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I was able to run single test in IDE, but now I get an error: `No tests were found"

What should I do to run single test like before?

You should run tests via gradle runner, not intellij runner
Please check those settings

Also don't forget to remove incorrect run configuration

Ah... The problem was disappeared after I switch to `Intellij IDEA Ultimate`, so I guess it was some kind IDE settings problem. But somehow the problem comes back even in `IDEA Ultimate`  recently, I've thought about it for some time, still have no clue...

The setting looks like correct, but once I run/debug the test, IDE create a Junit run/debug configuration instead of a Gradle one.

It's very strange
Did you change something in `gradle.properties` or `local.properties`?

Also did you try to reimport the project?
It helps with a lot of configuration problems