detox-skill

Files (3)

• SKILL.md
• advanced-patterns.md · reference/
• playbook.md · reference/

SKILL.md (first lines)

# Detox Automation Skill

You are a senior React Native QA engineer specializing in Detox.

## Core Patterns

### Basic Test

```javascript
describe('Login', () => {
  beforeAll(async () => {
    await device.launchApp();
  });

  beforeEach(async () => {
    await device.reloadReactNative();
  });

  it('should login with valid credentials', async () => {
    await element(by.id('emailInput')).typeText('user@test.com');
    await element(by.id('passwordInput')).typeText('password123');
    await element(by.id('loginButton')).tap();
    await expect(element(by.id('dashboardTitle'))).toBeVisible();
    await expect(element(by.text('Welcome'))).toBeVisible();
  });

  it('should show error for invalid credentials', async () => {
    await element(by.id('emailInput')).typeText('wrong@test.com');
    await element(by.id('passwordInput')).typeText('wrong');
    await element(by.id('loginButton')).tap();
    await expect(element(by.id('errorMessage'))).toBeVisible();
  });
});
```

### Matchers (Finding Elements)

```javascript
element(by.id('uniqueId'))                    // testID prop (best)
element(by.text('Login'))                      // Text content
element(by.label('Submit'))                    // Accessibility label
element(by.type('RCTTextInput'))              // Native type
element(by.traits(['button']))                 // iOS traits

// Combined
element(by.id('list').withDescendant(by.text('Item 1')))
element(by.id('item').withAncestor(by.id('list')))

// At index (multiple matches)
element(by.text('Delete')).atIndex(0)
```

### Actions

```javascript
await element(by.id('btn')).tap();
await element(by.id('btn')).longPress();
await element(by.id('btn')).multiTap(3);
await element(by.id('input')).typeText('hello');
await element(by.id('input')).replaceText('new text');
await element(by.id('input')).clearText();
await element(by.id('scrollView')).scroll(200, 'down');
await element(by.id('scrollView')).scrollTo('bottom');
await element(by.id('item')).swipe('left', 'fast');
await element(by.id('input')).tapReturnKey();
```

### Expectations

```javascript
await expect(element(by.id('title'))).toBeVisible();
await expect(element(by.id('title'))).not.toBeVisible();
await expect(element(by.id('title'))).toExist();
await expect(element(by.id('title'))).toHaveText('Welcome');
await expect(element(by.id('toggle'))).toHaveToggleValue(true);
await expect(element(by.id('input'))).toHaveValue('hello');
```

### Device Control

```javascript
await device.launchApp({ newInstance: true });
await device.reloadReactNative();
await device.sendToHome();
await device.terminateApp();
await device.installApp();
await device.shake();                       // Shake gesture
await device.setLocation(37.7749, -122.4194); // GPS
await device.setURLBlacklist(['.*cdn.example.*']); // Block URLs
```

### Anti-Patterns

| Bad | Good | Why |
|-----|------|-----|
| `waitFor().withTimeout()` everywhere | Trust Detox auto-sync | Detox waits automatically |
| No `testID` on components | Add `testID` prop | Stable selectors |
| `device.launchApp()` in every test | `device.reloadReactNative()` | Faster |
| Manual delays | Detox synchronization | Built-in waiting |

### .detoxrc.js Configuration

```javascript
module.exports = {
  testRunner: { args: { config: 'e2e/jest.config.js' } },
  apps: {
    'ios.debug': {
      type: 'ios.app',
      binaryPath: 'ios/build/MyApp.app',
      build: 'xcodebuild -workspace ios/MyApp.xcworkspace -scheme MyApp -configuration Debug -sdk iphonesimulator -derivedDataPath ios/build',
    },
    'android.debug': {
      type: 'android.apk',
      binaryPath: 'android/app/build/outputs/apk/debug/app-debug.apk',
      build: 'cd android && ./gradlew assembleDebug assembleAndroidTest -DtestBuildType=debug',
      reversePorts: [8081],
    },
  },
  devices: {

From LambdaTest/agent-skills, MIT.

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