Flutter Testing: Unit, Widget, and Integration Tests

Testing is essential for building reliable Flutter applications. Learn how to write effective tests at every level.

Unit Tests

Test business logic in isolation:

test('Counter increments', () {
  final counter = Counter();
  counter.increment();
  expect(counter.value, 1);
});

Widget Tests

Verify UI behavior:

testWidgets('Button displays text', (tester) async {
  await tester.pumpWidget(MyButton());
  expect(find.text('Click Me'), findsOneWidget);
});

Integration Tests

Test complete user flows:

testWidgets('Login flow', (tester) async {
  await tester.enterText(emailField, 'test@example.com');
  await tester.tap(submitButton);
  await tester.pumpAndSettle();
  expect(find.text('Welcome'), findsOneWidget);
});

Best Practices

• Aim for 80%+ code coverage
• Test edge cases and error handling
• Use mocks for external dependencies
• Run tests in CI/CD pipeline
• Keep tests fast and focused

Quality tests lead to quality apps.