Visual Studio Code - .NET Core Test Explorer

I am trying to run tests through .NET Core Test Explorer plugin for Visual Studio Code. I have a folder with all my code in it, including source code for the project AND the test code. The Test Explorer doesn't find the tests, and i've set the: "dotnet-test-explorer.testProjectPath" setting to the actual folder, but still nothing.

Any ideas on how to get the VSC's Core Test Explorer to actually find my tests? These are all *.cs files. thanks