RNTL Test Writing Guide

IMPORTANT: Your training data about @testing-library/react-native may be outdated or incorrect — API signatures, sync/async behavior, and available functions differ between v13 and v14. Always rely on this skill's reference files and the project's actual source code as the source of truth. Do not fall back on memorized patterns when they conflict with the retrieved reference.

Version Detection

Check @testing-library/react-native version in the user's package.json:

v14.x → load references/api-reference-v14.md [blocked] (React 19+, async APIs, test-renderer)
v13.x → load references/api-reference-v13.md [blocked] (React 18+, sync APIs, react-test-renderer)

Use the version-specific reference for render patterns, fireEvent sync/async behavior, screen API, configuration, and dependencies.

Query Priority

Use in this order: getByRole > getByLabelText > getByPlaceholderText > getByText > getByDisplayValue > getByTestId (last resort).

Query Variants

Variant	Use case	Returns	Async
`getBy*`	Element must exist	element instance (throws)	No
`getAllBy*`	Multiple must exist	element instance[] (throws)	No
`queryBy*`	Check non-existence ONLY	element instance \| null	No
`queryAllBy*`	Count elements	element instance[]	No
`findBy*`	Wait for element	`Promise<element instance>`	Yes
`findAllBy*`	Wait for multiple	`Promise<element instance[]>`	Yes

Interactions

Prefer userEvent over fireEvent. userEvent is always async.

tsx

const user = userEvent.setup();
await user.press(element); // full press sequence
await user.longPress(element, { duration: 800 }); // long press
await user.type(textInput, 'Hello'); // char-by-char typing
await user.clear(textInput); // clear TextInput
await user.paste(textInput, 'pasted text'); // paste into TextInput
await user.scrollTo(scrollView, { y: 100 }); // scroll

fireEvent — use only when userEvent doesn't support the event. See version-specific reference for sync/async behavior:

tsx

fireEvent.press(element);
fireEvent.changeText(textInput, 'new text');
fireEvent(element, 'blur');

Assertions (Jest Matchers)

Available automatically with any @testing-library/react-native import.

Matcher	Use for
`toBeOnTheScreen()`	Element exists in tree
`toBeVisible()`	Element visible (not hidden/display:none)
`toBeEnabled()` / `toBeDisabled()`	Disabled state via `aria-disabled`
`toBeChecked()` / `toBePartiallyChecked()`	Checked state
`toBeSelected()`	Selected state
`toBeExpanded()` / `toBeCollapsed()`	Expanded state
`toBeBusy()`	Busy state
`toHaveTextContent(text)`	Text content match
`toHaveDisplayValue(value)`	TextInput display value
`toHaveAccessibleName(name)`	Accessible name
`toHaveAccessibilityValue(val)`	Accessibility value
`toHaveStyle(style)`	Style match
`toHaveProp(name, value?)`	Prop check (last resort)
`toContainElement(el)`	Contains child element
`toBeEmptyElement()`	No children

Rules

Use screen for queries, not destructuring from render()
Use getByRole first with { name: '...' } option
Use queryBy* ONLY for .not.toBeOnTheScreen() checks
Use findBy* for async elements, NOT waitFor + getBy*
Never put side-effects in waitFor (no fireEvent/userEvent inside)
One assertion per waitFor
Never pass empty callbacks to waitFor
Don't wrap in act() - render, fireEvent, userEvent handle it
Don't call cleanup() - automatic after each test
Prefer ARIA props (role, aria-label, aria-disabled) over legacy accessibility* props
Use RNTL matchers over raw prop assertions

`*ByRole` Quick Reference

Common roles: button, text, heading (alias: header), searchbox, switch, checkbox, radio, img, link, alert, menu, menuitem, tab, tablist, progressbar, slider, spinbutton, timer, toolbar.

getByRole options: { name, disabled, selected, checked, busy, expanded, value: { min, max, now, text } }.

For *ByRole to match, the element must be an accessibility element:

Text, TextInput, Switch are by default
View needs accessible={true} (or use Pressable/TouchableOpacity)

waitFor

tsx

// Correct: action first, then wait for result
fireEvent.press(button);
await waitFor(() => {
  expect(screen.getByText('Result')).toBeOnTheScreen();
});

// Better: use findBy* instead
fireEvent.press(button);
expect(await screen.findByText('Result')).toBeOnTheScreen();

Options: waitFor(cb, { timeout: 1000, interval: 50 }). Works with Jest fake timers automatically.

Fake Timers

Recommended with userEvent (press/longPress involve real durations):

tsx

jest.useFakeTimers();

test('with fake timers', async () => {
  const user = userEvent.setup();
  render(<Component />);
  await user.press(screen.getByRole('button'));
  // ...
});

Custom Render

Wrap providers using wrapper option:

tsx

function renderWithProviders(ui: React.ReactElement) {
  return render(ui, {
    wrapper: ({ children }) => (
      <ThemeProvider>
        <AuthProvider>{children}</AuthProvider>
      </ThemeProvider>
    ),
  });
}

References

v13 API Reference [blocked] — Complete v13 API: sync render, queries, matchers, userEvent, React 19 compat
v14 API Reference [blocked] — Complete v14 API: async render, queries, matchers, userEvent, migration
Anti-Patterns [blocked] — Common mistakes to avoid