Polishing, Testing, and Shipping to Both Stores

The Final Stretch: Polish, Test, Ship

UI Polish: Consistent Spacing and Typography

// src/theme.ts
export const theme = {
  colors: {
    primary: '#007AFF',
    background: '#F2F2F7',
    surface: '#FFFFFF',
    text: '#000000',
    textSecondary: '#8E8E93',
    error: '#FF3B30',
    success: '#34C759',
  },
  spacing: {
    xs: 4, sm: 8, md: 16, lg: 24, xl: 32
  },
  typography: {
    largeTitle: { fontSize: 34, fontWeight: '700' },
    title: { fontSize: 22, fontWeight: '600' },
    body: { fontSize: 17, fontWeight: '400' },
    caption: { fontSize: 12, fontWeight: '400' },
  },
  borderRadius: { sm: 8, md: 12, lg: 16, full: 999 },
};

Accessibility Audit

// Accessible icon button
<TouchableOpacity
  onPress={handleDelete}
  accessibilityLabel='Delete habit'
  accessibilityRole='button'
  accessibilityHint='Permanently removes this habit and its history'
  style={{ padding: 12 }}  // Ensures 44pt touch target with 20pt icon
>
  <Ionicons name='trash-outline' size={20} color='#FF3B30' />
</TouchableOpacity>

// Screen reader text for images
<Image
  source={{ uri: habit.icon }}
  accessibilityLabel={`${habit.name} habit icon`}
  accessible={true}
/>

Writing Unit Tests for Core Hooks

// src/utils/__tests__/streaks.test.ts
import { calculateStreak } from '../streaks';

describe('calculateStreak', () => {
  it('returns 0 for empty completions', () => {
    expect(calculateStreak([])).toBe(0);
  });

  it('returns 1 when only today is completed', () => {
    const today = new Date().toISOString().split('T')[0];
    expect(calculateStreak([today])).toBe(1);
  });

  it('returns correct streak for consecutive days', () => {
    const dates = ['2026-06-21', '2026-06-20', '2026-06-19'];
    // Mock today as 2026-06-21 in tests
    expect(calculateStreak(dates)).toBe(3);
  });

  it('stops at a gap', () => {
    // Today=21, gap at 20, then 19
    const dates = ['2026-06-21', '2026-06-19'];
    expect(calculateStreak(dates)).toBe(1);
  });
});

Component Tests with React Native Testing Library

// src/components/__tests__/HabitCard.test.tsx
import { render, fireEvent } from '@testing-library/react-native';
import { HabitCard } from '../HabitCard';

const mockHabit = {
  id: '1', name: 'Morning Run', icon: 'run',
  color: '#007AFF', streak: 5
};

it('renders habit name and streak', () => {
  const { getByText } = render(<HabitCard habit={mockHabit} onPress={() => {}} />);
  expect(getByText('Morning Run')).toBeTruthy();
  expect(getByText('5 days')).toBeTruthy();
});

it('calls onPress when tapped', () => {
  const onPress = jest.fn();
  const { getByTestId } = render(
    <HabitCard habit={mockHabit} onPress={onPress} testID='habit-card' />
  );
  fireEvent.press(getByTestId('habit-card'));
  expect(onPress).toHaveBeenCalledTimes(1);
});

Maestro E2E: Critical Path Test

# maestro/critical-path.yaml
---
appId: com.yourcompany.habittracker
---
- launchApp:
    clearState: true
- tapOn: 'Sign In'
- inputText: 'test@example.com'
- tapOn: 'Password'
- inputText: 'TestPass123!'
- tapOn: 'Sign In'
- waitForAnimationToEnd
- assertVisible: 'My Habits'
- tapOn: 'Add Habit'
- inputText: 'Morning Run'
- tapOn: 'Save'
- waitForAnimationToEnd
- assertVisible: 'Morning Run'
- tapOn:
    id: 'check-in-btn-1'
- waitForAnimationToEnd
- assertVisible: '1 day'  # Streak shows 1 day
- tapOn: 'Settings'
- tapOn: 'Sign Out'
- assertVisible: 'Sign In'

Bundle Size Optimization

# Analyze bundle
npx react-native-bundle-visualizer

# Opens a visual treemap in browser showing:
# - node_modules breakdown by size
# - Your source code size
# - Duplicate modules

# Common large packages to replace:
# moment (280KB) -> date-fns tree-shaking
# lodash (full, 70KB) -> lodash-es specific imports
# FontAwesome all icons -> import only used icons

# Result: each 100KB reduction = ~50KB gzip reduction
# = faster first install + lower Play/App Store size

Generating Store Assets

// app.json — icon and splash configuration
{
  'expo': {
    'icon': './assets/icon.png',        // 1024x1024 PNG
    'splash': {
      'image': './assets/splash.png',
      'resizeMode': 'contain',
      'backgroundColor': '#007AFF'
    },
    'ios': {
      'icon': './assets/icon.png'
    },
    'android': {
      'icon': './assets/icon.png',
      'adaptiveIcon': {
        'foregroundImage': './assets/adaptive-icon.png',
        'backgroundColor': '#007AFF'
      }
    }
  }
}

Final Build for Production

# Verify versions before building
cat app.json | grep '"version"'
# -> "version": "1.0.0"
# -> "versionCode": 1
# -> "buildNumber": "1"

# Build both platforms in parallel
eas build --platform ios --profile production &
eas build --platform android --profile production &
wait

# Or use the combined command:
eas build --platform all --profile production

# After builds complete, check status:
eas build:list --status finished --limit 2

Smoke Test the Production Build

// Pre-submission smoke test checklist:

// Install production build on physical device
// (not simulator — push notifications require real device)

// Test:
// [ ] Fresh install and sign up flow
// [ ] Sign out and sign in with existing account
// [ ] Core feature: create, complete, view streak
// [ ] Push notification: schedule and receive
// [ ] Background behavior: close and reopen app
// [ ] Deep links from browser/email
// [ ] Offline: airplane mode then restore network
// [ ] Landscape orientation (if not locked)
// [ ] All tabs and major screens load without crash
// [ ] Performance: no jank on FlatList scroll

Submitting to Both Stores

# Submit to App Store (TestFlight first, then App Review)
eas submit --platform ios --latest

# Submit to Play Console (internal -> production)
eas submit --platform android --latest

# Or submit both at once:
eas submit --platform all --latest

# After submission:
# iOS: App Store Connect > App > 1.0 Prepare for Submission
#      > Add for Review > Submit to App Review
# Android: Play Console > Production > Create release
#           > Promote internal build > Review > Start rollout

Quick Check

Lesson Recap