react-native-testing
Test React Native components with Jest and React Native Testing Library. Use when writing Jest or React Native Testing Library tests for React Native components.
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Static analysis is a first line of defense, not a guarantee. Read the source
SKILL.md
React Native Testing
Priority: P1 (HIGH)
Core Rule Anchors
[MOB-TEST-01]Tripartite Naming: FollowMethod_Scenario_ExpectedBehavior.[MOB-TEST-02]State & Component Invariant Rule: Assert on visible user outcomes and accessible UI elements; never inspect component internal state or props directly.[MOB-TEST-03]Entity Invariant Rule: Test calculations, validations, and domain invariants; ban trivial echo assertions.[MOB-TEST-04]Contract Testing Rule: Intercept network requests at HTTP boundary (MSW) or native module boundary; ban 1:1 pass-through mock echoing without contract assertions.[MOB-TEST-05]Bug-First Regression Lock: Every PR resolving a bug ticket or with titlefix(...)must introduce a test reproducing the defect prior to the fix.
Setup & Component Testing
- Jest & RNTL: Use
@testing-library/react-nativefor user-centric tests. Mock native modules withjest.mock(). - Component Example:
test('increments counter on button press', () => {
const { getByText, getByRole } = render(<Counter />);
fireEvent.press(getByRole('button', { name: /increment/i }));
expect(getByText('Count: 1')).toBeTruthy();
});
Best Practices
- User-Centric: Use
getByRole,getByTextovertestID. UsefindBy*for async elements. - Integration > Unit: Test features, not implementation. Avoid brittle snapshots.
- Coverage: Coverage is diagnostic and project-configured; verify risk-weighted critical paths rather than padding code for an arbitrary percentage.
Anti-Patterns
- No Testing Implementation: Test behavior, not internals. Avoid
testIDoveruse. - Banned Smells: Ban vague names, inspecting component state/props, echo assertions, and pass-through mocks.
References
See references/testing-library.md for RNTL setup, mocking providers, and integration flow examples.
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
-
Integration
-
RNTL
-
Additional task-grounded exact anchors: test behavior
Files
3- SKILL.md
32de983f2a2.5 KB - evals/evals.json
4bbd7657ed2.6 KB - references/testing-library.md
e150d99d971.9 KB
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