Why do my tests throw random exceptions when I use the surefire setting parallel=methods ?
Why does SpringJUnit4ClassRunner not work with surefire parallel=methods?
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That's because JUnit creates just one Runner instance per test class, which is used by multiple threads when using
parallel=methods.SpringJUnit4ClassRunnercreates just oneTestContextManager, which stores the test instance in an instance field, so it isn't thread safe.When you use
parallel=classeseverything should be fine, because then JUnit creates one runner with a dedicatedTestContextManagerper thread.I have filed a bug about that: https://jira.spring.io/browse/SPR-12421