Testing Trong Flutter
· 2 min read
Giới Thiệu
Testing là một phần quan trọng trong quá trình phát triển ứng dụng Flutter. Flutter hỗ trợ ba loại testing chính:
- Unit Testing
- Widget Testing
- Integration Testing
Unit Testing
Cài đặt Dependencies
dev_dependencies:
test: ^1.24.0
mockito: ^5.4.0
build_runner: ^2.4.0
Ví dụ Unit Test
// Class cần test
class Calculator {
int add(int a, int b) => a + b;
}
// Test file
import 'package:test/test.dart';
void main() {
group('Calculator', () {
late Calculator calculator;
setUp(() {
calculator = Calculator();
});
test('add should return correct sum', () {
expect(calculator.add(2, 3), equals(5));
});
});
}
Widget Testing
Cài đặt
dev_dependencies:
flutter_test:
sdk: flutter
Ví dụ Widget Test
testWidgets('Counter increments smoke test', (WidgetTester tester) async {
await tester.pumpWidget(MyApp());
expect(find.text('0'), findsOneWidget);
expect(find.text('1'), findsNothing);
await tester.tap(find.byIcon(Icons.add));
await tester.pump();
expect(find.text('0'), findsNothing);
expect(find.text('1'), findsOneWidget);
});
Integration Testing
Cài đặt
dev_dependencies:
integration_test:
sdk: flutter
Ví dụ Integration Test
void main() {
IntegrationTestWidgetsFlutterBinding.ensureInitialized();
testWidgets('Complete flow test', (WidgetTester tester) async {
await tester.pumpWidget(MyApp());
// Login flow
await tester.enterText(
find.byKey(Key('username')),
'testuser'
);
await tester.enterText(
find.byKey(Key('password')),
'password123'
);
await tester.tap(find.byType(ElevatedButton));
await tester.pumpAndSettle();
// Verify home screen
expect(find.text('Welcome'), findsOneWidget);
});
}
Mocking trong Flutter
Sử dụng Mockito
// Tạo mock class
@GenerateMocks([HttpClient])
void main() {
late MockHttpClient mockHttpClient;
setUp(() {
mockHttpClient = MockHttpClient();
});
test('fetchData returns data on success', () async {
when(mockHttpClient.get(any))
.thenAnswer((_) async => Response('{"data": "test"}', 200));
final result = await DataService(mockHttpClient).fetchData();
expect(result, equals('test'));
});
}
Best Practices
Unit Testing
- Test một function/method độc lập
- Tập trung vào business logic
- Sử dụng mocking cho external dependencies
Widget Testing
- Test UI components
- Verify widget rendering
- Test user interactions
Integration Testing
- Test complete user flows
- Verify app behavior end-to-end
- Test real device interactions
Continuous Integration
Cấu hình GitHub Actions
name: Flutter CI
on:
push:
branches: [ main ]
pull_request:
branches: [ main ]
jobs:
test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: subosito/flutter-action@v2
- run: flutter test
Test Coverage
Generating Coverage Reports
# Run tests with coverage
flutter test --coverage
# Generate HTML report
genhtml coverage/lcov.info -o coverage/html
