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Test Driven Development (TDD) is an iterative process where tests for a functionality are written before the implementation occurs. This approach promotes quality and maintainability of the code and helps to identify bugs early.
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Test-driven development first writes an automated test for desired behavior, implements the smallest fitting solution, and then improves the code.
TDD was popularized in the 1990s Extreme Programming movement, especially by Kent Beck, as a short red-green-refactor loop. It combines the older idea of automated tests with incremental design.
The test first states an observable contract: red shows the missing behavior, green confirms the smallest solution, and refactor improves structure while behavior stays intact. The test is also a design tool.
Die Folge aus fehlschlagendem Test, minimaler Implementierung und Strukturverbesserung.
Das von außen beobachtbare Ergebnis, das ein Test absichert.
Die schnelle Information, ob eine kleine Änderung den Vertrag einhält.
TDD makes desired behavior testable early and supports small, backward-compatible changes. It guarantees neither good requirements nor system tests; poorly chosen tests can create false confidence.
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