test-first

Test-driven development involves writing a failing test first, implementing minimal code to pass the test, and continuously refactoring while keeping tests green. This disciplined testing workflow reduces bugs and improves software maintainability.

To write a test case using TDD, you request a template for the specific function, write the failing test first, and then iteratively develop minimal code to pass it. This ensures test design principles guide your software quality assurance process.

Use test-driven development when starting a new feature to reduce bugs and streamline code quality assurance. It fits software engineering contexts where you need disciplined testing, minimal coding to pass tests, and continuous refactoring for maintainability.

The best way to refactor code while keeping tests green is to follow the TDD cycle: write failing tests, implement minimal code to pass, and continuously refactor. This structured workflow maintains software quality throughout development.

Test-driven development supports existing code refactoring by using continuous refactoring within the TDD cycle. You write tests to cover current behavior, implement minimal code to pass, and refactor while keeping tests green to ensure software quality.