Abstract
While both acceptance-test-driven development (ATDD) and test-driven development (TDD) are methodologies that advocate writing the tests before the code, ATDD (or BDD) is usually considered to lend itself better to bigger test scopes and to scenarios that describe how the users use the system, while TDD is considered to lend itself more specifically to unit tests, which uses the smallest test scope (of a single class or even a method), and therefore tests more technical details. For that reason, unit tests and TDD are considered practices that are done directly by the same developer that implements the code under test (CUT). While toward the end of this chapter we’ll question the distinction between TDD and ATDD, we first need to understand more about unit tests and TDD in general.
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