test-driven-development

Test-driven development implements features by writing a failing test first, then developing minimal production code to pass the test, and finally refactoring. This ensures the code reliably meets the expected behavior requirements.

Fixing bugs using TDD involves writing a failing test that reproduces the specific bug, then writing or modifying minimal code to pass the test. This approach ensures the bug is correctly verified and prevents future regressions.

The Red-Green-Refactor cycle starts by writing a failing test, implementing minimal code to make the test pass, and then refactoring the code. This structured workflow improves software quality and reliability throughout feature implementation.

Test-driven development is applicable to any software development project aiming to improve code quality. It does not require specific dependencies or environments, making it suitable for diverse feature implementation and bug fixing scenarios.

Writing failing tests before production code ensures that only the necessary minimal code is written to achieve the desired behavior. This test-first approach verifies that the test correctly checks the expected outcome and builds confidence in the implementation.

Test-driven development may not suit exploratory programming or throwaway prototypes where immediate behavior verification is unnecessary. Because it enforces a strict test-first cycle, it requires clearly defined expected behaviors before any production code is written.