IntelliJ - Failed to start: 0 passed, 1 not started

I've created a ticket for IntelliJ IDEA, you can vote for it if you still encounter this problem.

The issue for me is Failed to start: 1, passed: 0 . I'm using Spring Boot 2.4.0 with Junit5 to test the Controller Class. I just commented out the version tag in the junit-jupiter-engine dependency. Then it worked. Really strange. It might helpful for someone.

I got the same error. It was something weird sent to System.out that made IntellJ IDEA test "not started".