Improve test failure reporting of EpollSocketChannelConfigTest #11570
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Motivation:
This test is inherently flaky due to file descriptor reuse.
Even though we have taken steps to make it less flaky, it still fails sometimes.
When it does, the error message is not very helpful.
Modification:
Make use of assertThrows and assertThat to get more descriptive error messages when the tests fail.
Result:
More meaningful messages on test failures, which may help us make the tests more resilient in the future