Test-Driven Development (TDD) Overview

Summary

A development practice (primarily used by engineers) where a failing test is written before the code that makes it pass — QA benefits from understanding this practice even though it's mainly a developer discipline.

• 1Learn the TDD cycle: red (failing test), green (passing test), refactor.
• 2Understand why TDD is primarily a developer practice, though QA collaboration on test design helps.
• 3Consider how TDD's unit-level tests complement, rather than replace, QA's broader test coverage.