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Intermediate⏱ 6 min read

Regression Testing

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Regression testing ensures that new code changes haven't broken existing functionality. In modern development, every code commit has the potential to introduce regressions — making continuous regression testing a non-negotiable part of delivery.

◈Key Points

  • Regression suites grow over time and must be actively pruned of obsolete or duplicate tests.
  • Prioritise regression tests by risk: features used frequently, features recently changed, and historically buggy areas.
  • Full regression on every commit is impractical — use risk-based, tiered regression strategies.
  • Automated regression testing in CI pipelines is the industry standard.
  • Track regression defect rate over releases — an increasing rate signals deteriorating code quality.
⚡ Expert Pro Tip

Tag tests by component/feature so you can run targeted regression on only the areas affected by a code change. This cuts CI time dramatically without sacrificing coverage.