snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

testing_app/test/favorites_test.dart

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+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+import 'package:testing_app/models/favorites.dart';
+import 'package:testing_app/screens/favorites.dart';
+
+late Favorites favoritesList;
+
+Widget createFavoritesScreen() => ChangeNotifierProvider<Favorites>(
+  create: (context) {
+    favoritesList = Favorites();
+    return favoritesList;
+  },
+  child: const MaterialApp(home: FavoritesPage()),
+);
+
+void addItems() {
+  for (var i = 0; i < 5; i++) {
+    favoritesList.add(i);
+  }
+}
+
+void main() {
+  group('Favorites Page Widget Tests', () {
+    testWidgets('Test if Placeholder shows in case of empty list', (
+      tester,
+    ) async {
+      await tester.pumpWidget(createFavoritesScreen());
+
+      // Verify if the placeholder text shows up.
+      expect(find.text('No favorites added.'), findsOneWidget);
+    });
+
+    testWidgets('Test if ListView shows up', (tester) async {
+      await tester.pumpWidget(createFavoritesScreen());
+
+      addItems();
+      await tester.pumpAndSettle();
+
+      // Verify if ListView shows up.
+      expect(find.byType(ListView), findsOneWidget);
+    });
+
+    testWidgets('Testing Remove Button', (tester) async {
+      await tester.pumpWidget(createFavoritesScreen());
+
+      addItems();
+      await tester.pumpAndSettle();
+
+      // Get the total number of items available.
+      final totalItems = tester.widgetList(find.byIcon(Icons.close)).length;
+
+      // Remove one item.
+      await tester.tap(find.byIcon(Icons.close).first);
+      await tester.pumpAndSettle();
+
+      // Check if removed properly.
+      expect(
+        tester.widgetList(find.byIcon(Icons.close)).length,
+        lessThan(totalItems),
+      );
+
+      // Verify if the appropriate message is shown.
+      expect(find.text('Removed from favorites.'), findsOneWidget);
+    });
+  });
+}

testing_app/test/home_test.dart

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+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+import 'package:testing_app/main.dart';
+import 'package:testing_app/models/favorites.dart';
+
+Widget createHomeScreen() => ChangeNotifierProvider<Favorites>(
+  create: (context) => Favorites(),
+  child: MaterialApp.router(routerConfig: router()),
+);
+
+void main() {
+  group('Home Page Widget Tests', () {
+    testWidgets('Testing if ListView shows up', (tester) async {
+      await tester.pumpWidget(createHomeScreen());
+
+      // Verify if ListView shows up.
+      expect(find.byType(ListView), findsOneWidget);
+    });
+
+    testWidgets('Testing Scrolling', (tester) async {
+      await tester.pumpWidget(createHomeScreen());
+
+      // Check if "Item 0" is present on the screen.
+      expect(find.text('Item 0'), findsOneWidget);
+
+      // Fling i.e scroll down.
+      await tester.fling(
+        find.byType(ListView),
+        const Offset(0, -200),
+        3000,
+      );
+      await tester.pumpAndSettle();
+
+      // Check if "Item 0" disappeared.
+      expect(find.text('Item 0'), findsNothing);
+    });
+
+    testWidgets('Testing IconButtons', (tester) async {
+      await tester.pumpWidget(createHomeScreen());
+
+      // Check if any solid favorite icon is present.
+      expect(find.byIcon(Icons.favorite), findsNothing);
+
+      // Tap the first item's icon to add it to favorites.
+      await tester.tap(find.byIcon(Icons.favorite_border).first);
+      await tester.pumpAndSettle(const Duration(seconds: 1));
+
+      // Verify if the appropriate message is shown.
+      expect(find.text('Added to favorites.'), findsOneWidget);
+
+      // Check if any solid favorite icon shows up.
+      expect(find.byIcon(Icons.favorite), findsWidgets);
+
+      // Tap the first item's icon which has filled icon to
+      // remove it from favorites.
+      await tester.tap(find.byIcon(Icons.favorite).first);
+      await tester.pumpAndSettle(const Duration(seconds: 1));
+
+      // Verify if the appropriate message is shown.
+      expect(find.text('Removed from favorites.'), findsOneWidget);
+
+      // Check if the filled icon changes back to bordered icon.
+      expect(find.byIcon(Icons.favorite), findsNothing);
+    });
+
+    testWidgets('Testing Navigation', (tester) async {
+      await tester.pumpWidget(createHomeScreen());
+
+      // Tap the Favorites button in the app bar
+      await tester.tap(find.text('Favorites'));
+      await tester.pumpAndSettle();
+
+      // Verify if the empty favorites screen is shown.
+      expect(find.text('No favorites added.'), findsOneWidget);
+    });
+  });
+}

testing_app/test/models/favorites_test.dart

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+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:test/test.dart';
+import 'package:testing_app/models/favorites.dart';
+
+void main() {
+  group('Testing App Provider Tests', () {
+    // Create an object of the provider.
+    var favorites = Favorites();
+
+    test('A new item should be added', () {
+      var number = 35;
+
+      // Add the number to the list.
+      favorites.add(number);
+
+      // Verify if the number was inserted.
+      expect(favorites.items.contains(number), true);
+    });
+
+    test('An item should be removed', () {
+      var number = 45;
+
+      // Add the number to the list.
+      favorites.add(number);
+
+      // Verify if the number was inserted.
+      expect(favorites.items.contains(number), true);
+
+      // Remove the number from the list.
+      favorites.remove(number);
+
+      // Verify if the number was removed successfully.
+      expect(favorites.items.contains(number), false);
+    });
+  });
+}