test-driven-development

Test-driven development improves software quality by enforcing a failing test before implementation, ensuring behavior is validated upfront, reducing bugs, and enabling safer refactoring through immediate feedback.

To start a Red-Green-Refactor workflow, write a failing test for the desired behavior, implement the minimal code required to pass that test, then refactor the code for clarity and improved design.

Test-driven development works for bug fixes and refactoring by requiring a test that reproduces the bug or validates existing behavior first, guaranteeing test coverage and lowering regression risk during cleanup.

The best way to ensure a tests-first methodology across languages is applying a strict Red-Green-Refactor cycle, mandating failing tests for every change before writing minimal implementation code to pass them.

Writing a failing test before coding implementation logic ensures you validate desired behavior upfront, encourages incremental design, enables faster debugging, and confirms the test actually checks the feature.