Regression Testing VS Unit Testing: What is the Difference?

Unit testing and regression testing both play crucial roles in ensuring software quality, albeit with different focuses and timings within the software development lifecycle. Unit testing is concerned with verifying the functionality of individual components or blocks of code, often performed by developers or specialized engineers during the development phase to ensure technical and functional correctness. It emphasizes testing in isolation without relying on user interfaces, often using automated frameworks such as JUnit or pytest, and serves as a foundation for regression testing. Regression testing, conducted after updates or modifications, ensures that the entire application continues to function as expected, preventing previously working features from breaking. This testing type often involves broader automation tools like Selenium or TestComplete and is crucial for maintaining application stability after changes. Together, these testing methods form a comprehensive safety net that helps developers detect issues early, ensuring a seamless user experience and software reliability. By integrating unit tests into regression test suites and leveraging CI/CD pipelines, teams achieve faster feedback loops and a more efficient development process, ultimately delivering high-quality software in dynamic environments.