From f44e4c0615d48337b4e003f5ce37a3fc73668697 Mon Sep 17 00:00:00 2001
From: Adam Barth <abarth@chromium.org>
Date: Tue, 25 Aug 2015 16:50:44 -0700
Subject: [PATCH] Add a basic test for Mimic tree movement

---
 sky/unit/test/widget/build_utils.dart |  9 ++++
 sky/unit/test/widget/mimic_test.dart  | 74 +++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 sky/unit/test/widget/mimic_test.dart

diff --git a/sky/unit/test/widget/build_utils.dart b/sky/unit/test/widget/build_utils.dart
index 3ef1bdb532f..c5b2b635ed2 100644
--- a/sky/unit/test/widget/build_utils.dart
+++ b/sky/unit/test/widget/build_utils.dart
@@ -40,6 +40,15 @@ class WidgetTester {
   TestApp _app;
   RenderView _renderView;
 
+  void walkWidgets(WidgetTreeWalker walker) {
+    void walk(Widget widget) {
+      walker(widget);
+      widget.walkChildren(walk);
+    }
+
+    _app.walkChildren(walk);
+  }
+
   void pumpFrame(WidgetBuilder builder) {
     _app.builder = builder;
     Component.flushBuild();
diff --git a/sky/unit/test/widget/mimic_test.dart b/sky/unit/test/widget/mimic_test.dart
new file mode 100644
index 00000000000..50834e7d874
--- /dev/null
+++ b/sky/unit/test/widget/mimic_test.dart
@@ -0,0 +1,74 @@
+import 'package:sky/widgets.dart';
+import 'package:test/test.dart';
+
+import 'build_utils.dart';
+
+void main() {
+  test('Mimic can track tree movements', () {
+    GlobalKey globalKey = new GlobalKey();
+    WidgetTester tester = new WidgetTester();
+
+    tester.pumpFrame(() {
+      return new Flex([
+        new Mimicable(
+          key: globalKey,
+          child: new Container(
+            key: new Key.stringify('inner'),
+            height: 10.0,
+            width: 10.0
+          )
+        )
+      ]);
+    });
+
+    bool mimicReady = false;
+
+    tester.pumpFrame(() {
+      return new Flex([
+        new Mimicable(
+          key: globalKey,
+          child: new Container(
+            height: 10.0,
+            width: 10.0
+          )
+        ),
+        new SizedBox(
+          height: 10.0,
+          width: 10.0,
+          child: new Mimic(
+            original: globalKey,
+            onMimicReady: () {
+              mimicReady = true;
+            }
+          )
+        )
+      ]);
+    });
+
+    expect(mimicReady, isTrue);
+
+    tester.pumpFrame(() {
+      return new Flex([
+        new Container(
+          key: new Key.stringify('outer'),
+          height: 10.0,
+          width: 10.0,
+          child: new Mimicable(
+            key: globalKey,
+            child: new Container(
+              key: new Key.stringify('inner'),
+              height: 10.0,
+              width: 10.0
+            )
+          )
+        ),
+        new SizedBox(
+          height: 10.0,
+          width: 10.0,
+          child: new Mimic(original: globalKey)
+        )
+      ]);
+    });
+
+  });
+}