jikime-workflow-tdd

Test-driven development follows the RED-GREEN-REFACTOR cycle to build software incrementally. You write a failing test first, implement the minimum code to pass it, then refactor while maintaining test coverage and correctness.

TDD structures tests using the AAA (Arrange-Act-Assert) and Given-When-Then patterns to organize test logic clearly. These patterns separate setup, execution, and verification phases to ensure tests remain readable and maintainable.

The FIRST principles of TDD ensure tests are Fast, Independent, Repeatable, Self-validating, and Timely. Following these principles keeps the test suite reliable and ensures it provides immediate, accurate feedback during the development cycle.

Use test doubles in your testing workflow to isolate the code under test by replacing complex dependencies. This ensures unit tests remain fast and focused on a single component within the testing pyramid without triggering external side effects.

Test-driven development does not require specific testing frameworks or external dependencies to implement. The methodology is framework-agnostic, relying on the RED-GREEN-REFACTOR cycle and structural patterns like AAA that can be applied across any software development environment.

Building with tests first enforces a robust testing foundation from the start, unlike traditional workflows where testing is deferred. This approach incrementally validates security and correctness, preventing regressions and reducing downstream debugging effort.