Your suite passes on one thread and fails on four. The four bugs parallel Selenium exposes in Java, the ThreadLocal fix done right, and an audit checklist.
Your suite is green. Someone sets thread-count="4" to get CI under ten minutes, and now
three tests fail. Re-run: two fail, and not the same two. Run it locally and everything
passes.
That's not flakiness in your application. That's your test framework being unsafe under
concurrency, and it was unsafe the whole time — one thread was just hiding it.
A suite that passes sequentially can fail the moment you enable parallel execution. Elements...
Case Study: The Thread Pool Passed 64/64 Tasks. ThreadSanitizer Found the Race in the...
A flaky Selenium test is one that passes and fails inconsistently without any change to the code...
Testing at the right level with JUnit 5 and Mockito, covering the unhappy path with parameterized tests, avoiding over-mocking,…
The failure starts small A test that passes 200 times and fails once does not feel urgent....
Frontend test automation rarely fails because a team picked the “wrong” framework. It usually fails...
