Unit, Widget & Integration Testing

Build Unit, Widget & Integration Testing in feature slices and verify it with unit, widget, and integration tests. Use measurable acceptance criteria for build modes, frame time, rebuild count, accessibility, and deployment configuration.

Build a Complete Mental Model

Build Unit, Widget & Integration Testing in feature slices and verify it with unit, widget, and integration tests. Use measurable acceptance criteria for build modes, frame time, rebuild count, accessibility, and deployment configuration.

Apply It in Production Flutter

Run and test an original Unit, Widget & Integration Testing example with small and large screens, text scaling, empty/loading/error states, rapid interaction, navigation restoration, and disposal cases. Use flutter analyze, widget tests, and profile mode where relevant.

After This Lesson

• Explain constraints, state ownership, and lifecycle
• Write an example that passes flutter analyze
• Test a widget interaction or failure state

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('shows the title', (tester) async {
    await tester.pumpWidget(const MaterialApp(home: Text('Tasks')));
    expect(find.text('Tasks'), findsOneWidget);
  });
}

All tests passed!

Introduction to widget testing — Flutter