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Arrange/Act/Assert

Testing Idiom

Also known as

Given/When/Then

Intent

The Arrange/Act/Assert (AAA) is a pattern for organizing unit tests. It breaks tests down into three clear and distinct steps: 1. Arrange: Perform the setup and initialization required for the test. 2. Act: Take action(s) required for the test. 3. Assert: Verify the outcome(s) of the test.

Applicability

Use Arrange/Act/Assert pattern when

  • you need to structure your unit tests so they're easier to read, maintain, and enhance.

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