testing-patterns skillA

testing-patterns is agent-read markdown (skill) from kunanonj/ai-skills-hub: 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..

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# 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
- 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>
  );
};
```

**Usage:**
```typescript
import { renderWithTheme } from 'utils/testUtils';
import { screen } from '@testing-library/react-native';

it('should render component', () => {
…

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