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Benefits of TDD - Comprehensive Summary

publish date: 2026/06/18 05:45:7.566270 UTC

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Which of the following are documented benefits of test-driven development? Select all that apply.

Regression testing is continuously supported through the accumulated test suite

Tests act as a form of system documentation

Debugging is simplified - when a test fails, the defect must be in the new code

TDD completely eliminates the need for system and acceptance testing

Comprehensive code coverage - every code increment has at least one test

TDD guarantees zero defects in the final system

Correct Answer

(1) Comprehensive code coverage - every code increment has at least one test

(2) Regression testing is continuously supported through the accumulated test suite

(3) Debugging is simplified - when a test fails, the defect must be in the new code

(4) Tests act as a form of system documentation

Explanation

TDD has four key documented benefits: (1) code coverage - all code has tests; (2) regression testing - accumulated tests re-run with each increment; (3) simplified debugging - failures isolated to new code; (4) tests as documentation. TDD does NOT eliminate the need for system/acceptance testing and cannot guarantee zero defects.

Reference

Software Engineering, Ian Sommerville, 10th edition

Quizzes you can take where this question appears

Test-Driven Development - Process and Benefits