Testing ensures software works as intended before reaching users. Different testing approaches catch different types of issues, and comprehensive testing is essential for quality software.
Unit tests verify individual components work correctly in isolation. They’re fast to run and help developers catch bugs early in the development process. Well-written unit tests also document how code should behave.
Integration tests ensure different parts of the system work together properly. While unit tests check individual pieces, integration tests verify that combined components function correctly as a whole.