test-driven-development

Test-driven development (TDD) is a software engineering process where you write a failing test, implement minimal code to pass it, and then refactor. This red-green-refactor cycle ensures tests drive implementation and reduces regressions across changes.

To fix bugs using test-driven development, start by writing a failing test that reproduces the specific bug. Then, implement the minimal code required to make the test pass, ensuring the bug is resolved and preventing future regressions.

Yes, test-driven development applies to feature development and bug fixes across languages. It guides developers through writing failing tests and iterating until all tests pass, promoting maintainable, well-tested software regardless of language.

The best way to start writing unit tests for reliable code is to write a failing test first. Implement the minimal code to make it pass, then refactor the implementation while ensuring the test continues to pass.

Test-driven development makes code more reliable by requiring tests before writing implementation. This approach guides software design, improves confidence in future refactors, and provides clear documentation of intended behavior compared to writing tests afterward.

Test-driven development requires strict adherence to the red-green-refactor workflow, which may not suit exploratory prototyping where design is highly volatile. If immediate delivery of untested code is prioritized over long-term maintainability and regression reduction, TDD may not fit.