Direct answer
What is TDD (Test-Driven Development)?
- Short definition
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TDD is a development approach where you write tests before writing code, then write just enough code to make tests pass—a cycle called Red-Green-Refactor.
- Why it matters
- TDD catches bugs early, ensures tests actually test what matters, and creates a safety net that enables confident refactoring and long-term maintainability.
How teams use TDD (Test-Driven Development)
Use this term when you need to describe the practical role it plays in a software project.
Common use cases
- Writing tests that define expected behavior first
- Ensuring new features don't break existing functionality
- Documenting expected behavior through tests
- Enabling confident refactoring
Examples of TDD (Test-Driven Development)
These examples show the term in everyday product, platform, or operations work.
Real-world examples
- Writing test for user registration before implementing it
- PHPUnit tests verifying API endpoint responses
- Browser tests confirming checkout flow works end-to-end