test-driven-development

To enforce the Red-Green-Refactor cycle, write a failing unit test first, implement minimal production code to pass it, and then refactor. This test-first practice guarantees behavior validation and design clarity.

The best way to refactor legacy code safely is using test-driven development. By writing failing tests that define expected behavior before modifying production code, you ensure your refactoring remains bug-free throughout the process.

Start writing unit tests by defining the feature requirements as a failing test case. Implement the minimal code required to make the test pass, ensuring your new feature is strictly driven by requirements.

Yes, test-driven development works for fixing bugs. You enforce strict adherence to writing a failing test that reproduces the bug before applying the fix, ensuring high-quality software development and behavior validation.

You should reconsider the test-first approach when exploratory prototyping lacks defined behavior requirements. Strict test-driven development requires clear behavior validation goals to guarantee design clarity and avoid writing unnecessary tests.