aaa-pattern

What problem does it solve?

Tests often mix Arrange, Act, and Assert, making failures hard to diagnose and refactors risky. The AAA pattern enforces a clear, repeatable structure that isolates setup, action, and verification.

Core Features & Use Cases

• Clear separation of test phases to improve readability and maintainability.
• Guided refactoring by identifying when actions or assertions are intertwined.
• Cross-framework applicability across popular testing frameworks (e.g., Jest, Mocha, PyTest) to standardize test quality.
• Use Case: When a test contains multiple actions and assertions, convert it into distinct AAA sections to reduce cognitive load and speed debugging.

Quick Start

To start using AAA pattern in your tests, restructure an existing test by placing setup code under Arrange, the operation under Act, and the expected results under Assert, then rename the test to reflect the behavior being verified.