improve error message

Test.LightweightIocContainer.Validation/IocValidatorTest.cs

@@ -150,13 +150,13 @@ public class IocValidatorTest
 
         if (aggregateException?.InnerExceptions[0] is not NoMatchingConstructorFoundException noMatchingConstructorFoundException)
         {
-            Assert.Fail("inner exception is not of type NoMatchingConstructorFoundException");
+            Assert.Fail($"{nameof(aggregateException.InnerExceptions)} is not of type {nameof(NoMatchingConstructorFoundException)}");
             return;
         }
             
         if (noMatchingConstructorFoundException.InnerExceptions[0] is not ConstructorNotMatchingException iTest2CtorNotMatchingException)
         {
-            Assert.Fail("inner exception is not of type ConstructorNotMatchingException");
+            Assert.Fail($"{nameof(aggregateException.InnerExceptions)} is not of type {nameof(ConstructorNotMatchingException)}");
             return;
         }
             
@@ -182,6 +182,6 @@ public class IocValidatorTest
         if (exception is NoMatchingConstructorFoundException noMatchingConstructorFoundException)
             Assert.AreEqual(typeof(T), noMatchingConstructorFoundException.Type);
         else
-            Assert.Fail($"Exception is no NoMatchingConstructorFoundException, actual type: {exception?.GetType()}");
+            Assert.Fail($"Exception is no {nameof(NoMatchingConstructorFoundException)}, actual type: {exception?.GetType()}");
     }
 }