Visual Studio's Test Explorer was not showing the icons that indicate whether tests passed or failed. There were additional problems.
I'd tried rebuilding the solution, reinstalling Visual Studio, as well as rebooting the machine.
I deleted the .vs directory under the solution. The files were corrupt and I could not delete through Windows Explorer. I booted into safe mode command prompt and still could not delete the files. Running chkdsk /f found and fixed a few issues. Now I was able to delete the files in the .vs directory, boot into a normal Windows session and confirm the fix worked.
I hope this helped you fix a similar problem!
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