test-driven-development

Test-driven development is a workflow where you write a failing test first, implement minimal code to pass it, and then refactor. The Red-Green-Refactor loop enforces this cycle to validate design and clean up code.

To start writing a failing test, define the desired behavior first, then implement the minimal production code required to make that test pass. This test-first approach clarifies intent and prevents wasted work.

Yes, test-driven development applies to bug fixes, refactoring, and behavior changes in collaborative settings. Writing tests first guides implementation with proven expectations and promotes disciplined team development.

Writing tests first improves code quality by defining expected behavior upfront, which reduces wasted work. It speeds up debugging by catching regressions early through verifiable production code driven by tests.

You should reconsider a test-first workflow when exploring highly experimental code where behavior is undefined. Test-driven development requires clear expected behavior to write a meaningful failing test before implementation.

The best way to maintain minimal production code during unit testing is to follow the Red-Green-Refactor loop strictly: write a failing test, code only enough to pass it, and then clean up the implementation.