Test Automation
Test-Driven Development (TDD)
A development approach where you write failing tests first, then write code to make them pass.
Full definition
Test-Driven Development (TDD) is a development methodology where tests are written before the production code. It follows a strict cycle:
Red → Green → Refactor:
- 1.Red: Write a failing test for the desired behavior
- 2.Green: Write the minimum code to make the test pass
- 3.Refactor: Improve the code while keeping tests green
Benefits:
- Forces you to think about requirements before coding
- Builds a comprehensive test suite as you go
- Leads to simpler, more modular designs
- Reduces debugging time
- Gives confidence to refactor
TDD is primarily a developer practice (unit tests), but the concept extends to:
- BDD (Behavior-Driven Development): TDD at the feature level with Given-When-Then
- ATDD (Acceptance Test-Driven Development): Acceptance tests drive feature development
QA engineers benefit from understanding TDD because:
- It changes how you collaborate with developers
- It improves test coverage naturally
- It influences how you write automation tests
- TDD-practicing teams produce fewer bugs