What does the Pesticide Paradox suggest regarding testing?

The Pesticide Paradox suggests that relying solely on existing tests will not be sufficient to uncover all potential defects in a software product. As software evolves and changes, new defects may be introduced, necessitating the development of new tests that target the modified code and new features. The idea is that while existing tests are useful, they may become ineffective at finding new issues over time, similar to how pests can develop resistance to pesticides. Therefore, to ensure comprehensive testing, it is crucial to devise new tests aimed at discovering important defects that may not be identified by previously established testing methods. This perspective emphasizes the importance of continuous improvement and adaptation in the testing process to address the dynamic nature of software development.