testing-patterns

The AAA pattern structures unit tests into Arrange, Act, and Assert phases to ensure clarity and isolation. It separates test setup from execution and verification, making your tests easier to read and maintain over time.

The test pyramid structures your test suite by prioritizing a large base of unit tests, fewer integration tests, and minimal end-to-end tests. This distribution optimizes execution speed and ensures efficient, maintainable test coverage for your software.

Mocking best practices involve isolating external dependencies without over-mocking internal logic. You should mock boundaries like external APIs or databases to keep tests fast and reliable while ensuring your critical business logic is tested directly.

Test coverage analysis identifies untested code paths by measuring executed statements during test runs. Use coverage metrics to find gaps in your unit and integration tests, ensuring critical logic is verified without chasing arbitrary percentage targets.

Common testing anti-patterns include over-mocking internal components, writing brittle tests tightly coupled to implementation details, and ignoring the test pyramid distribution. Avoiding these ensures your tests remain robust, maintainable, and resilient to refactoring.