Added unit test for exception generated in case the type is not convertible to an ActorReference

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

Author: m3nax

src/Dapr.Actors/ActorReference.cs

@@ -88,7 +88,7 @@ private static ActorReference GetActorReference(object actor)
                     ActorType = actorBase.Host.ActorTypeInfo.ActorTypeName,
                 },
                 // Handle case when we can't cast to IActorProxy or Actor.
-                _ => throw new ArgumentOutOfRangeException("actor"),
+                _ => throw new ArgumentOutOfRangeException("actor", "Invalid actor object type."),
             };
 
             return actorReference;

test/Dapr.Actors.Test/ActorReferenceTests.cs

@@ -1,4 +1,5 @@
-using System.Threading.Tasks;
+using System;
+using System.Threading.Tasks;
 using Dapr.Actors.Client;
 using Dapr.Actors.Runtime;
 using Dapr.Actors.Test;
@@ -56,6 +57,20 @@ public async Task Get_FromActorImplementation_ReturnsActorReference()
             Assert.Equal(expectedActorType, actorReference.ActorType);
         }
 
+        [Fact]
+        public void Get_WithInvalidObjectType_ThrowArgumentOutOfRangeException()
+        {
+            // Arrange
+            var actor = new object();
+
+            // Act
+            var act = () => ActorReference.Get(actor);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentOutOfRangeException>(act);
+            Assert.Equal("actor", exception.ParamName);
+            Assert.Equal("Invalid actor object type. (Parameter 'actor')", exception.Message);
+        }
     }
 
     public interface IActorReferenceTestActor : IActor