test-driven-development

To write unit tests before implementing a feature, request a failing test that captures the desired behavior, then implement the smallest code change required to make it pass. This test-first workflow ensures safe incremental implementation.

The best way to prevent regressions during refactoring is to establish clear acceptance criteria through behavior-focused unit tests first. By keeping tests focused on real behavior rather than mock internals, you ensure safe incremental implementation and regression prevention.

Fixing a bug using test-driven development involves writing a failing unit test that reproduces the exact input validation issue or behavior change. You then implement the smallest passing change to fix the bug without testing mock internals.

Unit tests break during refactoring when they test mock internals instead of real behavior. By keeping tests focused on actual software behavior and clear acceptance criteria, your test suite remains resilient and supports safe incremental implementation.

Yes, test-driven development supports behavior changes by enforcing behavior-focused testing. You write clear tests for the expected behavior changes without testing mock internals, ensuring your unit tests validate real software functionality rather than implementation details.