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TDD Core Process - Identify the Missing Step

publish date: 2026/06/19 10:51:10.994858 UTC

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In TDD, a developer (1) identifies a small functionality increment, (2) writes an automated test, (3) runs the test and it fails, (4) implements the functionality, and (5) re-runs all tests. If all tests now pass, what is the sixth step?

Write documentation for the new feature

Refactor the code to improve its structure without breaking any tests

Delete the test that was just written to keep the test suite lean

Submit the code for peer review before moving to the next increment

Correct Answer

Refactor the code to improve its structure without breaking any tests

Explanation

After all tests pass in a TDD cycle, the developer refactors the code to improve its internal structure and clarity without changing its external behavior. The test suite serves as a safety net during refactoring - any regression introduced will immediately cause a test to fail. Refactoring keeps the codebase clean as it grows incrementally.

Reference

Software Engineering, Ian Sommerville, 10th edition

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