Add:创建 flutter go web 版

packages/flutter_web/test/widgets/app_title_test.dart

@@ -0,0 +1,62 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Synced 2019-06-05T16:17:58.389887.
+
+import 'package:flutter_web_test/flutter_web_test.dart';
+import 'package:flutter_web/widgets.dart';
+
+const Color kTitleColor = Color(0xFF333333);
+const String kTitleString = 'Hello World';
+
+Future<void> pumpApp(WidgetTester tester,
+    {GenerateAppTitle onGenerateTitle}) async {
+  await tester.pumpWidget(
+    WidgetsApp(
+      supportedLocales: const <Locale>[
+        Locale('en', 'US'),
+        Locale('en', 'GB'),
+      ],
+      title: kTitleString,
+      color: kTitleColor,
+      onGenerateTitle: onGenerateTitle,
+      onGenerateRoute: (RouteSettings settings) {
+        return PageRouteBuilder<void>(pageBuilder: (BuildContext context,
+            Animation<double> animation, Animation<double> secondaryAnimation) {
+          return Container();
+        });
+      },
+    ),
+  );
+}
+
+void main() {
+  testWidgets('Specified title and color are used to build a Title',
+      (WidgetTester tester) async {
+    await pumpApp(tester);
+    expect(tester.widget<Title>(find.byType(Title)).title, kTitleString);
+    expect(tester.widget<Title>(find.byType(Title)).color, kTitleColor);
+  });
+
+  testWidgets('onGenerateTitle handles changing locales',
+      (WidgetTester tester) async {
+    String generateTitle(BuildContext context) {
+      return Localizations.localeOf(context).toString();
+    }
+
+    await pumpApp(tester, onGenerateTitle: generateTitle);
+    expect(tester.widget<Title>(find.byType(Title)).title, 'en_US');
+    expect(tester.widget<Title>(find.byType(Title)).color, kTitleColor);
+
+    await tester.binding.setLocale('en', 'GB');
+    await tester.pump();
+    expect(tester.widget<Title>(find.byType(Title)).title, 'en_GB');
+    expect(tester.widget<Title>(find.byType(Title)).color, kTitleColor);
+
+    // Not a supported locale, so we switch to supportedLocales[0], en_US
+    await tester.binding.setLocale('fr', 'CA');
+    await tester.pump();
+    expect(tester.widget<Title>(find.byType(Title)).title, 'en_US');
+    expect(tester.widget<Title>(find.byType(Title)).color, kTitleColor);
+  });
+}