How does intellij do it internally when running all unit tests?
已回答
I wonder if intellij uses 1 thread per class or runs all tests in 1 thread.
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Hello, it depends on the test, but by default it runs in a single thread, that's the general case for JUnit & TestNG.
But you may write your own parallel runner or use provided by JUnit/TestNG:
https://junit.org/junit5/docs/snapshot/user-guide/#writing-tests-parallel-execution
https://testng.org/doc/documentation-main.html#parallel-running
IDEA then would show the output of the parallel running tests. Pls check https://youtrack.jetbrains.com/issue/IDEA-47103, it also has a link for a 3rd party plugin which can help with parallel execution.