VS 2017 RC generating an 0x8000ffff error when trying to debug xUnit tests

Question

I'm trying to debug my .NET Core xUnit tests in VS 2017 RC. I run my tests via the Test Explorer window. While right-clicking a test and selecting Run Selected Tests works fine, selecting Debug Selected Tests does not:

I'm at a loss at how to get past this. I have tried restarting VS, doing a clean build, removing the .vs/ folder, and even updating to a newer build of VS 2017. However, nothing so far has worked. Does anyone have suggestions for how I can work around this? Thanks!

edit: My project has a Git repo here, so if you want to you're free to clone it and see if you can repro for yourself. The test assembly is in src/BasicCompiler.Tests/.

Answer 1

If nothing helps try complete uninstall and reinstall of Visual Studio. Errors in upgrades cause issue sometimes. Ideally IDE should prompt errors and ask you to fix them but I have noticed Visual Studio does not do that; even when you go to updater and reinstall them.

Answer 2

I fixed this by updating Visual Studio 2017 to 15.9.6

Tools -> Extensions and Updates -> Updates.

Answer 3

In my case with Visual Studio 2017 release version the unit test project failed with this error because for some reason the unit test project had a launchsettings.json file under the project "properties" folder. Deleting it resolved the debugging issue.

Answer 4

Try running Visual Studio as an administrator, it might resolve the issue.

In case you don't know how: Right click on the application icon, right click on the applications name and select Run as Administrator.

Answer 5

Restarting vs worked for me...