TestHost returns the same message (testresult) multiple times for some of the tests. about testing

[rynowak]

This happens what you use [MemberData(...)]. It doesn't seem to cause any issues in VS from what I've seen (VS happily displays pass/fail for each case).

https://github.com/aspnet/Mvc/blob/ae4cafc002c8475d116b3c5c0be75fe9deb2cb11/test/Microsoft.AspNet.Mvc.Core.Test/ViewDataDictionaryTest.cs#L439

Is there any real impact to this that you're aware of? Please reopen if so.

[vijayrkn]

Unit Test framework throws an exception when we try to add the same message (testresult) multiple times.

framework.RecordResult(testResult);
results in error message - "The specified test case was not found in the current result context"

VS Test output log:
Error displaying test result: ViewDataDictionaryTest.Eval_EvaluatesExpressions. The specified test case was not found in the current result context.
Error displaying test result: ViewDataDictionaryTest.Eval_EvaluatesExpressions. The specified test case was not found in the current result context.
Error displaying test result: ViewDataDictionaryTest.CopyConstructors_CopyModelMetadata. The specified test case was not found in the current result context.
Error displaying test result: ViewDataDictionaryTest.CopyConstructors_CopyModelMetadata. The specified test case was not found in the current result context.
Error displaying test result: ViewDataDictionaryTest.CopyConstructors_CopyModelMetadata. The specified test case was not found in the current result context.
Error displaying test result: ViewDataDictionaryTest.CopyConstructors_CopyModelMetadata. The specified test case was not found in the current result context.
Error displaying test result: ViewDataDictionaryTest.SetModelDoesNotThrowOnEnumerableModel. The specified test case was not found in the current result context.

[brentschmaltz]

I think this should be fixed.

1. It confuses users as it is unexpected and they won't know if they made an error.
2. The Output window is cleared out and displays a line starting with: "Error displaying ..."

[vijayrkn]

We can repro this with the current csproj and official non aspnet xunit integration

Error message:
Catastrophic failure: System.Runtime.InteropServices.COMException : The specified test case was not found in the current result context.

[vijayrkn]

Notice VS successfully records 2 testresults for this.

[Eilon]

This is by design. A test can have multiple results, which is the case of xUnit.net Theory tests that use MemberData.