change window size

Author: nturgut

e2etests/web/regular_integration_tests/lib/screenshot_support.dart

@@ -3,12 +3,14 @@
 // found in the LICENSE file.
 
 import 'dart:io' as io;
+import 'dart:math';
 
 import 'package:flutter_driver/flutter_driver.dart';
 import 'package:integration_test/integration_test_driver_extended.dart' as test;
 
 import 'package:web_test_utils/goldens.dart';
 import 'package:web_test_utils/image_compare.dart';
+import 'package:webdriver/src/async/window.dart';
 
 import 'package:image/image.dart';
 
@@ -20,6 +22,9 @@ import 'package:image/image.dart';
 /// under test ex: a blinking cursor.
 const double kMaxDiffRateFailure = 0.5 / 100; // 0.5%
 
+const int kMaxScreenshotWidth = 1024;
+const int kMaxScreenshotHeight = 1024;
+
 /// Used for calling `integration_test` package.
 ///
 /// Compared to other similar classes which only included the following call:
@@ -32,13 +37,18 @@ const double kMaxDiffRateFailure = 0.5 / 100; // 0.5%
 /// It provides an `onScreenshot` callback to the `integrationDriver` method.
 /// It also includes options for updating the golden files.
 Future<void> runTestWithScreenshots(
-    {double diffRateFailure = kMaxDiffRateFailure}) async {
+    {double diffRateFailure = kMaxDiffRateFailure,
+     int browserWidth = kMaxScreenshotWidth,
+     int browserHeight = kMaxScreenshotHeight}) async {
   final WebFlutterDriver driver =
       await FlutterDriver.connect() as WebFlutterDriver;
 
   // Learn the browser in use from the webDriver.
   final String browser = driver.webDriver.capabilities['browserName'] as String;
 
+  final Window window = await driver.webDriver.window;
+  window.setSize(Rectangle<int>(0, 0, browserWidth, browserHeight));
+
   bool updateGoldens = false;
   final String updateGoldensFlag = io.Platform.environment['UPDATE_GOLDENS'];
   if (updateGoldensFlag == null || updateGoldensFlag.toLowerCase() != 'true') {