java - Why does SpringJUnit4ClassRunner not work with surefire parallel=methods? -

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why tests throw random exceptions when use surefire setting parallel=methods ?

that's because junit creates 1 runner instance per test class, used multiple threads when using parallel=methods. springjunit4classrunner creates 1 testcontextmanager, stores test instance in instance field, isn't thread safe.

when use parallel=classes should fine, because junit creates 1 runner dedicated testcontextmanager per thread.

i have filed bug that: https://jira.spring.io/browse/spr-12421


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