test-driven-development

The red-green-refactor cycle in test-driven development is an incremental workflow where you write a failing test, implement minimal code to pass it, and then refactor for clarity. This disciplined approach reduces bugs and guides software design decisions early.

To write tests first for a new software feature, start by creating a failing test that captures the intended behavior. Next, implement the minimal production code required to make that test pass, and finally refactor the code to improve clarity while maintaining test coverage.

Yes, you can use test-driven development for bug fixes and refactoring across typical software projects. Applying test-first workflows to these tasks maintains code quality and provides early regression protection through automated tests that validate intended behavior.

Test-driven development improves software maintainability and quality assurance by enforcing automated test coverage before production code is written. This process captures intended behavior early, preventing regressions and ensuring verifiable progress during feature development and refactoring.

You should reconsider a test-first workflow for software testing when dealing with exploratory spikes or throwaway prototypes where rapid iteration matters more than immediate regression protection. The overhead of writing failing tests first may not suit highly volatile, undefined requirements.