Too Long; Didn't Read
Test cases are meant to check the health of the system and find issues if certain part of the system is not working as expected. Although this seems pretty obvious and trivial but in practice it’s still something engineering teams struggle to achieve with ease. There would be scenarios when the tests succeed but system is not healthy and similarly failing tests do not always reflect a problem in the system. Although all tests are mostly written with good intent, all of them don’t turn out to be good one. Many of them actually becomes useless over a period of time.