@@ -35,6 +36,9 @@
 {
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
  
     .maxstack  1
diff --git a/src/tests/Loader/classloader/regressions/GitHub_11371/Negative_ByRefLikeType.il b/src/tests/Loader/classloader/regressions/GitHub_11371/Negative_ByRefLikeType.il
index 6a42a9ec0ee14d..fa3197175abdfa 100644
--- a/src/tests/Loader/classloader/regressions/GitHub_11371/Negative_ByRefLikeType.il
+++ b/src/tests/Loader/classloader/regressions/GitHub_11371/Negative_ByRefLikeType.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { }
 .assembly Negative_ByRefLikeType { }
 
@@ -85,6 +86,9 @@
 
   .method public hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  1
 
diff --git a/src/tests/Loader/classloader/regressions/GitHub_41571/GitHub_41571.il b/src/tests/Loader/classloader/regressions/GitHub_41571/GitHub_41571.il
index 24cc588ca03cb5..040d506c6b72c9 100644
--- a/src/tests/Loader/classloader/regressions/GitHub_41571/GitHub_41571.il
+++ b/src/tests/Loader/classloader/regressions/GitHub_41571/GitHub_41571.il
@@ -8,6 +8,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )                         // .?_....:
   .ver 5:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly '41571'
 {
   .custom instance void [System.Runtime]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ) 
@@ -48,6 +49,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       19 (0x13)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/regressions/dev10_403582/dev10_403582.il b/src/tests/Loader/classloader/regressions/dev10_403582/dev10_403582.il
index 4c35e56221065f..fcc0ea0c355c0a 100644
--- a/src/tests/Loader/classloader/regressions/dev10_403582/dev10_403582.il
+++ b/src/tests/Loader/classloader/regressions/dev10_403582/dev10_403582.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 //DDB187632: generic types and generic methods with more than 0xFFFF generic arguments should throw a TypeLoadException
 
 .assembly extern mscorlib
@@ -102,6 +103,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       155 (0x9b)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/regressions/dev10_443322/dev10_443322.il b/src/tests/Loader/classloader/regressions/dev10_443322/dev10_443322.il
index 83669b2b2100cb..b8f0544c0c53c7 100644
--- a/src/tests/Loader/classloader/regressions/dev10_443322/dev10_443322.il
+++ b/src/tests/Loader/classloader/regressions/dev10_443322/dev10_443322.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 //
 // Non-virtual call of System.Type.TypeHandle on result of ldtoken should not trigger typeof(XXX).TypeHandle optimization
 //
@@ -65,6 +66,9 @@ static int Main() {
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       62 (0x3e)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/regressions/dev10_493135/dev10_493135.il b/src/tests/Loader/classloader/regressions/dev10_493135/dev10_493135.il
index f394faebb891c3..2793090e7a4a3d 100644
--- a/src/tests/Loader/classloader/regressions/dev10_493135/dev10_493135.il
+++ b/src/tests/Loader/classloader/regressions/dev10_493135/dev10_493135.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.30829.00
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -66,6 +67,9 @@
 {
   .method private hidebysig static int32  Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       15 (0xf)
     .maxstack  1
diff --git a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/MethodCalls.il b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/MethodCalls.il
index 735c168208059e..d4164c196a9d82 100644
--- a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/MethodCalls.il
+++ b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/MethodCalls.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20529.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -356,6 +357,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       375 (0x177)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/RecursiveGen.il b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/RecursiveGen.il
index 42d8a6eea2bd22..dd1f6baaf3e292 100644
--- a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/RecursiveGen.il
+++ b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/RecursiveGen.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20618.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -215,6 +216,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       206 (0xce)
     .maxstack  2
diff --git a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/SealedTypes.il b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/SealedTypes.il
index 0b00f496c0b830..2d8798ef059425 100644
--- a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/SealedTypes.il
+++ b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/SealedTypes.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20528.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -859,6 +860,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       882 (0x372)
     .maxstack  6
diff --git a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance1.il b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance1.il
index 1a8c44f89234db..4683ad354d9a80 100644
--- a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance1.il
+++ b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance1.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20528.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -562,6 +563,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       898 (0x382)
     .maxstack  6
diff --git a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance2.il b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance2.il
index 609705054d45fe..dca99bd67e643c 100644
--- a/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance2.il
+++ b/src/tests/Loader/classloader/regressions/dev10_568786/4_Misc/Variance2.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 4.0.20528.0
 //  Copyright (c) Microsoft Corporation.  All rights reserved.
@@ -790,6 +791,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       898 (0x382)
     .maxstack  6
diff --git a/src/tests/Loader/classloader/regressions/dev10_710121/dev10_710121.il b/src/tests/Loader/classloader/regressions/dev10_710121/dev10_710121.il
index b379d2f662fc91..3f95ba2a650f60 100644
--- a/src/tests/Loader/classloader/regressions/dev10_710121/dev10_710121.il
+++ b/src/tests/Loader/classloader/regressions/dev10_710121/dev10_710121.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 /*BUG: Assert: Precondition failure: FAILED: !ContainsGenericVariables() (vm\method.cpp, Line: 1781)
 
 The bug related to populating MethodDesc slots in generic dictionaries at runtime.
@@ -86,6 +87,9 @@ The bug related to populating MethodDesc slots in generic dictionaries at runtim
 	}
     .method public hidebysig static int32  Main() cil managed
     {
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         .maxstack  3
 
diff --git a/src/tests/Loader/classloader/regressions/dev10_715437/dev10_715437.il b/src/tests/Loader/classloader/regressions/dev10_715437/dev10_715437.il
index de846e7fccc274..7a8cf4ac9706d6 100644
--- a/src/tests/Loader/classloader/regressions/dev10_715437/dev10_715437.il
+++ b/src/tests/Loader/classloader/regressions/dev10_715437/dev10_715437.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 /*
 if there are 3 classes A,B and C, and B inherits from A and C inherits from B, 
 and classes A and B have a public virtual newslot method M(), calling C::M() 
@@ -85,6 +86,9 @@ function call DerivedDerived::Method() since the method is not defined on this t
 
     .method public hidebysig static int32  Main() cil managed
     {
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         .maxstack  10
 
diff --git a/src/tests/Loader/classloader/regressions/dev10_720779/dev10_720779.il b/src/tests/Loader/classloader/regressions/dev10_720779/dev10_720779.il
index 830655c6bd1b69..da4d2520673d44 100644
--- a/src/tests/Loader/classloader/regressions/dev10_720779/dev10_720779.il
+++ b/src/tests/Loader/classloader/regressions/dev10_720779/dev10_720779.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 /*
 We basically have an interface I<T,U>, class Base that implements I<string,int> and class Derived 
 that inherits from Base, and implements I<int,int>. I<T,U> has a method string Method(). 
@@ -109,6 +110,9 @@ where MyClosedDel is:
 	} // end of method Test::CheckResult
     .method public hidebysig static int32  Main() cil managed
     {
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         .maxstack  10
         .locals init (object V_0)
diff --git a/src/tests/Loader/classloader/regressions/dev10_788724/dev10_788724.il b/src/tests/Loader/classloader/regressions/dev10_788724/dev10_788724.il
index 3ac5701667ef5a..0126124a2f2cb9 100644
--- a/src/tests/Loader/classloader/regressions/dev10_788724/dev10_788724.il
+++ b/src/tests/Loader/classloader/regressions/dev10_788724/dev10_788724.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib {}
 .assembly Generated0 {}
 .module Generated0.exe
@@ -188,6 +189,9 @@
 	}
 	.method public hidebysig static int32  Main() cil managed
 	{
+		.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+		    01 00 00 00
+		)
 		.entrypoint
 		.maxstack  10
 		
diff --git a/src/tests/Loader/classloader/regressions/vsw188290/vsw188290.il b/src/tests/Loader/classloader/regressions/vsw188290/vsw188290.il
index d529c8cda5600a..a09708f82940f6 100644
--- a/src/tests/Loader/classloader/regressions/vsw188290/vsw188290.il
+++ b/src/tests/Loader/classloader/regressions/vsw188290/vsw188290.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 
 //  Microsoft (R) .NET Framework IL Disassembler.  Version 2.0.31013.0
 //  Copyright (C) Microsoft Corporation 1998-2003. All rights reserved.
@@ -95,6 +96,9 @@
   .method private hidebysig static int32 
           Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       247 (0xf7)
     .maxstack  5
diff --git a/src/tests/Loader/classloader/regressions/vsw305955/GenericAssert.il b/src/tests/Loader/classloader/regressions/vsw305955/GenericAssert.il
index 3acf4038147d53..f2b447a7d0444b 100644
--- a/src/tests/Loader/classloader/regressions/vsw305955/GenericAssert.il
+++ b/src/tests/Loader/classloader/regressions/vsw305955/GenericAssert.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly extern mscorlib { }
 .assembly GenericAssert
 {
@@ -34,6 +35,9 @@
 {
 	.method public hidebysig static int32 Main() cil managed
 	{
+		.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+		    01 00 00 00
+		)
 		.entrypoint
 		.maxstack 8
 
diff --git a/src/tests/Loader/classloader/rmv/il/RMV-2-15-12b.il b/src/tests/Loader/classloader/rmv/il/RMV-2-15-12b.il
index fef1fe07f0fa84..165e55f3e2007b 100644
--- a/src/tests/Loader/classloader/rmv/il/RMV-2-15-12b.il
+++ b/src/tests/Loader/classloader/rmv/il/RMV-2-15-12b.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Console { }
+.assembly extern xunit.core {}
 .assembly 'RMV-2-15-12'{}
 .assembly extern mscorlib {}
 
@@ -47,6 +48,9 @@
     ret
 }
 .method public static int32 Main(){
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
     .try{
         call void CMain::DeferJitIndirect()
diff --git a/src/tests/Regressions/coreclr/15241/genericcontext.il b/src/tests/Regressions/coreclr/15241/genericcontext.il
index 15290161cae2df..80ce038f4810fb 100644
--- a/src/tests/Regressions/coreclr/15241/genericcontext.il
+++ b/src/tests/Regressions/coreclr/15241/genericcontext.il
@@ -1,4 +1,5 @@
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 
 .assembly extern System.Runtime {  }
 
@@ -58,6 +59,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   ldstr "DefaultImplementationsOfInterfaces"
diff --git a/src/tests/Regressions/coreclr/15647/interfacestatics.il b/src/tests/Regressions/coreclr/15647/interfacestatics.il
index 0ba2f1f6387408..971096939739d2 100644
--- a/src/tests/Regressions/coreclr/15647/interfacestatics.il
+++ b/src/tests/Regressions/coreclr/15647/interfacestatics.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly interfacestatics { }
+.assembly extern xunit.core {}
 
 .assembly extern System.Runtime { }
 
@@ -40,6 +41,9 @@
 
 .method static hidebysig int32 Main()
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   ldsfld class [System.Runtime]System.Type class IFoo<object>::O
diff --git a/src/tests/Regressions/coreclr/15650/interfacecctor.il b/src/tests/Regressions/coreclr/15650/interfacecctor.il
index 4778f369640194..e732f9f121106e 100644
--- a/src/tests/Regressions/coreclr/15650/interfacecctor.il
+++ b/src/tests/Regressions/coreclr/15650/interfacecctor.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly interfacecctor { }
 
 .class interface private abstract auto ansi IFoo
@@ -42,6 +43,9 @@
 .method private hidebysig static int32 
         Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   .maxstack  8
   newobj     instance void Fooer::.ctor()
diff --git a/src/tests/Regressions/coreclr/15827/nonvirtualcall.il b/src/tests/Regressions/coreclr/15827/nonvirtualcall.il
index efaa1de9548d5a..b10cfbcfc1cf2b 100644
--- a/src/tests/Regressions/coreclr/15827/nonvirtualcall.il
+++ b/src/tests/Regressions/coreclr/15827/nonvirtualcall.il
@@ -7,6 +7,7 @@
 //
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 .assembly nonvirtualcall { }
 
@@ -55,6 +56,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   ldstr "DefaultImplementationsOfInterfaces"
diff --git a/src/tests/Regressions/coreclr/16064/methodimpl.il b/src/tests/Regressions/coreclr/16064/methodimpl.il
index 67d79d6b1c21fb..9e7376b44de644 100644
--- a/src/tests/Regressions/coreclr/16064/methodimpl.il
+++ b/src/tests/Regressions/coreclr/16064/methodimpl.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 .assembly methodimpl { }
 
@@ -43,6 +44,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   ldstr "DefaultImplementationsOfInterfaces"
   call bool [System.Runtime]System.Runtime.CompilerServices.RuntimeFeature::IsSupported(string)
diff --git a/src/tests/Regressions/coreclr/16123/ambiguousconstraint.il b/src/tests/Regressions/coreclr/16123/ambiguousconstraint.il
index b50fa0dfd86a8a..62a2f81ec6a424 100644
--- a/src/tests/Regressions/coreclr/16123/ambiguousconstraint.il
+++ b/src/tests/Regressions/coreclr/16123/ambiguousconstraint.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 // TODO: use the contract once this is exposed from contracts
 .assembly extern System.Runtime { }
@@ -69,6 +70,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   .locals init (valuetype Fooer)
   ldloc.0
diff --git a/src/tests/Regressions/coreclr/16354/notimplemented.il b/src/tests/Regressions/coreclr/16354/notimplemented.il
index 7bf524bb9fc589..25697fd90761e6 100644
--- a/src/tests/Regressions/coreclr/16354/notimplemented.il
+++ b/src/tests/Regressions/coreclr/16354/notimplemented.il
@@ -6,6 +6,7 @@
 // (but it actually doesn't) will not be loadable.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 .assembly notimplemented { }
 
@@ -48,6 +49,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   .try
diff --git a/src/tests/Regressions/coreclr/16355/boring.il b/src/tests/Regressions/coreclr/16355/boring.il
index b0e0bceb04935c..aadb0069930ac2 100644
--- a/src/tests/Regressions/coreclr/16355/boring.il
+++ b/src/tests/Regressions/coreclr/16355/boring.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 .assembly boring { }
 
@@ -68,6 +69,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   newobj instance void class Fooer::.ctor()
diff --git a/src/tests/Regressions/coreclr/16355/variance.il b/src/tests/Regressions/coreclr/16355/variance.il
index c2f9f712fb485a..47483c6c9860ad 100644
--- a/src/tests/Regressions/coreclr/16355/variance.il
+++ b/src/tests/Regressions/coreclr/16355/variance.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 .assembly variance { }
 
@@ -39,6 +40,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   .locals (valuetype [System.Runtime]System.RuntimeTypeHandle)
   newobj instance void class Fooer::.ctor()
diff --git a/src/tests/Regressions/coreclr/16775/sharedinterfacemethod.il b/src/tests/Regressions/coreclr/16775/sharedinterfacemethod.il
index 308ead9a37ebf6..f0d52771a526e4 100644
--- a/src/tests/Regressions/coreclr/16775/sharedinterfacemethod.il
+++ b/src/tests/Regressions/coreclr/16775/sharedinterfacemethod.il
@@ -1,4 +1,5 @@
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 .assembly sharedinterfacemethod { }
 
@@ -28,6 +29,9 @@
 
 .method public hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   // Callvirt to a shared interface method
diff --git a/src/tests/Regressions/coreclr/22021/consumer.il b/src/tests/Regressions/coreclr/22021/consumer.il
index 6ee84ed5e19e7a..592db8ae3c45cd 100644
--- a/src/tests/Regressions/coreclr/22021/consumer.il
+++ b/src/tests/Regressions/coreclr/22021/consumer.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 
 .assembly extern provider { }
 
@@ -18,6 +19,9 @@
 {
   .method private hidebysig static int32 Main()
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .locals init (class Test1)
     newobj instance void Test1::.ctor()
diff --git a/src/tests/Regressions/coreclr/22386/debug3.il b/src/tests/Regressions/coreclr/22386/debug3.il
index 7cec9609b5cdb4..74890d63bc558d 100644
--- a/src/tests/Regressions/coreclr/22386/debug3.il
+++ b/src/tests/Regressions/coreclr/22386/debug3.il
@@ -3,6 +3,7 @@
 //
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 .assembly extern System.Console { }
 
 .assembly debug3 { }
@@ -97,6 +98,9 @@
 
 .method private hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   .locals init (class I1 V_0,
              valuetype Test1 V_1,
diff --git a/src/tests/Regressions/coreclr/22407/abstractcalls.il b/src/tests/Regressions/coreclr/22407/abstractcalls.il
index afda4619f9379a..af73050f379d60 100644
--- a/src/tests/Regressions/coreclr/22407/abstractcalls.il
+++ b/src/tests/Regressions/coreclr/22407/abstractcalls.il
@@ -3,6 +3,7 @@
 //
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 
 .assembly abstractcalls { }
 
@@ -79,6 +80,9 @@
 
 .method private hidebysig static int32 Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
 
   .try
diff --git a/src/tests/Regressions/coreclr/22728/createdelegate.il b/src/tests/Regressions/coreclr/22728/createdelegate.il
index 16a2a7994080c5..2c14cc039dc9c3 100644
--- a/src/tests/Regressions/coreclr/22728/createdelegate.il
+++ b/src/tests/Regressions/coreclr/22728/createdelegate.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 .assembly extern System.Console { }
 .assembly createdelegate { }
 
@@ -59,6 +60,9 @@ A_F1_OK:
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     newobj     instance void A::.ctor()
     call       instance int32 A::Test()
diff --git a/src/tests/Regressions/coreclr/22728/debug15.il b/src/tests/Regressions/coreclr/22728/debug15.il
index bcc36d3f68182d..e6b7cc87e1b6df 100644
--- a/src/tests/Regressions/coreclr/22728/debug15.il
+++ b/src/tests/Regressions/coreclr/22728/debug15.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern System.Runtime { }
+.assembly extern xunit.core {}
 .assembly extern System.Console { }
 .assembly debug15 { }
 
@@ -89,6 +90,9 @@ A_F1_OK:
 
   .method private hidebysig static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     newobj     instance void A::.ctor()
     call       instance int32 A::Test()
diff --git a/src/tests/Regressions/coreclr/GitHub_41674/genericldtoken.il b/src/tests/Regressions/coreclr/GitHub_41674/genericldtoken.il
index 245d8b3f973821..79c3f27c37e8d0 100644
--- a/src/tests/Regressions/coreclr/GitHub_41674/genericldtoken.il
+++ b/src/tests/Regressions/coreclr/GitHub_41674/genericldtoken.il
@@ -1,4 +1,5 @@
 .assembly extern System.Runtime {  }
+.assembly extern xunit.core {}
 
 .assembly genericldtoken { }
 
@@ -24,6 +25,9 @@
   .method private hidebysig static int32 
           Main(string[] args) cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       124 (0x7c)
     .maxstack  5
diff --git a/src/tests/baseservices/compilerservices/RuntimeFeature/DefaultImplementationsOfInterfaces.il b/src/tests/baseservices/compilerservices/RuntimeFeature/DefaultImplementationsOfInterfaces.il
index f5f2e7476eaca8..69d58572e5f3e1 100644
--- a/src/tests/baseservices/compilerservices/RuntimeFeature/DefaultImplementationsOfInterfaces.il
+++ b/src/tests/baseservices/compilerservices/RuntimeFeature/DefaultImplementationsOfInterfaces.il
@@ -7,6 +7,7 @@
 // This needs to succeed no matter whether default interfaces are supported.
 //
 .assembly extern mscorlib { auto }
+.assembly extern xunit.core {}
 .assembly extern System.Runtime { auto }
 
 .assembly DefaultImplementationsOfInterfaces{}
@@ -58,6 +59,9 @@
 .method private hidebysig static int32
         Main() cil managed
 {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     .maxstack  2
     ldstr      "DefaultImplementationsOfInterfaces"
diff --git a/src/tests/baseservices/exceptions/generics/try-fault-struct01.il b/src/tests/baseservices/exceptions/generics/try-fault-struct01.il
index 5df821f7ec5893..b9860e063ac201 100644
--- a/src/tests/baseservices/exceptions/generics/try-fault-struct01.il
+++ b/src/tests/baseservices/exceptions/generics/try-fault-struct01.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -323,6 +324,9 @@
 
  .method public hidebysig static int32  Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   // Code size       1032 (0x408)
   .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-fault-struct02.il b/src/tests/baseservices/exceptions/generics/try-fault-struct02.il
index 1fd09ec725a767..4aafe06763cb16 100644
--- a/src/tests/baseservices/exceptions/generics/try-fault-struct02.il
+++ b/src/tests/baseservices/exceptions/generics/try-fault-struct02.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -324,6 +325,9 @@
 
 .method public hidebysig static int32  Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   // Code size       1032 (0x408)
   .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-fault-struct03.il b/src/tests/baseservices/exceptions/generics/try-fault-struct03.il
index 86cd71825427cb..ec986e352cf582 100644
--- a/src/tests/baseservices/exceptions/generics/try-fault-struct03.il
+++ b/src/tests/baseservices/exceptions/generics/try-fault-struct03.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -325,6 +326,9 @@
 
 .method public hidebysig static int32  Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   // Code size       1032 (0x408)
   .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-fault01.il b/src/tests/baseservices/exceptions/generics/try-fault01.il
index 82f8a63f1284d0..1b56de0dc13f0a 100644
--- a/src/tests/baseservices/exceptions/generics/try-fault01.il
+++ b/src/tests/baseservices/exceptions/generics/try-fault01.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -334,6 +335,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       588 (0x24c)
     .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-fault02.il b/src/tests/baseservices/exceptions/generics/try-fault02.il
index 8dfc42559a12f1..e172492d344df8 100644
--- a/src/tests/baseservices/exceptions/generics/try-fault02.il
+++ b/src/tests/baseservices/exceptions/generics/try-fault02.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -334,6 +335,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       588 (0x24c)
     .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-fault03.il b/src/tests/baseservices/exceptions/generics/try-fault03.il
index 36d7b8867a1839..3db16eb608b4c0 100644
--- a/src/tests/baseservices/exceptions/generics/try-fault03.il
+++ b/src/tests/baseservices/exceptions/generics/try-fault03.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -335,6 +336,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       588 (0x24c)
     .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-filter-finally01.il b/src/tests/baseservices/exceptions/generics/try-filter-finally01.il
index 4144496a6094cd..dfc1c5b07b8fd3 100644
--- a/src/tests/baseservices/exceptions/generics/try-filter-finally01.il
+++ b/src/tests/baseservices/exceptions/generics/try-filter-finally01.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -354,6 +355,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       588 (0x24c)
     .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-filter-finally02.il b/src/tests/baseservices/exceptions/generics/try-filter-finally02.il
index 2c296a022cb4fc..fea9c60403281b 100644
--- a/src/tests/baseservices/exceptions/generics/try-filter-finally02.il
+++ b/src/tests/baseservices/exceptions/generics/try-filter-finally02.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -364,6 +365,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       588 (0x24c)
     .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-filter-struct02.il b/src/tests/baseservices/exceptions/generics/try-filter-struct02.il
index e2f438e2122796..8e11b47853c727 100644
--- a/src/tests/baseservices/exceptions/generics/try-filter-struct02.il
+++ b/src/tests/baseservices/exceptions/generics/try-filter-struct02.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -336,6 +337,9 @@
 
 .method public hidebysig static int32  Main() cil managed
 {
+  .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+      01 00 00 00
+  )
   .entrypoint
   // Code size       1032 (0x408)
   .maxstack  2
diff --git a/src/tests/baseservices/exceptions/generics/try-filter02.il b/src/tests/baseservices/exceptions/generics/try-filter02.il
index b846a28890f60e..ce505dc643cabb 100644
--- a/src/tests/baseservices/exceptions/generics/try-filter02.il
+++ b/src/tests/baseservices/exceptions/generics/try-filter02.il
@@ -8,6 +8,7 @@
 
 // Metadata version: v1.1.2211
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -348,6 +349,9 @@
 
   .method public hidebysig static int32  Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
     // Code size       588 (0x24c)
     .maxstack  2
diff --git a/src/tests/baseservices/exceptions/regressions/v1.0/15266.il b/src/tests/baseservices/exceptions/regressions/v1.0/15266.il
index bca20e446bf4ed..74ac7d015abe89 100644
--- a/src/tests/baseservices/exceptions/regressions/v1.0/15266.il
+++ b/src/tests/baseservices/exceptions/regressions/v1.0/15266.il
@@ -5,6 +5,7 @@
 // expect throw System.Security.VerificationException
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -18,6 +19,9 @@
 {
   .method public static int32 Main() cil managed
   {
+    .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+        01 00 00 00
+    )
     .entrypoint
 	
 	.try
diff --git a/src/tests/baseservices/exceptions/simple/fault.il b/src/tests/baseservices/exceptions/simple/fault.il
index 9613d6819b3162..3f3331990c3520 100644
--- a/src/tests/baseservices/exceptions/simple/fault.il
+++ b/src/tests/baseservices/exceptions/simple/fault.il
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -14,6 +15,9 @@
 {
 	.method public static int32 Main(class [mscorlib]System.String[] args) il managed
 	{
+	.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+	    01 00 00 00
+	)
 	.entrypoint
 	.locals init (int32 V_0)
 		ldc.i4	3
diff --git a/src/tests/baseservices/varargs/varargsupport.il b/src/tests/baseservices/varargs/varargsupport.il
index a6a7c4c3940ada..f9eb43b7ad5e84 100644
--- a/src/tests/baseservices/varargs/varargsupport.il
+++ b/src/tests/baseservices/varargs/varargsupport.il
@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 .assembly 'vafilt'
 {
@@ -61,6 +62,9 @@
     
     .method public static int32  Main(class System.String[] args) il managed
     {
+      .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+          01 00 00 00
+      )
       .entrypoint
       .maxstack  3
       .locals ([0] int32 zero)
diff --git a/src/tests/reflection/ldtoken/byrefs.il b/src/tests/reflection/ldtoken/byrefs.il
index 666f34edac81c3..6f6d2ba0c9c5af 100644
--- a/src/tests/reflection/ldtoken/byrefs.il
+++ b/src/tests/reflection/ldtoken/byrefs.il
@@ -8,6 +8,7 @@
 //
 
 .assembly extern mscorlib { }
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
     .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -23,6 +24,9 @@
 {
     .method private hidebysig static int32  Main() cil managed
     {
+        .custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+            01 00 00 00
+        )
         .entrypoint
         .maxstack  2