Add:创建 flutter go web 版

packages/flutter_web/test/widgets/animated_align_test.dart

@@ -0,0 +1,61 @@
+// Copyright 2015 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_test/flutter_web_test.dart';
+import 'package:flutter_web/rendering.dart';
+import 'package:flutter_web/widgets.dart';
+
+void main() {
+  testWidgets('AnimatedAlign.debugFillProperties', (WidgetTester tester) async {
+    const AnimatedAlign box = const AnimatedAlign(
+      alignment: Alignment.topCenter,
+      curve: Curves.ease,
+      duration: const Duration(milliseconds: 200),
+    );
+    expect(box, hasOneLineDescription);
+  });
+
+  testWidgets('AnimatedAlign alignment visual-to-directional animation',
+      (WidgetTester tester) async {
+    final Key target = new UniqueKey();
+
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.rtl,
+        child: new AnimatedAlign(
+          duration: const Duration(milliseconds: 200),
+          alignment: Alignment.topRight,
+          child: new SizedBox(key: target, width: 100.0, height: 200.0),
+        ),
+      ),
+    );
+
+    expect(tester.getSize(find.byKey(target)), const Size(100.0, 200.0));
+    expect(tester.getTopRight(find.byKey(target)), const Offset(800.0, 0.0));
+
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.rtl,
+        child: new AnimatedAlign(
+          duration: const Duration(milliseconds: 200),
+          alignment: AlignmentDirectional.bottomStart,
+          child: new SizedBox(key: target, width: 100.0, height: 200.0),
+        ),
+      ),
+    );
+
+    expect(tester.getSize(find.byKey(target)), const Size(100.0, 200.0));
+    expect(tester.getTopRight(find.byKey(target)), const Offset(800.0, 0.0));
+
+    await tester.pump(const Duration(milliseconds: 100));
+
+    expect(tester.getSize(find.byKey(target)), const Size(100.0, 200.0));
+    expect(tester.getTopRight(find.byKey(target)), const Offset(800.0, 200.0));
+
+    await tester.pump(const Duration(milliseconds: 500));
+
+    expect(tester.getSize(find.byKey(target)), const Size(100.0, 200.0));
+    expect(tester.getTopRight(find.byKey(target)), const Offset(800.0, 400.0));
+  });
+}