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TDD Test Suite as a Safety Net

publish date: 2026/06/19 10:09:35.283919 UTC

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How does the accumulated TDD test suite function as a safety net during ongoing development?

It creates formal proof that the system is defect-free before each release

It provides immediate feedback when any code change breaks previously working functionality

It prevents developers from committing code to the repository without manager approval

It generates automatic rollback of code if more than 10% of tests fail

Correct Answer

It provides immediate feedback when any code change breaks previously working functionality

Explanation

The growing TDD test suite acts as a regression safety net. Whenever a developer makes a code change - whether adding a feature, fixing a bug, or refactoring - re-running the entire test suite immediately reveals if anything previously working has been broken. This rapid feedback loop is one of the most practical advantages of TDD in ongoing development.

Reference

Software Engineering, Ian Sommerville, 10th edition

Quizzes you can take where this question appears

Test-Driven Development - Limitations and Context