Regression Testing: What it is, why it matters, and how to automate it with CI/CD

Regression testing is a crucial practice in software development that involves re-running existing tests after code changes to ensure previously functioning features remain intact. In CI/CD pipelines, regression tests automatically occur with every commit, providing immediate feedback and preventing bugs from reaching production. The text explains the difference between regression testing and retesting, emphasizing that regression testing is broader and checks for any new problems introduced by code changes. It discusses various types of regression testing, including corrective, progressive, selective, complete, unit, and visual regression testing, each with specific purposes and applications. Implementing a robust regression testing strategy involves organizing the test suite for pipeline execution, structuring the pipeline in stages to manage test execution efficiently, and maintaining fast test run times through parallel execution. The text underscores the importance of automating regression testing within a CI/CD pipeline to ensure consistency and reliability, while also recognizing the limitations of automation in areas requiring human judgment. Best practices include running tests on every commit, prioritizing tests by risk, treating flaky tests as bugs, and ensuring tests are versioned with the code. The goal is to create a fast, reliable, and consistent regression testing process that integrates seamlessly into the development workflow, enabling teams to move quickly without compromising software quality.

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