test-driven-development

Test-driven development prevents code regressions by forcing tests to define and verify expected behavior before implementation. It prescribes a test-first mindset and automated verification to ensure reliable, maintainable code.

Use the Prove-It Pattern in test-driven development to write a failing test that reproduces the specific defect first. Once the bug is reproduced, you implement the fix to make the test pass, ensuring the bug is safely resolved without regressions.

Yes, test-driven development supports safe refactoring for codebases of varying sizes. By validating behavior through automated tests after each incremental change, it provides guardrails that prevent regressions during structural improvements.

To start a test-first workflow, write a failing unit test that demonstrates the desired behavior. Then, implement the minimal code required to make that test pass, driving your development process through verification.

Test-driven development improves design and documentation by creating test suites that express intent and expected outcomes. The tests themselves serve as executable specifications, clarifying how the codebase should behave.