TDD & ATDD

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TDD

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TDD Steps

1. Write one unit test. 2. Build or add to the object under test until

everything compiles 3. Red: Watch the test fail! 4. Green: Make all the tests pass by changing

the object under tests. 5. Clean: Refactor mercilessly! 6. Repeat.

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http://www.methodsandtools.com/archive/archive.php?id=72p9

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TDD and ATDD

ATDD Acceptance Test Driven Development • Each test pins down a

business rule.

TDD Test Driven Development • Each test pins down a technical behavior. • Written by developers • For developers • Run frequently by the team • All tests pass 100% before commit and at integration

• Written by the team. • For the team. • Run frequently by the team. • New tests fail until the story is done. Prior tests should all pass.

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