VS2017 and NUnit 3.9 No test is available

Can you check the following steps and see if it works?

In the Visual Studio menu, go to Test > Test Settings > Default Processor Architecture and make a note if X86 is selected or X64
Now go to the Build section in the Properties window of the project where the tests are written. Make sure the Platform target drop-down is selected to either Any CPU or at least it matches the architecture from the above step 1.

Now if you build the solution and try running those tests, you should see that they are now running.

I had the same problem as Amete Blessed and commenting out other Test methods made Test Explorer work and run my test

I found that my Build Events were wrong. Invalid copy command blew all my tests and half a day:

Copy C:\repo\Architecture\*.json $(ProjectPath)/Y
Copy C:\repo\Architecture\*.json $(TargetPath) /Y

instead of

Copy C:\repo\Architecture\*.json $(ProjectDir)/Y
Copy C:\repo\Architecture\*.json $(TargetDir) /Y

Make sure you have installed the NUnit3 Test Adapter from here

https://marketplace.visualstudio.com/items?itemName=NUnitDevelopers.NUnit3TestAdapter

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