Skill: Testing Unit

Goal

Write fast, focused unit tests for individual functions, classes, and modules with proper isolation and mocking.

Use This Skill When

• Testing a single function or class
• Testing pure functions with no side effects
• Testing utility functions and helpers
• Adding tests to existing code
• The user asks for "unit tests" for specific code

Do Not Use This Skill When

• Testing multiple components together (use integration tests)
• Testing user flows or complete features (use E2E tests)
• Database or network calls are involved (mock or use integration tests)

Unit Test Structure