Fix some typos (#12233)

packages/flutter/lib/src/cupertino/tab_view.dart

@@ -27,7 +27,7 @@ import 'route.dart';
 ///  4. Finally if all else fails [onUnknownRoute] is called.
 ///
 /// These navigation properties are not shared with any sibling [CupertinoTabView]
-/// nor any ancestor or descendent [Navigator] instances.
+/// nor any ancestor or descendant [Navigator] instances.
 ///
 /// See also:
 ///
@@ -70,7 +70,7 @@ class CupertinoTabView extends StatelessWidget {
   /// instead.
   ///
   /// This routing table is not shared with any routing tables of ancestor or
-  /// descendent [Navigator]s.
+  /// descendant [Navigator]s.
   final Map<String, WidgetBuilder> routes;
 
   /// The route generator callback used when the tab view is navigated to a named route.
@@ -90,7 +90,7 @@ class CupertinoTabView extends StatelessWidget {
 
   /// The list of observers for the [Navigator] created in this tab view.
   ///
-  /// This list of observers is not shared with ancestor or descendent [Navigator]s.
+  /// This list of observers is not shared with ancestor or descendant [Navigator]s.
   final List<NavigatorObserver> navigatorObservers;
 
   @override

packages/flutter/lib/src/gestures/events.dart

@@ -238,7 +238,7 @@ abstract class PointerEvent {
 
   /// We occasionally synthesize PointerEvents that aren't exact translations
   /// of [ui.PointerData] from the engine to cover small cross-OS discrepancies
-  /// in pointer behaviours.
+  /// in pointer behaviors.
   ///
   /// For instance, on end events, Android always drops any location changes
   /// that happened between its reporting intervals when emiting the end events.

packages/flutter/lib/src/rendering/object.dart

@@ -1317,7 +1317,7 @@ class PipelineOwner {
 /// Hit testing is even more open-ended than layout. There is no method to
 /// override, you are expected to provide one.
 ///
-/// The general behaviour of your hit-testing method should be similar to the
+/// The general behavior of your hit-testing method should be similar to the
 /// behavior described for [RenderBox]. The main difference is that the input
 /// need not be an [Offset]. You are also allowed to use a different subclass of
 /// [HitTestEntry] when adding entries to the [HitTestResult]. When the

packages/flutter/lib/src/widgets/basic.dart

@@ -1488,7 +1488,7 @@ class SizedBox extends SingleChildRenderObjectWidget {
 /// )
 /// ```
 ///
-/// The same behaviour can be obtained using the [new SizedBox.expand] widget.
+/// The same behavior can be obtained using the [new SizedBox.expand] widget.
 ///
 /// See also:
 ///

packages/flutter/lib/src/widgets/container.dart

@@ -134,7 +134,7 @@ class DecoratedBox extends SingleChildRenderObjectWidget {
 /// _See [BoxConstraints] for an introduction to box layout models._
 ///
 /// Since [Container] combines a number of other widgets each with their own
-/// layout behavior, [Container]'s layout behaviour is somewhat complicated.
+/// layout behavior, [Container]'s layout behavior is somewhat complicated.
 ///
 /// tl;dr: [Container] tries, in order: to honor [alignment], to size itself to
 /// the [child], to honor the `width`, `height`, and [constraints], to expand to

packages/flutter/test/cupertino/page_test.dart

@@ -14,7 +14,7 @@ void main() {
           return new CupertinoPageRoute<Null>(
             settings: settings,
             builder: (BuildContext context) {
-              final String pageNumber = settings.name == '/' ? "1" : "2";
+              final String pageNumber = settings.name == '/' ? '1' : '2';
               return new Center(child: new Text('Page $pageNumber'));
             }
           );
@@ -150,7 +150,7 @@ void main() {
           return new CupertinoPageRoute<Null>(
             settings: settings,
             builder: (BuildContext context) {
-              final String pageNumber = settings.name == '/' ? "1" : "2";
+              final String pageNumber = settings.name == '/' ? '1' : '2';
               return new Center(child: new Text('Page $pageNumber'));
             }
           );

packages/flutter/test/engine/color_test.dart

@@ -7,7 +7,7 @@ import 'dart:ui';
 import 'package:test/test.dart';
 
 void main() {
-  test("color accessors should work", () {
+  test('color accessors should work', () {
     final Color foo = const Color(0x12345678);
     expect(foo.alpha, equals(0x12));
     expect(foo.red, equals(0x34));
@@ -15,14 +15,14 @@ void main() {
     expect(foo.blue, equals(0x78));
   });
 
-  test("paint set to black", () {
+  test('paint set to black', () {
     final Color c = const Color(0x00000000);
     final Paint p = new Paint();
     p.color = c;
     expect(c.toString(), equals('Color(0x00000000)'));
   });
 
-  test("color created with out of bounds value", () {
+  test('color created with out of bounds value', () {
     try {
       final Color c = const Color(0x100 << 24);
       final Paint p = new Paint();
@@ -32,7 +32,7 @@ void main() {
     }
   });
 
-  test("color created with wildly out of bounds value", () {
+  test('color created with wildly out of bounds value', () {
     try {
       final Color c = const Color(1 << 1000000);
       final Paint p = new Paint();

packages/flutter/test/engine/paragraph_builder_test.dart

@@ -7,7 +7,7 @@ import 'dart:ui';
 import 'package:test/test.dart';
 
 void main() {
-  test("Should be able to build and layout a paragraph", () {
+  test('Should be able to build and layout a paragraph', () {
     final ParagraphBuilder builder = new ParagraphBuilder(new ParagraphStyle());
     builder.addText('Hello');
     final Paragraph paragraph = builder.build();

packages/flutter/test/engine/rect_test.dart

@@ -7,7 +7,7 @@ import 'dart:ui';
 import 'package:test/test.dart';
 
 void main() {
-  test("rect accessors", () {
+  test('rect accessors', () {
     final Rect r = new Rect.fromLTRB(1.0, 3.0, 5.0, 7.0);
     expect(r.left, equals(1.0));
     expect(r.top, equals(3.0));
@@ -15,7 +15,7 @@ void main() {
     expect(r.bottom, equals(7.0));
   });
 
-  test("rect created by width and height", () {
+  test('rect created by width and height', () {
     final Rect r = new Rect.fromLTWH(1.0, 3.0, 5.0, 7.0);
     expect(r.left, equals(1.0));
     expect(r.top, equals(3.0));
@@ -23,7 +23,7 @@ void main() {
     expect(r.bottom, equals(10.0));
   });
 
-  test("rect intersection", () {
+  test('rect intersection', () {
     final Rect r1 = new Rect.fromLTRB(0.0, 0.0, 100.0, 100.0);
     final Rect r2 = new Rect.fromLTRB(50.0, 50.0, 200.0, 200.0);
     final Rect r3 = r1.intersect(r2);

packages/flutter/test/foundation/profile_test.dart

@@ -6,12 +6,12 @@ import 'package:flutter/foundation.dart';
 import 'package:test/test.dart';
 
 // We run our tests in debug mode, to this will always evaluate to false...
-const bool isReleaseMode = const bool.fromEnvironment("dart.vm.product");
+const bool isReleaseMode = const bool.fromEnvironment('dart.vm.product');
 
 void main() {
   // TODO(devoncarew): This test - while very nice - isn't testing what we really want to know:
   // that the code in the `profile` closure is omitted in release mode.
-  test("profile invokes its closure in debug or profile mode", () {
+  test('profile invokes its closure in debug or profile mode', () {
     int count = 0;
     profile(() {
       count++;

packages/flutter/test/gestures/pointer_router_test.dart

@@ -127,7 +127,7 @@ void main() {
     });
     router.addRoute(2, (PointerEvent event) {
       log.add('per-pointer 2');
-      throw "Having a bad day!";
+      throw 'Having a bad day!';
     });
     router.addRoute(2, (PointerEvent event) {
       log.add('per-pointer 3');

packages/flutter/test/harness/trivial_test.dart

@@ -5,7 +5,7 @@
 import 'package:test/test.dart';
 
 void main() {
-  test("should pass", () {
+  test('should pass', () {
     expect(1 + 1, equals(2));
   });
 }

packages/flutter/test/material/dropdown_test.dart

@@ -40,7 +40,7 @@ Widget buildFrame({
             return new DropdownMenuItem<String>(
               key: new ValueKey<String>(item),
               value: item,
-              child: new Text(item, key: new ValueKey<String>(item + "Text")),
+              child: new Text(item, key: new ValueKey<String>(item + 'Text')),
             );
           }).toList(),
         ),
@@ -403,7 +403,7 @@ void main() {
     Rect getMenuRect() {
       Rect menuRect;
       tester.element(find.byType(ListView)).visitAncestorElements((Element element) {
-        if (element.toString().startsWith("_DropdownMenu")) {
+        if (element.toString().startsWith('_DropdownMenu')) {
           final RenderBox box = element.findRenderObject();
           assert(box != null);
           menuRect =  box.localToGlobal(Offset.zero) & box.size;

packages/flutter/test/material/feedback_tester.dart

@@ -11,9 +11,9 @@ import 'package:flutter/services.dart';
 class FeedbackTester {
   FeedbackTester() {
     SystemChannels.platform.setMockMethodCallHandler((MethodCall methodCall) {
-      if (methodCall.method == "HapticFeedback.vibrate")
+      if (methodCall.method == 'HapticFeedback.vibrate')
         _hapticCount++;
-      if (methodCall.method == "SystemSound.play" &&
+      if (methodCall.method == 'SystemSound.play' &&
           methodCall.arguments == SystemSoundType.click.toString())
         _clickSoundCount++;
     });

packages/flutter/test/material/localizations_test.dart

@@ -135,8 +135,8 @@ void main() {
       expect(localizations.selectAllButtonLabel, isNotNull);
       expect(localizations.viewLicensesButtonLabel, isNotNull);
 
-      expect(localizations.aboutListTileTitle("FOO"), isNotNull);
-      expect(localizations.aboutListTileTitle("FOO"), contains("FOO"));
+      expect(localizations.aboutListTileTitle('FOO'), isNotNull);
+      expect(localizations.aboutListTileTitle('FOO'), contains('FOO'));
 
       expect(localizations.selectedRowCountTitle(0), isNotNull);
       expect(localizations.selectedRowCountTitle(1), isNotNull);

packages/flutter/test/material/snack_bar_test.dart

@@ -62,7 +62,7 @@ void main() {
               onTap: () {
                 snackBarCount += 1;
                 Scaffold.of(context).showSnackBar(new SnackBar(
-                  content: new Text("bar$snackBarCount"),
+                  content: new Text('bar$snackBarCount'),
                   duration: const Duration(seconds: 2)
                 ));
               },
@@ -139,7 +139,7 @@ void main() {
               onTap: () {
                 snackBarCount += 1;
                 lastController = Scaffold.of(context).showSnackBar(new SnackBar(
-                  content: new Text("bar$snackBarCount"),
+                  content: new Text('bar$snackBarCount'),
                   duration: new Duration(seconds: time)
                 ));
               },
@@ -223,7 +223,7 @@ void main() {
               onTap: () {
                 snackBarCount += 1;
                 Scaffold.of(context).showSnackBar(new SnackBar(
-                  content: new Text("bar$snackBarCount"),
+                  content: new Text('bar$snackBarCount'),
                   duration: const Duration(seconds: 2)
                 ));
               },

packages/flutter/test/material/text_field_test.dart

@@ -960,7 +960,7 @@ void main() {
     expect(find.text('Suffix'), findsOneWidget);
 
     // Enter some text, and the prefix should still display.
-    await tester.enterText(find.byKey(secondKey), "Hi");
+    await tester.enterText(find.byKey(secondKey), 'Hi');
     await tester.pump();
     await tester.pump(const Duration(seconds: 1));
 
@@ -1014,7 +1014,7 @@ void main() {
 
     // Enter some text, and the hint should disappear and the prefix and suffix
     // should appear.
-    await tester.enterText(find.byKey(secondKey), "Hi");
+    await tester.enterText(find.byKey(secondKey), 'Hi');
     await tester.pump();
     await tester.pump(const Duration(seconds: 1));
 
@@ -1086,7 +1086,7 @@ void main() {
 
     // Enter some text, and the label should stay and the prefix should
     // remain.
-    await tester.enterText(find.byKey(secondKey), "Hi");
+    await tester.enterText(find.byKey(secondKey), 'Hi');
     await tester.pump();
     await tester.pump(const Duration(seconds: 1));
 

packages/flutter/test/material/theme_test.dart

@@ -269,7 +269,7 @@ void main() {
   });
 
   testWidgets(
-    'Same ThemeData reapplied does not trigger descendents rebuilds',
+    'Same ThemeData reapplied does not trigger descendants rebuilds',
     (WidgetTester tester) async {
       testBuildCalled = 0;
       ThemeData themeData = new ThemeData(primaryColor: const Color(0xFF000000));

packages/flutter/test/material/user_accounts_drawer_header_test.dart

@@ -37,8 +37,8 @@ void main() {
                   child: const Text('E'),
                 )
               ],
-              accountName: const Text("name"),
-              accountEmail: const Text("email"),
+              accountName: const Text('name'),
+              accountEmail: const Text('email'),
             ),
           ),
         ),

packages/flutter/test/painting/transform_utilities_test.dart

@@ -7,7 +7,7 @@ import 'package:test/test.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 void main() {
-  test("MatrixUtils.getAsTranslation()", () {
+  test('MatrixUtils.getAsTranslation()', () {
     Matrix4 test;
     test = new Matrix4.identity();
     expect(MatrixUtils.getAsTranslation(test), equals(Offset.zero));

packages/flutter/test/rendering/baseline_test.dart

@@ -9,7 +9,7 @@ import 'package:test/test.dart';
 import 'rendering_tester.dart';
 
 void main() {
-  test("RenderBaseline", () {
+  test('RenderBaseline', () {
     RenderBaseline parent;
     RenderSizedBox child;
     final RenderBox root = new RenderPositionedBox(

packages/flutter/test/rendering/box_test.dart

@@ -9,7 +9,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'rendering_tester.dart';
 
 void main() {
-  test("should size to render view", () {
+  test('should size to render view', () {
     final RenderBox root = new RenderDecoratedBox(
       decoration: new BoxDecoration(
         color: const Color(0xFF00FF00),
@@ -65,7 +65,7 @@ void main() {
     expect(outer.size.height, equals(600.0));
   });
 
-  test("should not have a 0 sized colored Box", () {
+  test('should not have a 0 sized colored Box', () {
     final RenderBox coloredBox = new RenderDecoratedBox(
       decoration: const BoxDecoration(),
     );
@@ -107,7 +107,7 @@ void main() {
     );
   });
 
-  test("reparenting should clear position", () {
+  test('reparenting should clear position', () {
     final RenderDecoratedBox coloredBox = new RenderDecoratedBox(
       decoration: const BoxDecoration(),
     );

packages/flutter/test/rendering/constraints_test.dart

@@ -8,7 +8,7 @@ import 'package:test/test.dart';
 import 'rendering_tester.dart';
 
 void main() {
-  test("RenderFractionallySizedBox constraints", () {
+  test('RenderFractionallySizedBox constraints', () {
     RenderBox root, leaf, test;
     root = new RenderPositionedBox(
       child: new RenderConstrainedBox(
@@ -31,7 +31,7 @@ void main() {
     expect(leaf.size.height, equals(100.0));
   });
 
-  test("BoxConstraints with NaN", () {
+  test('BoxConstraints with NaN', () {
     String result;
 
     result = 'no exception';

packages/flutter/test/rendering/non_render_object_root_test.dart

@@ -43,7 +43,7 @@ class RealRoot extends AbstractNode {
 }
 
 void main() {
-  test("non-RenderObject roots", () {
+  test('non-RenderObject roots', () {
     RenderPositionedBox child;
     final RealRoot root = new RealRoot(
       child = new RenderPositionedBox(

packages/flutter/test/rendering/object_test.dart

@@ -7,7 +7,7 @@ import 'package:flutter/rendering.dart';
 import 'package:test/test.dart';
 
 void main() {
-  test("ensure frame is scheduled for markNeedsSemanticsUpdate", () {
+  test('ensure frame is scheduled for markNeedsSemanticsUpdate', () {
     final TestRenderObject renderObject = new TestRenderObject();
     int onNeedVisualUpdateCallCount = 0;
     final PipelineOwner owner = new PipelineOwner(onNeedVisualUpdate: () {
@@ -22,7 +22,7 @@ void main() {
     expect(onNeedVisualUpdateCallCount, 2);
   });
 
-  test("ensure frame is scheduled for markNeedsSemanticsUpdate with onlyChanges: true", () {
+  test('ensure frame is scheduled for markNeedsSemanticsUpdate with onlyChanges: true', () {
     final TestRenderObject renderObject = new TestRenderObject();
     int onNeedVisualUpdateCallCount = 0;
     final PipelineOwner owner = new PipelineOwner(onNeedVisualUpdate: () {

packages/flutter/test/rendering/offstage_test.dart

@@ -9,7 +9,7 @@ import 'package:test/test.dart';
 import 'rendering_tester.dart';
 
 void main() {
-  test("offstage", () {
+  test('offstage', () {
     RenderBox child;
     bool painted = false;
     // incoming constraints are tight 800x600

packages/flutter/test/rendering/repaint_boundary_test.dart

@@ -8,7 +8,7 @@ import 'package:test/test.dart';
 import 'rendering_tester.dart';
 
 void main() {
-  test("nested repaint boundaries - smoke test", () {
+  test('nested repaint boundaries - smoke test', () {
     RenderOpacity a, b, c;
     a = new RenderOpacity(
       opacity: 1.0,

packages/flutter/test/scheduler/scheduler_test.dart

@@ -17,7 +17,7 @@ class TestStrategy {
 }
 
 void main() {
-  test("Tasks are executed in the right order", () {
+  test('Tasks are executed in the right order', () {
     final SchedulerBinding scheduler = new TestSchedulerBinding();
     final TestStrategy strategy = new TestStrategy();
     scheduler.schedulingStrategy = strategy.shouldRunTaskWithPriority;

packages/flutter/test/services/system_chrome_test.dart

@@ -35,7 +35,7 @@ void main() {
 
     expect(log, equals(<MethodCall>[new MethodCall(
       'SystemChrome.setPreferredOrientations',
-      <String>["DeviceOrientation.portraitUp"],
+      <String>['DeviceOrientation.portraitUp'],
     )]));
   });
 
@@ -52,7 +52,7 @@ void main() {
 
     expect(log, equals(<MethodCall>[new MethodCall(
       'SystemChrome.setApplicationSwitcherDescription',
-      <String, dynamic>{"label":"Example label","primaryColor":4278255360}
+      <String, dynamic>{'label':'Example label','primaryColor':4278255360}
     )]));
   });
 
@@ -82,7 +82,7 @@ void main() {
 
     expect(log, equals(<MethodCall>[new MethodCall(
       'SystemChrome.setEnabledSystemUIOverlays',
-      <String>["SystemUiOverlay.top"],
+      <String>['SystemUiOverlay.top'],
     )]));
   });
 }

packages/flutter/test/services/system_sound_test.dart

@@ -15,6 +15,6 @@ void main() {
 
     await SystemSound.play(SystemSoundType.click);
 
-    expect(log, equals(<MethodCall>[const MethodCall('SystemSound.play', "SystemSoundType.click")]));
+    expect(log, equals(<MethodCall>[const MethodCall('SystemSound.play', 'SystemSoundType.click')]));
   });
 }

packages/flutter/test/ui/rrect_test.dart

@@ -7,7 +7,7 @@ import 'package:flutter/painting.dart';
 import 'package:test/test.dart';
 
 void main() {
-  test("RRect.contains()", () {
+  test('RRect.contains()', () {
     final RRect rrect = new RRect.fromRectAndCorners(
       new Rect.fromLTRB(1.0, 1.0, 2.0, 2.0),
       topLeft: const Radius.circular(0.5),
@@ -26,7 +26,7 @@ void main() {
     expect(rrect.contains(const Offset(1.0, 1.99)), isTrue);
   });
 
-  test("RRect.contains() large radii", () {
+  test('RRect.contains() large radii', () {
     final RRect rrect = new RRect.fromRectAndCorners(
       new Rect.fromLTRB(1.0, 1.0, 2.0, 2.0),
       topLeft: const Radius.circular(5000.0),

packages/flutter/test/widgets/dismissible_test.dart

@@ -93,7 +93,7 @@ Future<Null> dismissElement(WidgetTester tester, Finder finder, { DismissDirecti
       upLocation = tester.getBottomLeft(finder);
       break;
     default:
-      fail("unsupported gestureDirection");
+      fail('unsupported gestureDirection');
   }
 
   final TestGesture gesture = await tester.startGesture(downLocation, pointer: 5);

packages/flutter/test/widgets/global_keys_moving_test.dart

@@ -10,7 +10,7 @@ class Item {
   GlobalKey key2 = new GlobalKey();
 
   @override
-  String toString() => "Item($key1, $key2)";
+  String toString() => 'Item($key1, $key2)';
 }
 List<Item> items = <Item>[new Item(), new Item()];
 

packages/flutter/test/widgets/grid_view_layout_test.dart

@@ -33,13 +33,13 @@ void main() {
     expect(tester.renderObjectList<RenderBox>(find.byType(DecoratedBox)), hasLength(4));
 
     for (RenderBox box in tester.renderObjectList<RenderBox>(find.byType(DecoratedBox))) {
-      expect(box.size.width, equals(100.0), reason: "child width");
-      expect(box.size.height, equals(100.0), reason: "child height");
+      expect(box.size.width, equals(100.0), reason: 'child width');
+      expect(box.size.height, equals(100.0), reason: 'child height');
     }
 
     final RenderBox grid = tester.renderObject(find.byType(GridView));
-    expect(grid.size.width, equals(200.0), reason: "grid width");
-    expect(grid.size.height, equals(200.0), reason: "grid height");
+    expect(grid.size.width, equals(200.0), reason: 'grid width');
+    expect(grid.size.height, equals(200.0), reason: 'grid height');
 
     expect(grid.debugNeedsLayout, false);
 
@@ -60,11 +60,11 @@ void main() {
     );
 
     for (RenderBox box in tester.renderObjectList<RenderBox>(find.byType(DecoratedBox))) {
-      expect(box.size.width, equals(50.0), reason: "child width");
-      expect(box.size.height, equals(50.0), reason: "child height");
+      expect(box.size.width, equals(50.0), reason: 'child width');
+      expect(box.size.height, equals(50.0), reason: 'child height');
     }
 
-    expect(grid.size.width, equals(200.0), reason: "grid width");
-    expect(grid.size.height, equals(50.0), reason: "grid height");
+    expect(grid.size.width, equals(200.0), reason: 'grid width');
+    expect(grid.size.height, equals(50.0), reason: 'grid height');
   });
 }

packages/flutter/test/widgets/independent_widget_layout_test.dart

@@ -92,7 +92,7 @@ class TriggerableState extends State<TriggerableWidget> {
   @override
   Widget build(BuildContext context) {
     widget.counter.count++;
-    return new Text("Bang $_count!", textDirection: TextDirection.ltr);
+    return new Text('Bang $_count!', textDirection: TextDirection.ltr);
   }
 }
 

packages/flutter/test/widgets/list_view_viewporting_test.dart

@@ -25,7 +25,7 @@ void main() {
               return new Container(
                 key: new ValueKey<int>(index),
                 height: 100.0,
-                child: new Text("$index"),
+                child: new Text('$index'),
               );
             },
           ),

packages/flutter/test/widgets/navigator_replacement_test.dart

@@ -8,10 +8,10 @@ import 'package:flutter/material.dart';
 void main() {
   testWidgets('Back during pushReplacement', (WidgetTester tester) async {
     await tester.pumpWidget(new MaterialApp(
-      home: const Material(child: const Text("home")),
+      home: const Material(child: const Text('home')),
       routes: <String, WidgetBuilder> {
-        '/a': (BuildContext context) => const Material(child: const Text("a")),
-        '/b': (BuildContext context) => const Material(child: const Text("b")),
+        '/a': (BuildContext context) => const Material(child: const Text('a')),
+        '/b': (BuildContext context) => const Material(child: const Text('b')),
       },
     ));
 
@@ -41,10 +41,10 @@ void main() {
 
   testWidgets('pushAndRemoveUntil', (WidgetTester tester) async {
     await tester.pumpWidget(new MaterialApp(
-      home: const Material(child: const Text("home")),
+      home: const Material(child: const Text('home')),
       routes: <String, WidgetBuilder> {
-        '/a': (BuildContext context) => const Material(child: const Text("a")),
-        '/b': (BuildContext context) => const Material(child: const Text("b")),
+        '/a': (BuildContext context) => const Material(child: const Text('a')),
+        '/b': (BuildContext context) => const Material(child: const Text('b')),
       },
     ));
 

packages/flutter/test/widgets/navigator_test.dart

@@ -334,7 +334,7 @@ void main() {
     expect(isPopped, isTrue);
   });
 
-  testWidgets("Add and remove an observer should work", (WidgetTester tester) async {
+  testWidgets('Add and remove an observer should work', (WidgetTester tester) async {
     final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{
        '/': (BuildContext context) => new OnTapPage(id: '/', onTap: () { Navigator.pushNamed(context, '/A'); }),
       '/A': (BuildContext context) => new OnTapPage(id: 'A', onTap: () { Navigator.pop(context); }),

packages/flutter/test/widgets/reparent_state_test.dart

@@ -72,13 +72,13 @@ void main() {
     );
 
     final StateMarkerState leftState = left.currentState;
-    leftState.marker = "left";
+    leftState.marker = 'left';
     final StateMarkerState rightState = right.currentState;
-    rightState.marker = "right";
+    rightState.marker = 'right';
 
     final StateMarkerState grandchildState = tester.state(find.byWidget(grandchild));
     expect(grandchildState, isNotNull);
-    grandchildState.marker = "grandchild";
+    grandchildState.marker = 'grandchild';
 
     final StateMarker newGrandchild = const StateMarker();
     await tester.pumpWidget(
@@ -99,14 +99,14 @@ void main() {
     );
 
     expect(left.currentState, equals(leftState));
-    expect(leftState.marker, equals("left"));
+    expect(leftState.marker, equals('left'));
     expect(right.currentState, equals(rightState));
-    expect(rightState.marker, equals("right"));
+    expect(rightState.marker, equals('right'));
 
     final StateMarkerState newGrandchildState = tester.state(find.byWidget(newGrandchild));
     expect(newGrandchildState, isNotNull);
     expect(newGrandchildState, equals(grandchildState));
-    expect(newGrandchildState.marker, equals("grandchild"));
+    expect(newGrandchildState.marker, equals('grandchild'));
 
     await tester.pumpWidget(
       new Center(
@@ -120,7 +120,7 @@ void main() {
     );
 
     expect(left.currentState, equals(leftState));
-    expect(leftState.marker, equals("left"));
+    expect(leftState.marker, equals('left'));
     expect(right.currentState, isNull);
   });
 
@@ -143,13 +143,13 @@ void main() {
     );
 
     final StateMarkerState leftState = left.currentState;
-    leftState.marker = "left";
+    leftState.marker = 'left';
     final StateMarkerState rightState = right.currentState;
-    rightState.marker = "right";
+    rightState.marker = 'right';
 
     final StateMarkerState grandchildState = tester.state(find.byWidget(grandchild));
     expect(grandchildState, isNotNull);
-    grandchildState.marker = "grandchild";
+    grandchildState.marker = 'grandchild';
 
     final StateMarker newGrandchild = const StateMarker();
     await tester.pumpWidget(
@@ -166,14 +166,14 @@ void main() {
     );
 
     expect(left.currentState, equals(leftState));
-    expect(leftState.marker, equals("left"));
+    expect(leftState.marker, equals('left'));
     expect(right.currentState, equals(rightState));
-    expect(rightState.marker, equals("right"));
+    expect(rightState.marker, equals('right'));
 
     final StateMarkerState newGrandchildState = tester.state(find.byWidget(newGrandchild));
     expect(newGrandchildState, isNotNull);
     expect(newGrandchildState, equals(grandchildState));
-    expect(newGrandchildState.marker, equals("grandchild"));
+    expect(newGrandchildState.marker, equals('grandchild'));
 
     await tester.pumpWidget(
       new Center(
@@ -187,7 +187,7 @@ void main() {
     );
 
     expect(left.currentState, equals(leftState));
-    expect(leftState.marker, equals("left"));
+    expect(leftState.marker, equals('left'));
     expect(right.currentState, isNull);
   });
 
@@ -197,7 +197,7 @@ void main() {
     await tester.pumpWidget(new StateMarker(key: key));
 
     final StateMarkerState keyState = key.currentState;
-    keyState.marker = "marked";
+    keyState.marker = 'marked';
 
     await tester.pumpWidget(
       new Directionality(
@@ -216,12 +216,12 @@ void main() {
     );
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
 
     await tester.pumpWidget(new StateMarker(key: key));
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
   });
 
   testWidgets('Reparent during update children', (WidgetTester tester) async {
@@ -236,7 +236,7 @@ void main() {
     ));
 
     final StateMarkerState keyState = key.currentState;
-    keyState.marker = "marked";
+    keyState.marker = 'marked';
 
     await tester.pumpWidget(new Stack(
       textDirection: TextDirection.ltr,
@@ -247,7 +247,7 @@ void main() {
     ));
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
 
     await tester.pumpWidget(new Stack(
       textDirection: TextDirection.ltr,
@@ -258,7 +258,7 @@ void main() {
     ));
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
   });
 
   testWidgets('Reparent to child during update children', (WidgetTester tester) async {
@@ -274,7 +274,7 @@ void main() {
     ));
 
     final StateMarkerState keyState = key.currentState;
-    keyState.marker = "marked";
+    keyState.marker = 'marked';
 
     await tester.pumpWidget(new Stack(
       textDirection: TextDirection.ltr,
@@ -285,7 +285,7 @@ void main() {
     ));
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
 
     await tester.pumpWidget(new Stack(
       textDirection: TextDirection.ltr,
@@ -297,7 +297,7 @@ void main() {
     ));
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
 
     await tester.pumpWidget(new Stack(
       textDirection: TextDirection.ltr,
@@ -308,7 +308,7 @@ void main() {
     ));
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
 
     await tester.pumpWidget(new Stack(
       textDirection: TextDirection.ltr,
@@ -320,7 +320,7 @@ void main() {
     ));
 
     expect(key.currentState, equals(keyState));
-    expect(keyState.marker, equals("marked"));
+    expect(keyState.marker, equals('marked'));
   });
 
   testWidgets('Deactivate implies build', (WidgetTester tester) async {

packages/flutter/test/widgets/scroll_view_test.dart

@@ -373,7 +373,7 @@ void main() {
     expect(scrolled, isFalse);
   });
 
-  testWidgets('physics:AlwaysScrollableScrollPhysics actually overrides primary:false default behaviour', (WidgetTester tester) async {
+  testWidgets('physics:AlwaysScrollableScrollPhysics actually overrides primary:false default behavior', (WidgetTester tester) async {
     bool scrolled = false;
     await tester.pumpWidget(
       new Directionality(
@@ -392,7 +392,7 @@ void main() {
     expect(scrolled, isTrue);
   });
 
-  testWidgets('physics:ScrollPhysics actually overrides primary:true default behaviour', (WidgetTester tester) async {
+  testWidgets('physics:ScrollPhysics actually overrides primary:true default behavior', (WidgetTester tester) async {
     bool scrolled = false;
     await tester.pumpWidget(
       new Directionality(

packages/flutter/test/widgets/scrollable_of_test.dart

@@ -24,7 +24,7 @@ class _ScrollPositionListenerState extends State<ScrollPositionListener> {
     _position?.removeListener(listener);
     _position = Scrollable.of(context)?.position;
     _position?.addListener(listener);
-    widget.log("didChangeDependencies ${_position?.pixels}");
+    widget.log('didChangeDependencies ${_position?.pixels}');
   }
 
   @override
@@ -37,7 +37,7 @@ class _ScrollPositionListenerState extends State<ScrollPositionListener> {
   Widget build(BuildContext context) => widget.child;
 
   void listener() {
-    widget.log("listener ${_position?.pixels}");
+    widget.log('listener ${_position?.pixels}');
   }
 
 }
@@ -62,24 +62,24 @@ void main() {
     }
 
     await tester.pumpWidget(buildFrame(null));
-    expect(logValue, "didChangeDependencies 0.0");
+    expect(logValue, 'didChangeDependencies 0.0');
 
     controller.jumpTo(100.0);
-    expect(logValue, "listener 100.0");
+    expect(logValue, 'listener 100.0');
 
     await tester.pumpWidget(buildFrame(const ClampingScrollPhysics()));
-    expect(logValue, "didChangeDependencies 100.0");
+    expect(logValue, 'didChangeDependencies 100.0');
 
     controller.jumpTo(200.0);
-    expect(logValue, "listener 200.0");
+    expect(logValue, 'listener 200.0');
 
     controller.jumpTo(300.0);
-    expect(logValue, "listener 300.0");
+    expect(logValue, 'listener 300.0');
 
     await tester.pumpWidget(buildFrame(const BouncingScrollPhysics()));
-    expect(logValue, "didChangeDependencies 300.0");
+    expect(logValue, 'didChangeDependencies 300.0');
 
     controller.jumpTo(400.0);
-    expect(logValue, "listener 400.0");
+    expect(logValue, 'listener 400.0');
   });
 }

packages/flutter/test/widgets/semantics_11_test.dart

@@ -71,7 +71,7 @@ class RenderTest extends RenderProxyBox {
 
   void _annotate(SemanticsNode node) {
     labelWasReset.add(node.label == '');
-    node.label = "Label ${labelWasReset.length}";
+    node.label = 'Label ${labelWasReset.length}';
     node.textDirection = TextDirection.ltr;
   }
 }

packages/flutter/test/widgets/stack_test.dart

@@ -388,7 +388,7 @@ void main() {
             children: <Widget>[
               new GestureDetector(
                 behavior: HitTestBehavior.opaque,
-                onTap: () { print("HELLO"); tapped = true; },
+                onTap: () { tapped = true; },
                 child: const SizedBox(
                   width: 200.0,
                   height: 200.0,