Testing, React Native DevTools & Profiling

Evaluate Testing, React Native DevTools & Profiling on release devices through startup, JS/UI frame rate, memory, networking, crash recovery, permissions, signing, and store requirements—not only a debug build. Recheck New Architecture and dependency compatibility on every upgrade.

Build a Complete Mental Model

Evaluate Testing, React Native DevTools & Profiling on release devices through startup, JS/UI frame rate, memory, networking, crash recovery, permissions, signing, and store requirements—not only a debug build. Recheck New Architecture and dependency compatibility on every upgrade.

Apply It in Production React Native

Test an original Testing, React Native DevTools & Profiling example on Android and iOS with small and large screens, font scaling, dark mode, keyboard and screen reader use, slow/offline networking, denied permissions, and background/foreground transitions. Use DevTools, tests, and a release build where relevant.

After This Lesson

• Explain the shared-code and platform boundary
• Build an example with loading, error, and accessibility states
• Verify one Android/iOS behavior with a test or profiler

import { render, screen, userEvent } from '@testing-library/react-native';
import { SaveButton } from './SaveButton';

test('saves through an accessible button', async () => {
  const onSave = jest.fn();
  const user = userEvent.setup();
  render(<SaveButton onSave={onSave} />);
  await user.press(screen.getByRole('button', { name: 'Save' }));
  expect(onSave).toHaveBeenCalledTimes(1);
});

1 test passed

Testing Overview — React Native