test-driven-development

Test-driven development defines expected behavior by writing a failing test first, implementing minimal code to pass it, then refactoring while keeping tests green. This ensures validation before implementation and automates regression detection across features.

To start test-driven development, implement a failing unit test for the specific feature you plan to add, observe the failure, then write just enough production code to make the test pass before refactoring.

Yes, test-driven development is applied during feature development, bug fixes, and refactors across both frontend and backend code to ensure behavior is defined by tests and regressions are detected early.

Writing tests before implementation improves code quality by enforcing a test-first workflow that requires minimal production code to pass failing tests, providing clear documentation of intended behavior and early regression detection.

A strict test-first workflow requires writing a failing test before any production code, which may slow initial feature development but ensures behavior is validated and documented through automated unit tests across the codebase.