How do you ensure your passing tests(UI automated) actually pass?
As automation engineer I think we should question our passing tests in the same spirit as we dig in our failing tests to find out reasons to fail, at least periodically.
In long standing large automation suites, there are times where a passing test has not been questioned in long time as it was always 'passing' until a direct bug in that area surfaces.
Please share your approach used in actual large projects to test the tests? Preferably through automation.