Make it possible to test that the stock app doesn't crash on startup and paints the basic scaffold …

sky/tests/raw/render_flex.dart

Index: sky/tests/raw/render_flex.dart
diff --git a/sky/tests/raw/render_flex.dart b/sky/tests/raw/render_flex.dart
index 49baa219a5233450afff561ab063f8725ba55986..a19861aa07ab4ef675815c06eef1f8313e606a12 100644
--- a/sky/tests/raw/render_flex.dart
+++ b/sky/tests/raw/render_flex.dart
@@ -2,15 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import '../resources/third_party/unittest/unittest.dart';
-import '../resources/unit.dart';
-import '../resources/display_list.dart';
 import 'dart:sky' as sky;
+
 import 'package:sky/framework/app.dart';
 import 'package:sky/framework/rendering/block.dart';
 import 'package:sky/framework/rendering/box.dart';
 import 'package:sky/framework/rendering/flex.dart';
 
+import '../resources/display_list.dart';
+import '../resources/third_party/unittest/unittest.dart';
+import '../resources/unit.dart';
+
 class RenderSolidColor extends RenderDecoratedBox {
   final sky.Size desiredSize;
   final sky.Color backgroundColor;
@@ -48,8 +50,6 @@ class RenderSolidColor extends RenderDecoratedBox {
   }
 }
 
-TestApp app;
-
 void main() {
   initUnit();
 
@@ -99,7 +99,8 @@ void main() {
 
     flexRoot.add(decoratedRow);
     decoratedRow.parentData.flex = 3;
-    app = new TestApp(root);
+
+    new TestRenderView(root);
 
     expect(root.size.width, equals(sky.view.width));
     expect(root.size.height, equals(sky.view.height));