Visual Studio - a test with the same identifier already exists

Question

I have a class library project in Visual Studio and validate it (everything is written in C #). After successfully building the solution, VS shows me this window:

I have not seen this before, and I don’t even know where to start: the project compiles without errors and works after compilation, but this window appears after each compilation. When I click Retry or Abort, an error message with the same text appears in the VS output window.

There is only one test method called AddRange1201.

So, the question is how to get rid of this, besides the check "Do not show this dialog box again"?

Answer 1

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