juniorUnit Testing
What is Arrange-Act-Assert pattern?
Updated May 6, 2026
Short answer
AAA is a structure for organizing test cases clearly.
Deep explanation
Arrange sets up data, Act executes logic, Assert verifies results. It improves readability and consistency in tests.
Real-world example
Structuring API endpoint tests.
Common mistakes
- Mixing steps without structure.
Follow-up questions
- Why is AAA important?
- Is AAA mandatory?