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TDD Process Cycle

publish date: 2026/06/18 05:45:5.216082 UTC

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The TDD cycle consists of five steps. Arrange them in the correct order.

Identify new functionality Write test Run test Implement functionality and refactor fail pass
Run the test - it should fail since the functionality is not yet implemented
Write an automated test for the new functionality
Identify the functionality increment to be implemented
Refactor code to improve structure and clarity once all tests pass
Implement the functionality and re-run all tests

Correct Answer

(1) Identify the functionality increment to be implemented
(2) Write an automated test for the new functionality
(3) Run the test - it should fail since the functionality is not yet implemented
(4) Implement the functionality and re-run all tests
(5) Refactor code to improve structure and clarity once all tests pass

Explanation

The five-step TDD cycle is: (1) Identify the small functionality increment to implement; (2) Write an automated test for it; (3) Run the test - it must fail initially (confirming the test works and the feature doesn't exist yet); (4) Implement the feature and re-run all tests until they pass; (5) Refactor the code to improve its structure without breaking any tests.

Reference

Software Engineering, Ian Sommerville, 10th edition

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