code-showcase-testing-patterns

npx skills add sickn33/agentic-awesome-skills --skill code-showcase-testing-patterns --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# Testing Patterns and Utilities ## When to Use Use this skill when you need jest testing patterns, factory functions, mocking strategies, and TDD workflow. Use when writing unit tests, creating test factories, or following TDD red-green-refactor cycle. ## 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 - Allow overriding specific properties - Keep tests DRY and maintainable ## Test Utilities ### Custom Render Function Create a custom render that wraps components with required providers: ```typescript // src/utils/testUtils.tsx import { render } from '@testing-library/react-native'; import { ThemeProvider } from './theme'; export const renderWithTheme = (ui: React.ReactElement) => { return render( <ThemeProvider>{ui}</ThemeProvider> ); }; `

Run all tests
npm test
Run with coverage
npm run test:coverage
Run specific file
npm test ComponentName.test.tsx