100% Code Coverage Is Useless

Testing is crucial for high-quality software, but 100% code coverage is an unreliable metric for code quality. Code coverage measures how many lines of code are executed but doesn't guarantee that all scenarios or intentions behind the code are tested. High code coverage may lead to neglecting important integration and end-to-end tests, which better simulate how users interact with an application. Instead of focusing on code coverage, developers should aim to test the intent and purpose behind their code, especially for user-critical functionalities.