test-driven-development

Test-Driven Development (TDD) is a software development practice that improves code reliability by enforcing a strict cycle of writing failing tests before implementation, creating minimal code to pass, and then refactoring. It catches issues early and enhances overall software quality.

To start writing failing tests before implementation, you first define the desired feature behavior in a test script, run it to verify it fails as expected, and then write the minimal implementation code required to make that specific test pass.

Test-Driven Development does not require any specific external dependencies or frameworks. It requires only a basic understanding of TDD principles and general programming knowledge to guide the process of writing tests, implementing code, and refactoring.

TDD is most applicable in software development when working on new features or bug fixes. It guides developers through the test-refactor cycle to ensure code quality, catch issues early, and build confidence in code reliability.

The best way to refactor code after passing tests in TDD is to clean up and optimize the implementation while continuously running the existing tests. This ensures your refactoring efforts do not break the functionality you just verified.

Writing minimal implementation code to pass a test ensures that you only build what is strictly required by the test specifications. This prevents over-engineering, keeps the codebase clean, and maintains high software quality throughout the development process.