testing-patterns
Jest testing patterns, factory functions, and TDD workflows for unit test development.
- Covers TDD red-green-refactor cycle, behavior-driven testing focused on public APIs, and factory pattern for reusable test data and component props
- Provides custom render utilities, mock strategies for modules and GraphQL hooks, and structured test organization with describe blocks
- Includes query patterns (getBy, queryBy, findBy), user interaction simulation with fireEvent, and anti-patterns to avoid like testing mock behavior instead of real behavior
- Best practices emphasize factory functions, descriptive test names, clearing mocks between tests, and keeping tests focused on single behaviors
Testing Patterns and Utilities
Testing Philosophy
Test-Driven Development (TDD):
- Write failing test FIRST
- Implement minimal code to pass
- Refactor after green
- Never write production code without a failing test
Behavior-Driven Testing:
- Test behavior, not implementation
- Focus on public APIs and business requirements
- Avoid testing implementation details
- Use descriptive test names that describe behavior
Factory Pattern:
- Create
getMockX(overrides?: Partial<X>)functions - Provide sensible defaults
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