test-driven-development

Test-driven development is a test-first workflow where you write a failing test, implement minimal production code to pass it, then refactor. This red-green-refactor cycle enforces correct behavior and reduces regression risk during feature development and bug fixes.

Start writing tests before production code by defining a failing test for the expected behavior, then write the minimal implementation required to pass that test, and finally refactor the code while ensuring the test stays green.

Yes, test-driven development helps with refactoring by providing strong validation. The failing tests define expected behavior, ensuring predictable refactors and reducing regression risk when modifying or extending existing software.

The minimal implementation principle in test-driven development means writing only enough production code to pass the test. This avoids premature optimization and unused implementations, guiding design decisions and maintaining clear boundaries.

You can use test-driven development for both bug fixes and feature additions. It drives behavior-focused workflows by writing failing tests that define the correct behavior, ensuring robust and maintainable code across all development tasks.