[browser] Fix fingerprinting of relinked dotnet.js during build

src/mono/wasm/Wasm.Build.Tests/Blazor/BuildPublishTests.cs

@@ -64,6 +64,18 @@ public void DefaultTemplate_NoAOT_WithWorkload(string config)
         }
     }
 
+    [Theory]
+    [InlineData("Debug")]
+    [InlineData("Release")]
+    public void DefaultTemplate_BuildAndBuildNative_WithWorkload(string config)
+    {
+        string id = $"blz_buildandbuildnative_{config}_{Path.GetRandomFileName()}";
+
+        CreateBlazorWasmTemplateProject(id);
+
+        BlazorBuild(new BlazorBuildOptions(id, config, NativeFilesType.Relinked), "/p:WasmBuildNative=true");
+    }
+
     // Disabling for now - publish folder can have more than one dotnet*hash*js, and not sure
     // how to pick which one to check, for the test
     //[Theory]

src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs

@@ -19,6 +19,8 @@
 using Xunit.Abstractions;
 using Xunit.Sdk;
 using Microsoft.Playwright;
+using System.Runtime.Serialization.Json;
+using Microsoft.NET.Sdk.WebAssembly;
 
 #nullable enable
 
@@ -834,6 +836,33 @@ protected void AssertBlazorBundle(string config, bool isPublish, bool dotnetWasm
                         dotnetJsPath!,
                         "Expected dotnet.native.js to be same as the runtime pack",
                         same: dotnetWasmFromRuntimePack);
+
+            string bootConfigPath = Path.Combine(binFrameworkDir, "blazor.boot.json");
+            Assert.True(File.Exists(bootConfigPath), $"Missing '{bootConfigPath}'");
+
+            using (var bootConfigContent = File.OpenRead(bootConfigPath))
+            {
+                var bootConfig = ParseBootData(bootConfigContent);
+                foreach (var dotnetJs in bootConfig.resources.runtime.Keys.Where(k => k.StartsWith("dotnet.") && k.EndsWith(".js")))
+                {
+                    Assert.DoesNotContain(dotnetJs, "..");
+
+                    string dotnetJsAbsolutePath = Path.Combine(binFrameworkDir, dotnetJs);
+                    Assert.True(File.Exists(dotnetJsPath), $"Missing '{dotnetJsAbsolutePath}'");
+                }
+            }
+        }
+
+        private static BootJsonData ParseBootData(Stream stream)
+        {
+            stream.Position = 0;
+            var serializer = new DataContractJsonSerializer(
+                typeof(BootJsonData),
+                new DataContractJsonSerializerSettings { UseSimpleDictionaryFormat = true });
+
+            var config = (BootJsonData?)serializer.ReadObject(stream);
+            Assert.NotNull(config);
+            return config;
         }
 
         protected void AssertBlazorBootJson(string config, bool isPublish, bool isNet7AndBelow, string targetFramework = DefaultTargetFrameworkForBlazor, string? binFrameworkDir=null)

src/mono/wasm/Wasm.Build.Tests/Wasm.Build.Tests.csproj

@@ -33,6 +33,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Playwright" Version="1.21.0" />
+    <ProjectReference Include="..\..\..\tasks\Microsoft.NET.Sdk.WebAssembly.Pack.Tasks\Microsoft.NET.Sdk.WebAssembly.Pack.Tasks.csproj" />
     <Compile Include="$(MonoProjectRoot)wasm\debugger\DebuggerTestSuite\BrowserLocator.cs" />
 
     <None Include="$(RepoRoot)\src\mono\wasm\test-main.js" CopyToOutputDirectory="PreserveNewest" />