diff --git a/packages/unit/test/widget/align_test.dart b/packages/unit/test/widget/align_test.dart
index 6d3d05fc6ec..6a42aee9080 100644
--- a/packages/unit/test/widget/align_test.dart
+++ b/packages/unit/test/widget/align_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/animated_container_test.dart b/packages/unit/test/widget/animated_container_test.dart
index 653f20f6029..b048e0e334b 100644
--- a/packages/unit/test/widget/animated_container_test.dart
+++ b/packages/unit/test/widget/animated_container_test.dart
@@ -1,3 +1,7 @@
+// 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/animation.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
diff --git a/packages/unit/test/widget/block_test.dart b/packages/unit/test/widget/block_test.dart
index b0722d9c831..88075291fe2 100644
--- a/packages/unit/test/widget/block_test.dart
+++ b/packages/unit/test/widget/block_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/bottom_sheet_test.dart b/packages/unit/test/widget/bottom_sheet_test.dart
index a391afb62f4..92113964d5b 100644
--- a/packages/unit/test/widget/bottom_sheet_test.dart
+++ b/packages/unit/test/widget/bottom_sheet_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/box_decoration_test.dart b/packages/unit/test/widget/box_decoration_test.dart
index 57bdcd460c5..01bad08c477 100644
--- a/packages/unit/test/widget/box_decoration_test.dart
+++ b/packages/unit/test/widget/box_decoration_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/build_scope_test.dart b/packages/unit/test/widget/build_scope_test.dart
index ccb8788e923..0df49a94b21 100644
--- a/packages/unit/test/widget/build_scope_test.dart
+++ b/packages/unit/test/widget/build_scope_test.dart
@@ -1,3 +1,7 @@
+// 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/animation.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/center_test.dart b/packages/unit/test/widget/center_test.dart
index ee21e6b4991..f5a7d0fa907 100644
--- a/packages/unit/test/widget/center_test.dart
+++ b/packages/unit/test/widget/center_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/coordinates_test.dart b/packages/unit/test/widget/coordinates_test.dart
index 3bd38085553..a6d658bdf63 100644
--- a/packages/unit/test/widget/coordinates_test.dart
+++ b/packages/unit/test/widget/coordinates_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/custom_multi_child_layout_test.dart b/packages/unit/test/widget/custom_multi_child_layout_test.dart
index 324be32601c..3fc36f2e3dd 100644
--- a/packages/unit/test/widget/custom_multi_child_layout_test.dart
+++ b/packages/unit/test/widget/custom_multi_child_layout_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/custom_one_child_layout_test.dart b/packages/unit/test/widget/custom_one_child_layout_test.dart
index 6010414d47e..521216bb11c 100644
--- a/packages/unit/test/widget/custom_one_child_layout_test.dart
+++ b/packages/unit/test/widget/custom_one_child_layout_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/date_picker_test.dart b/packages/unit/test/widget/date_picker_test.dart
index 0fdbdc49bbc..e6459385b63 100644
--- a/packages/unit/test/widget/date_picker_test.dart
+++ b/packages/unit/test/widget/date_picker_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/dismissable_test.dart b/packages/unit/test/widget/dismissable_test.dart
index 05449ed4647..a2f928b6aeb 100644
--- a/packages/unit/test/widget/dismissable_test.dart
+++ b/packages/unit/test/widget/dismissable_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
@@ -280,3 +284,4 @@ void main() {
     });
   });
 }
+
diff --git a/packages/unit/test/widget/draggable_test.dart b/packages/unit/test/widget/draggable_test.dart
index 38d89945794..96e0d9d050f 100644
--- a/packages/unit/test/widget/draggable_test.dart
+++ b/packages/unit/test/widget/draggable_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/drawer_test.dart b/packages/unit/test/widget/drawer_test.dart
index 0d4707887ad..9e10faabeb2 100644
--- a/packages/unit/test/widget/drawer_test.dart
+++ b/packages/unit/test/widget/drawer_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/duplicate_key_test.dart b/packages/unit/test/widget/duplicate_key_test.dart
index 9040b6aee7f..dec4f9be1d7 100644
--- a/packages/unit/test/widget/duplicate_key_test.dart
+++ b/packages/unit/test/widget/duplicate_key_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/flex_test.dart b/packages/unit/test/widget/flex_test.dart
index 34a2710f91b..3d0316ce9f1 100644
--- a/packages/unit/test/widget/flex_test.dart
+++ b/packages/unit/test/widget/flex_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/focus_test.dart b/packages/unit/test/widget/focus_test.dart
index d270564a1f1..0c51130eedc 100644
--- a/packages/unit/test/widget/focus_test.dart
+++ b/packages/unit/test/widget/focus_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/fractionally_sized_box_test.dart b/packages/unit/test/widget/fractionally_sized_box_test.dart
index 148486b518b..9147fd3c592 100644
--- a/packages/unit/test/widget/fractionally_sized_box_test.dart
+++ b/packages/unit/test/widget/fractionally_sized_box_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/gesture_detector_test.dart b/packages/unit/test/widget/gesture_detector_test.dart
index 030af3c5e66..d83f16a0b50 100644
--- a/packages/unit/test/widget/gesture_detector_test.dart
+++ b/packages/unit/test/widget/gesture_detector_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/heroes_test.dart b/packages/unit/test/widget/heroes_test.dart
index 92aa348a2e7..25eb1e86474 100644
--- a/packages/unit/test/widget/heroes_test.dart
+++ b/packages/unit/test/widget/heroes_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/homogeneous_viewport_test.dart b/packages/unit/test/widget/homogeneous_viewport_test.dart
index 3f96271e908..85dd1ac3f28 100644
--- a/packages/unit/test/widget/homogeneous_viewport_test.dart
+++ b/packages/unit/test/widget/homogeneous_viewport_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/input_test.dart b/packages/unit/test/widget/input_test.dart
index f175e2b7882..e1796a0c6ef 100644
--- a/packages/unit/test/widget/input_test.dart
+++ b/packages/unit/test/widget/input_test.dart
@@ -1,3 +1,7 @@
+// 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:mojo_services/keyboard/keyboard.mojom.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
diff --git a/packages/unit/test/widget/listener_test.dart b/packages/unit/test/widget/listener_test.dart
index 804494b73c5..65014fc6069 100644
--- a/packages/unit/test/widget/listener_test.dart
+++ b/packages/unit/test/widget/listener_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/mixed_viewport_test.dart b/packages/unit/test/widget/mixed_viewport_test.dart
index f5532a85281..6bf63135f7a 100644
--- a/packages/unit/test/widget/mixed_viewport_test.dart
+++ b/packages/unit/test/widget/mixed_viewport_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/multichild_test.dart b/packages/unit/test/widget/multichild_test.dart
index e2f7b3428d7..bbd6be6e233 100644
--- a/packages/unit/test/widget/multichild_test.dart
+++ b/packages/unit/test/widget/multichild_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/navigator_test.dart b/packages/unit/test/widget/navigator_test.dart
index 88dd13bdcfb..0252798dc95 100644
--- a/packages/unit/test/widget/navigator_test.dart
+++ b/packages/unit/test/widget/navigator_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/pageable_list_test.dart b/packages/unit/test/widget/pageable_list_test.dart
index 15823ec0ad0..ce3e6358bb9 100644
--- a/packages/unit/test/widget/pageable_list_test.dart
+++ b/packages/unit/test/widget/pageable_list_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/parent_data_test.dart b/packages/unit/test/widget/parent_data_test.dart
index 59af8bfe87a..6307fd747ad 100644
--- a/packages/unit/test/widget/parent_data_test.dart
+++ b/packages/unit/test/widget/parent_data_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/positioned_test.dart b/packages/unit/test/widget/positioned_test.dart
index d6bcb0ebdec..8c12b36a147 100644
--- a/packages/unit/test/widget/positioned_test.dart
+++ b/packages/unit/test/widget/positioned_test.dart
@@ -1,3 +1,7 @@
+// 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/animation.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
diff --git a/packages/unit/test/widget/progress_indicator_test.dart b/packages/unit/test/widget/progress_indicator_test.dart
index 9a5c971f8ff..cbd5ac59cef 100644
--- a/packages/unit/test/widget/progress_indicator_test.dart
+++ b/packages/unit/test/widget/progress_indicator_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/material.dart';
diff --git a/packages/unit/test/widget/render_object_widget_test.dart b/packages/unit/test/widget/render_object_widget_test.dart
index 61e8944952e..eaccd4be231 100644
--- a/packages/unit/test/widget/render_object_widget_test.dart
+++ b/packages/unit/test/widget/render_object_widget_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/scrollable_list_hit_testing_test.dart b/packages/unit/test/widget/scrollable_list_hit_testing_test.dart
index 96182d686bc..a0023d096c4 100644
--- a/packages/unit/test/widget/scrollable_list_hit_testing_test.dart
+++ b/packages/unit/test/widget/scrollable_list_hit_testing_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/scrollable_list_horizontal_test.dart b/packages/unit/test/widget/scrollable_list_horizontal_test.dart
index 739f9ec1f5d..a6821739bec 100644
--- a/packages/unit/test/widget/scrollable_list_horizontal_test.dart
+++ b/packages/unit/test/widget/scrollable_list_horizontal_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/scrollable_list_vertical_test.dart b/packages/unit/test/widget/scrollable_list_vertical_test.dart
index 7a1d3f42c1d..c258b076a53 100644
--- a/packages/unit/test/widget/scrollable_list_vertical_test.dart
+++ b/packages/unit/test/widget/scrollable_list_vertical_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/scrollable_list_with_inherited_test.dart b/packages/unit/test/widget/scrollable_list_with_inherited_test.dart
index 53d7c712ad7..4c08334874c 100644
--- a/packages/unit/test/widget/scrollable_list_with_inherited_test.dart
+++ b/packages/unit/test/widget/scrollable_list_with_inherited_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/set_state_test.dart b/packages/unit/test/widget/set_state_test.dart
index f396a0778c6..848a656550b 100644
--- a/packages/unit/test/widget/set_state_test.dart
+++ b/packages/unit/test/widget/set_state_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/shader_mask_test.dart b/packages/unit/test/widget/shader_mask_test.dart
index 22c0360c715..784816ab8bb 100644
--- a/packages/unit/test/widget/shader_mask_test.dart
+++ b/packages/unit/test/widget/shader_mask_test.dart
@@ -1,3 +1,7 @@
+// 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 'dart:ui' as ui;
 
 import 'package:flutter/painting.dart';
diff --git a/packages/unit/test/widget/size_observer_test.dart b/packages/unit/test/widget/size_observer_test.dart
index 1ebb816c4a8..300c903d85d 100644
--- a/packages/unit/test/widget/size_observer_test.dart
+++ b/packages/unit/test/widget/size_observer_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
diff --git a/packages/unit/test/widget/snack_bar_test.dart b/packages/unit/test/widget/snack_bar_test.dart
index 881685f0df9..bdcc96471fa 100644
--- a/packages/unit/test/widget/snack_bar_test.dart
+++ b/packages/unit/test/widget/snack_bar_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/stack_test.dart b/packages/unit/test/widget/stack_test.dart
index 7f6dc31152b..512feda229a 100644
--- a/packages/unit/test/widget/stack_test.dart
+++ b/packages/unit/test/widget/stack_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/stateful_component_test.dart b/packages/unit/test/widget/stateful_component_test.dart
index c545744d647..45a116c587c 100644
--- a/packages/unit/test/widget/stateful_component_test.dart
+++ b/packages/unit/test/widget/stateful_component_test.dart
@@ -1,3 +1,7 @@
+// 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/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/stateful_components_test.dart b/packages/unit/test/widget/stateful_components_test.dart
index 828611e4c16..8f67396cd00 100644
--- a/packages/unit/test/widget/stateful_components_test.dart
+++ b/packages/unit/test/widget/stateful_components_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/syncing_test.dart b/packages/unit/test/widget/syncing_test.dart
index 77afd31e4a1..a2b2f28a058 100644
--- a/packages/unit/test/widget/syncing_test.dart
+++ b/packages/unit/test/widget/syncing_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/tabs_test.dart b/packages/unit/test/widget/tabs_test.dart
index 188bfad9e1a..e4e64e93fda 100644
--- a/packages/unit/test/widget/tabs_test.dart
+++ b/packages/unit/test/widget/tabs_test.dart
@@ -1,3 +1,7 @@
+// 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/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
diff --git a/packages/unit/test/widget/test_widgets.dart b/packages/unit/test/widget/test_widgets.dart
index 06caf1b45b9..381368947e0 100644
--- a/packages/unit/test/widget/test_widgets.dart
+++ b/packages/unit/test/widget/test_widgets.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/transform_test.dart b/packages/unit/test/widget/transform_test.dart
index b1e9afd3d34..95e0295eaba 100644
--- a/packages/unit/test/widget/transform_test.dart
+++ b/packages/unit/test/widget/transform_test.dart
@@ -1,3 +1,7 @@
+// 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/widgets.dart';
 import 'package:test/test.dart';
 
diff --git a/packages/unit/test/widget/widget_tester.dart b/packages/unit/test/widget/widget_tester.dart
index 88efb4f4470..002d896b9c7 100644
--- a/packages/unit/test/widget/widget_tester.dart
+++ b/packages/unit/test/widget/widget_tester.dart
@@ -1,3 +1,9 @@
+// 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 'dart:ui' as ui;
+
 import 'package:flutter/animation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
@@ -29,7 +35,10 @@ typedef Point SizeToPointFunction(Size size);
 class WidgetTester {
   WidgetTester._(FakeAsync async)
     : async = async,
-      clock = async.getClock(new DateTime.utc(2015, 1, 1));
+      clock = async.getClock(new DateTime.utc(2015, 1, 1)) {
+    timeDilation = 1.0;
+    ui.window.onBeginFrame = null;
+  }
 
   final FakeAsync async;
   final Clock clock;