Editing Test-driven development (section)

=== TDD and ATDD ===
Test-driven development is related to, but different from [[acceptance test–driven development]] (ATDD).<ref>{{cite book |title=Lean-Agile Acceptance Test-Driven Development: Better Software Through Collaboration  |year=2011 |publisher=Addison Wesley Professional |location=Boston |isbn=978-0321714084}}</ref> TDD is primarily a developer's tool to help create well-written unit of code (function, class, or module) that correctly performs a set of operations. ATDD is a communication tool between the customer, developer, and tester to ensure that the requirements are well-defined. TDD requires test automation. ATDD does not, although automation helps with regression testing. Tests used in TDD can often be derived from ATDD tests, since the code units implement some portion of a requirement. ATDD tests should be readable by the customer. TDD tests do not need to be.