Overview

This skill provides strategies for test design, test coverage, test organization, and testing best practices across different testing types and frameworks.

Test Coverage Targets

• Critical Code (auth, payment, security): 100%
• Business Logic: 90-100%
• Utilities: 80-90%
• UI Components: 70-80%
• Overall Project: 80%+

Test Types

Unit Tests

• Test individual functions/methods in isolation
• Use mocks for dependencies
• Fast execution (<1ms per test)
• Cover happy path, edge cases, errors

Integration Tests

• Test component interactions
• Use real dependencies where reasonable
• Test API endpoints, database operations
• Moderate execution time

End-to-End Tests

• Test complete user workflows
• Use real system components
• Critical paths only (slower execution)

Test Case Pattern

For each function, create tests for:

1. Happy Path: Normal, expected inputs
2. Edge Cases: Boundary values, empty inputs
3. Error Cases: Invalid inputs, exceptions
4. Special Cases: Nulls, zeros, large values

Test Organization

tests/
├── unit/
│   ├── test_module1.py
│   └── test_module2.py
├── integration/
│   └── test_api.py
└── e2e/
    └── test_workflows.py

When to Apply

Use when creating test suites, improving coverage, fixing failing tests, or designing test strategies.