samples/testing_app/integration_test/perf_test.dart

// 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:integration_test/integration_test.dart';
import 'package:testing_app/main.dart';

void main() {
  group('Testing App Performance Tests', () {
    final binding = IntegrationTestWidgetsFlutterBinding.ensureInitialized();

    // The fullyLive frame policy simulates
    // the way Flutter responds to animations.
    binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;

    testWidgets('Scrolling test', (tester) async {
      await tester.pumpWidget(const TestingApp());

      // Create variables for finders that are used multiple times.
      final listFinder = find.byType(ListView);
      final scroller = tester.widget<ListView>(listFinder).controller;

      // Record the performance summary as the app scrolls through
      // the list of items.
      await binding.watchPerformance(
        () async {
          // Quickly scroll all the way down.
          await scroller!.animateTo(
            7000,
            duration: const Duration(seconds: 1),
            curve: Curves.linear,
          );
          await tester.pumpAndSettle();

          // Quickly scroll back up all the way.
          await scroller.animateTo(
            -7000,
            duration: const Duration(seconds: 1),
            curve: Curves.linear,
          );
          await tester.pumpAndSettle();
        },
        // Send the performance summary to the driver.
        reportKey: 'scrolling_summary',
      );
    });

    testWidgets('Favorites operations test', (tester) async {
      await tester.pumpWidget(const TestingApp());

      // Record the performance summary as operations are performed
      // on the favorites list.
      await binding.watchPerformance(
        () async {
          // Create a list of icon keys.
          final iconKeys = [
            'icon_0',
            'icon_1',
            'icon_2',
          ];

          // Add first three items to favorites.
          for (var icon in iconKeys) {
            // Tap onto the icon.
            await tester.tap(find.byKey(ValueKey(icon)));
            await tester.pumpAndSettle(const Duration(seconds: 1));

            // Verify if appropriate message appears.
            expect(find.text('Added to favorites.'), findsOneWidget);
          }

          // Tap onto the favorites button on the AppBar.
          // The Favorites List should appear.
          await tester.tap(find.text('Favorites'));
          await tester.pumpAndSettle();

          final removeIconKeys = [
            'remove_icon_0',
            'remove_icon_1',
            'remove_icon_2',
          ];

          // Remove all the items from favorites.
          for (final iconKey in removeIconKeys) {
            // Tap onto the remove icon.
            await tester.tap(find.byKey(ValueKey(iconKey)));
            await tester.pumpAndSettle(const Duration(seconds: 1));

            // Verify if appropriate message appears.
            expect(find.text('Removed from favorites.'), findsOneWidget);
          }
        },
        // Send the performance summary to the driver.
        reportKey: 'favorites_operations_summary',
      );
    });
  });
}