Add:创建 flutter go web 版

packages/flutter_web/test/widgets/widgets_app_test.dart

@@ -0,0 +1,44 @@
+// Copyright 2018 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.
+
+import 'package:flutter_web/material.dart';
+import 'package:flutter_web_test/flutter_web_test.dart';
+
+final _black = const Color.fromARGB(255, 0, 0, 0);
+
+void main() {
+  group('$WidgetsApp', () {
+    testWidgets('sets text direction', (WidgetTester tester) async {
+      await tester.pumpWidget(
+        new WidgetsApp(
+          color: _black,
+          pageRouteBuilder:
+              <T>(RouteSettings settings, WidgetBuilder builder) =>
+                  MaterialPageRoute<T>(settings: settings, builder: builder),
+          builder: (_, __) => new Text('no direction'),
+        ),
+      );
+
+      // Normally having a text with no direction would cause apps to throw,
+      // but WidgetsApp sets the direction.
+      await tester.pump();
+    });
+
+    testWidgets('sets a default text style', (WidgetTester tester) async {
+      await tester.pumpWidget(
+        new WidgetsApp(
+          color: _black,
+          textStyle: new TextStyle(fontFamily: 'FakeFont'),
+          pageRouteBuilder:
+              <T>(RouteSettings settings, WidgetBuilder builder) =>
+                  MaterialPageRoute<T>(settings: settings, builder: builder),
+          builder: (_, __) => new Text('hello'),
+        ),
+      );
+
+      RichText text = tester.firstWidget(find.byType(RichText));
+      expect(text.text.style.fontFamily, 'FakeFont');
+    });
+  });
+}