test-writer

When to use this skill

Use this skill whenever the user wants to:

• Write unit tests for functions, classes, or modules
• Create integration tests for API endpoints or database interactions
• Build end-to-end tests for user workflows
• Add test coverage for edge cases and error paths
• Set up a testing framework (pytest, Jest, JUnit, Vitest, Playwright)
• Generate test fixtures and mock data

How to use this skill

Workflow

1. Identify the code under test - Read the function/class/module to understand its behavior
2. Choose the test type - Unit (isolated), integration (multi-component), or E2E (full flow)
3. Write tests using AAA pattern - Arrange inputs, Act on the function, Assert expected results
4. Cover edge cases - Empty inputs, boundary values, error conditions, concurrent access