Testing sample (#500)

testing_app/test_driver/app_test.dart

@@ -0,0 +1,86 @@
+// 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_driver/flutter_driver.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Testing App Driver Tests', () {
+    FlutterDriver driver;
+
+    // Connect to the Flutter driver before running any tests.
+    setUpAll(() async {
+      driver = await FlutterDriver.connect();
+    });
+
+    // Close the connection to the driver after the tests have completed.
+    tearDownAll(() async {
+      if (driver != null) {
+        await driver.close();
+      }
+    });
+
+    test('Finding an item in the list', () async {
+      // Create Finders that are used multiple times.
+      final listFinder = find.byType('ListView');
+      final itemFinder = find.byValueKey('text_25');
+
+      // Scroll until the item to be found appears.
+      // Use dxScroll to scroll horizontally and dyScroll
+      // to scroll vertically.
+      await driver.scrollUntilVisible(
+        listFinder,
+        itemFinder,
+        dyScroll: -500.0,
+      );
+
+      // Check if the item contains the correct text.
+      expect(await driver.getText(itemFinder), 'Item 25');
+    });
+
+    test('Testing IconButtons', () async {
+      // Create a finder for the icon.
+      final iconFinder = find.byValueKey('icon_25');
+
+      // Tap onto the icon.
+      await driver.tap(iconFinder);
+
+      // Verify if appropriate message appears.
+      await driver.waitFor(find.text('Added to favorites.'));
+
+      // Wait for the first message to disappear.
+      await Future<void>.delayed(Duration(seconds: 1));
+
+      // Tap the icon again.
+      await driver.tap(iconFinder);
+
+      // Verify if appropriate message appears.
+      await driver.waitFor(find.text('Removed from favorites.'));
+    });
+
+    test('Verifying whether item gets added to favorites', () async {
+      // Tap onto the icon.
+      await driver.tap(find.byValueKey('icon_30'));
+
+      // Tap onto the favorites button on the AppBar.
+      // The Favorites List should appear.
+      await driver.tap(find.text('Favorites'));
+
+      // Check if the added item has appeared in the list.
+      expect(await driver.getText(find.byValueKey('favorites_text_30')),
+          equals('Item 30'));
+    });
+
+    test('Verifying remove button', () async {
+      // Tap onto the remove icon.
+      await driver.tap(find.byValueKey('remove_icon_30'));
+
+      // Verify if it disappears.
+      await driver.waitForAbsent(find.text('Item 30'));
+
+      // Verify if appropriate message appears.
+      await driver.waitFor(find.text('Removed from favorites.'));
+    });
+  });
+}