I'm following these steps to build and test parts of the corefx project. Specifically, I'm trying to run tests in Visual Studio 2017 v15.7.6. Running tests on the command line according to those instructions works just fine. When I try to run them in VS 2017 I run into a couple problems. If I follow the directions and set the test project as startup I get the error saying a project with an output type of class library can't be started. The tests show up in test explorer, but if I try to run them from there I get

No test is available in corefx\bin\AnyOS.AnyCPU.Debug\System.Collections.Tests\netcoreapp\System.Collections.Tests.dll. Make sure that test discoverer & executors are registered and platform & framework version settings are appropriate and try again.