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TDD and Regression Testing

publish date: 2026/06/18 05:45:6.089580 UTC

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How does TDD support regression testing when new features are added to an existing system?

TDD isolates new features in separate modules so they cannot affect existing regression tests

TDD recommends deleting old tests when new features are added to avoid conflicts

As features are developed, a suite of tests accumulates; these are re-run with each new increment to check that nothing has been broken

TDD generates regression test reports automatically and emails them to the development team

Correct Answer

As features are developed, a suite of tests accumulates; these are re-run with each new increment to check that nothing has been broken

Explanation

As new features are developed in TDD, a growing suite of tests accumulates. Each time a new increment is integrated, all previous tests are re-run. This provides a constant regression check - ensuring that new additions have not broken previously working functionality. This is one of TDD's most practical benefits.

Reference

Software Engineering, Ian Sommerville, 10th edition

Quizzes you can take where this question appears

Test-Driven Development - Process and Benefits