Visual Studio 2022 17.12.4 can't connect test runner process

Question

After upgrading visual studio 2022 to 17.12.4, for .net 8 test project which is using MSTest and Xunit at same time, it always fails to execute tests from test explorer. The error message is like below:

"Unable to connect to testing platform runner process [xxxTests.dll]"

If turn off the preview feature flag, test can be executed from test explorer again.

Is there a bug in the preview feature?

Answer 1

Hi @Shi, Jason (Shanghai) ,

Is there a bug in the preview feature?

It’s possible that this is a potential issue. I noticed that some developers also get the same error, see this Github thread: Unable to connect to testing platform runner process when using testing platform server mode.

I did some tests on my side, changing the project file, using the MSTest and the Xunit test, restarting VS, checking/unchecking the preview feature, but failed to reproduce this issue.

I doubt that this issue appears in some specific situations.

I suggest you follow up that Github ticket, add comments and wait for the latest update.

Thanks for helping us make Visual Studio better.

Have a great day!

Tianyu

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