testing-setup-react-native

Render the component with render(), query elements using semantic queries like getByRole or getByText, and simulate interactions with fireEvent.press or fireEvent.changeText. Follow the Arrange-Act-Assert pattern and clear mocks in beforeEach.

Mock expo-router with jest.mock, providing jest.fn() implementations for useRouter and useLocalSearchParams, and pass-through components for Stack and Tabs. Return push, back, and replace mocks from useRouter to assert navigation calls.

jest.clearAllMocks() only clears call history, not mock implementations, so stale mockResolvedValue state leaks between tests. Reset every mock implementation to clean defaults in beforeEach to restore isolation.

Yes, use waitFor to wait for assertions or findBy queries that automatically wait for elements to appear after async operations. You can pass a custom timeout option to waitFor for slow operations.

Use getByTestId only as a last resort when semantic queries like getByRole, getByLabelText, getByPlaceholderText, and getByText cannot locate the element. Semantic queries are preferred because they reflect accessibility behavior.