Error Test framework quit unexpectedly
Answered
How do I solve this problem?

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Check idea.log (https://intellij-support.jetbrains.com/hc/articles/207241085) for errors. If using JUnit 5, see http://junit.org/junit5/docs/current/user-guide/#running-tests-ide-intellij-idea.
Otherwise, please report a bug at https://youtrack.jetbrains.com/issues/IDEA with the logs attached and a small sample project to reproduce the problem.