Testing in Flutter

Sep 19 2023 · Dart 2.19.3, Flutter 3.7.6, Android Studio 2021.3.1, Visual Studio Code 1.7.4

Part 3: Write Widget Tests

12. Mock Quotes Data & Override Riverpod Dependencies

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Previous episode: 11. Test Different Login Scenarios Next episode: 13. Test Quotes Page

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The App navigates automatically to the Quotes page after the user logs in. So we will test if the App navigates to the Quotes page after the user taps the login button with the correct credentials.

await tester.pumpAndSettle();
var quotesPageTitle = find.text('All Quotes');
expect(quotesPageTitle, findsOneWidget);
    builder: (_) => AllQuotesScreen(),
class MockQuotesService extends Mock implements QuotesService {}
MockQuotesService mockQuotesService = MockQuotesService();
await tester.pumpWidget(
    overrides: [
          .overrideWith((ref) => QuotesNotifier(mockQuotesService)),
    child: MaterialApp(
      home: LoginScreen(),

when(() => mockQuotesService.getQuotes())
  .thenAnswer((_) async => mockQuotesForTesting);
await tester.pumpAndSettle();