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How Does Regression Testing Ensure consistent behavior after every change?

Regression testing is a quality assurance practice that verifies existing functionality continues to work correctly after software modifications. Each update, no matter how small, can introduce unexpected effects in other parts of the system, and regression testing helps uncover these issues early.

This type of testing is especially valuable in environments with frequent releases and continuous integration. By regularly executing a set of trusted test cases, teams can quickly confirm that critical user flows, integrations, and business rules remain intact.

Regression testing is often most effective when supported by automation, allowing tests to be executed repeatedly with minimal effort. At the same time, selective manual regression testing remains important for complex scenarios that require human judgment.

Overall, regression testing provides stability and confidence, enabling teams to evolve their software while preserving the reliability users depend on.