Testing sample (#500)

testing_app/test_driver/perf_test.dart

@@ -0,0 +1,114 @@
+// 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 Performance 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('Scrolling test', () async {
+      // Create Finders that are used multiple times.
+      final listFinder = find.byType('ListView');
+
+      // Record a performance profile as the app scrolls through
+      // the list of items.
+      final scrollingTimeline = await driver.traceAction(() async {
+        // Quickly scroll all the way down.
+        // Use dxScroll to scroll horizontally and dyScroll
+        // to scroll vertically.
+        await driver.scroll(listFinder, 0, -7000, Duration(seconds: 1));
+
+        // Quickly scroll back up all the way.
+        await driver.scroll(listFinder, 0, 7000, Duration(seconds: 1));
+      });
+
+      // Convert the Timeline into a TimelineSummary that's easier to
+      // read and understand.
+      final scrollingSummary = TimelineSummary.summarize(scrollingTimeline);
+
+      // Then, save the summary to disk.
+      // Results will be stored in the file 'build/scrolling.timeline.json'.
+      await scrollingSummary.writeSummaryToFile('scrolling', pretty: true);
+
+      // Write the entire timeline to disk in a json format.
+      // Results will be stored in
+      // the file 'build/scrolling.timeline_summary.json'.
+      // This file can be opened in the Chrome browser's tracing tools
+      // found by navigating to chrome://tracing.
+      await scrollingSummary.writeTimelineToFile('scrolling', pretty: true);
+    });
+
+    test('Favorites operations test', () async {
+      // Record a performance profile as operations are performed
+      // on the favorites list.
+      final operationsTimeline = await driver.traceAction(() 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 driver.tap(find.byValueKey(icon));
+
+          // Verify if appropriate message appears.
+          await driver.waitFor(find.text('Added to favorites.'));
+        }
+
+        // Tap onto the favorites button on the AppBar.
+        // The Favorites List should appear.
+        await driver.tap(find.text('Favorites'));
+
+        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 driver.tap(find.byValueKey(iconKey));
+
+          // Verify if appropriate message appears.
+          await driver.waitFor(find.text('Removed from favorites.'));
+        }
+      });
+
+      // Convert the Timeline into a TimelineSummary.
+      final operationsSummary = TimelineSummary.summarize(operationsTimeline);
+
+      // Then, save the summary to disk.
+      // Results will be stored in
+      // the file 'build/favorites_operations.timeline.json'.
+      await operationsSummary.writeSummaryToFile('favorites_operations',
+          pretty: true);
+
+      // Write the entire timeline to disk in a json format.
+      // Results will be stored in
+      // the file 'build/favorites_operations.timeline_summary.json'.
+      // This file can be opened in the Chrome browser's tracing tools
+      // found by navigating to chrome://tracing.
+      await operationsSummary.writeTimelineToFile('favorites_operations',
+          pretty: true);
+    });
+  });
+}