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a141db3ad2
* feat(rules,skills): add React Native / Expo rules pack and react-native-patterns skill * fix(rules,skills): address review feedback — safeParse nav example, drop deprecated sentry-expo, memoize list renderItem, clarify New Architecture SDK support * fix(rules,skills): drop deprecated Flipper, surface permission-denied state in location hook
53 lines
1.7 KiB
Markdown
53 lines
1.7 KiB
Markdown
---
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paths:
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- "**/*.ts"
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- "**/*.tsx"
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---
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# React Native / Expo Testing
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> This file extends [common/testing.md](../common/testing.md) with React Native / Expo specific content.
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> Coverage target and TDD workflow are inherited from common/testing.md (80% minimum, RED-GREEN-REFACTOR).
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## Tooling
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| Layer | Tool |
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|-------|------|
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| Unit / component | Jest + `@testing-library/react-native` (via `jest-expo` preset) |
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| Hooks | `@testing-library/react-native` `renderHook` |
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| E2E | Maestro (recommended, simple YAML flows) or Detox |
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| Type safety | `tsc --noEmit` in CI |
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## Component Tests
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- Query by accessible role/label/text, not by `testID` unless necessary — this also enforces accessibility.
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- Assert on user-visible behavior, not implementation details.
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- Follow Arrange-Act-Assert.
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```tsx
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import { render, screen, fireEvent } from '@testing-library/react-native'
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test('calls onSelect with the user id when pressed', () => {
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const onSelect = jest.fn()
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render(<UserCard user={{ id: '1', email: 'a@b.com' }} onSelect={onSelect} />)
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fireEvent.press(screen.getByText('a@b.com'))
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expect(onSelect).toHaveBeenCalledWith('1')
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})
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```
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## Mocking
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- Mock Expo SDK modules (camera, location, notifications, secure-store) at the test boundary.
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- Wrap components that use TanStack Query in a `QueryClientProvider` with a fresh client per test.
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- Mock navigation (`expo-router`) so screens render in isolation.
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## E2E
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- Cover critical flows only: auth, primary navigation, core transactions.
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- Run E2E on CI against a built app (EAS Build) before release.
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## What to test first
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Use the `tdd-guide` agent proactively for new features: write a failing test that captures the behavior, then implement.
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