prefer const constructors (#8024)

packages/flutter/test/animation/curves_test.dart

@@ -13,7 +13,7 @@ void main() {
     expect(Curves.linear, hasOneLineDescription);
     expect(const SawTooth(3), hasOneLineDescription);
     expect(const Interval(0.25, 0.75), hasOneLineDescription);
-    expect(new Interval(0.25, 0.75, curve: Curves.ease), hasOneLineDescription);
+    expect(const Interval(0.25, 0.75, curve: Curves.ease), hasOneLineDescription);
   });
 
   test('Curve flipped control test', () {

packages/flutter/test/material/about_test.dart

@@ -22,7 +22,7 @@ void main() {
               children: <Widget>[
                 new AboutDrawerItem(
                   applicationVersion: '0.1.2',
-                  applicationIcon: new FlutterLogo(),
+                  applicationIcon: const FlutterLogo(),
                   applicationLegalese: 'I am the very model of a modern major general.',
                   aboutBoxChildren: <Widget>[
                     new Text('About box'),
@@ -90,7 +90,7 @@ void main() {
     });
 
     await tester.pumpWidget(new Center(
-      child: new LicensePage()
+      child: const LicensePage()
     ));
 
     expect(licenseFuture, isNotNull);

packages/flutter/test/material/image_icon_test.dart

@@ -29,7 +29,7 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new IconTheme(
-          data: new IconThemeData(opacity: 0.5),
+          data: const IconThemeData(opacity: 0.5),
           child: const ImageIcon(_kImage),
         ),
       ),

packages/flutter/test/material/scrollbar_paint_test.dart

@@ -11,7 +11,7 @@ void main() {
   testWidgets('Viewport2 basic test', (WidgetTester tester) async {
     await tester.pumpWidget(new Scrollbar2(
       child: new SingleChildScrollView(
-        child: new SizedBox(width: 4000.0, height: 4000.0),
+        child: const SizedBox(width: 4000.0, height: 4000.0),
       ),
     ));
     expect(find.byType(Scrollbar2), isNot(paints..rect()));

packages/flutter/test/material/slider_test.dart

@@ -152,7 +152,7 @@ void main() {
 
     expect(value, equals(0.5));
 
-    await gesture.moveBy(new Offset(1.0, 0.0));
+    await gesture.moveBy(const Offset(1.0, 0.0));
 
     expect(value, greaterThan(0.5));
 

packages/flutter/test/painting/colors_test.dart

@@ -10,7 +10,7 @@ void main() {
     const HSVColor color = const HSVColor.fromAHSV(0.7, 28.0, 0.3, 0.6);
 
     expect(color, hasOneLineDescription);
-    expect(color.hashCode, equals(new HSVColor.fromAHSV(0.7, 28.0, 0.3, 0.6).hashCode));
+    expect(color.hashCode, equals(const HSVColor.fromAHSV(0.7, 28.0, 0.3, 0.6).hashCode));
 
     expect(color.withAlpha(0.8), const HSVColor.fromAHSV(0.8, 28.0, 0.3, 0.6));
     expect(color.withHue(123.0), const HSVColor.fromAHSV(0.7, 123.0, 0.3, 0.6));

packages/flutter/test/painting/decoration_test.dart

@@ -195,7 +195,7 @@ void main() {
     }
 
     testDecoration(shape: BoxShape.circle, expectClip: true);
-    testDecoration(borderRadius: new BorderRadius.all(const Radius.circular(16.0)), expectClip: true);
+    testDecoration(borderRadius: const BorderRadius.all(const Radius.circular(16.0)), expectClip: true);
     testDecoration(expectClip: false);
   });
 }

packages/flutter/test/painting/edge_insets_test.dart

@@ -10,7 +10,7 @@ void main() {
     const EdgeInsets insets = const EdgeInsets.fromLTRB(5.0, 7.0, 11.0, 13.0);
 
     expect(insets, hasOneLineDescription);
-    expect(insets.hashCode, equals(new EdgeInsets.fromLTRB(5.0, 7.0, 11.0, 13.0).hashCode));
+    expect(insets.hashCode, equals(const EdgeInsets.fromLTRB(5.0, 7.0, 11.0, 13.0).hashCode));
 
     expect(insets.topLeft, const Offset(5.0, 7.0));
     expect(insets.topRight, const Offset(-11.0, 7.0));

packages/flutter/test/painting/fractional_offset_test.dart

@@ -10,7 +10,7 @@ void main() {
     const FractionalOffset offset = const FractionalOffset(0.5, 0.25);
 
     expect(offset, hasOneLineDescription);
-    expect(offset.hashCode, equals(new FractionalOffset(0.5, 0.25).hashCode));
+    expect(offset.hashCode, equals(const FractionalOffset(0.5, 0.25).hashCode));
 
     expect(offset / 2.0, const FractionalOffset(0.25, 0.125));
     expect(offset ~/ 2.0, const FractionalOffset(0.0, 0.0));
@@ -20,7 +20,7 @@ void main() {
   test('FractionalOffset.lerp()', () {
     FractionalOffset a = FractionalOffset.topLeft;
     FractionalOffset b = FractionalOffset.topCenter;
-    expect(FractionalOffset.lerp(a, b, 0.25), equals(new FractionalOffset(0.125, 0.0)));
+    expect(FractionalOffset.lerp(a, b, 0.25), equals(const FractionalOffset(0.125, 0.0)));
 
     expect(FractionalOffset.lerp(null, null, 0.25), isNull);
     expect(FractionalOffset.lerp(null, b, 0.25), equals(b * 0.25));

packages/flutter/test/painting/text_painter_test.dart

@@ -16,7 +16,7 @@ void main() {
     painter.text = new TextSpan(text: text);
     painter.layout();
 
-    Offset caretOffset = painter.getOffsetForCaret(new ui.TextPosition(offset: 0), ui.Rect.zero);
+    Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero);
     expect(caretOffset.dx, 0);
     caretOffset = painter.getOffsetForCaret(new ui.TextPosition(offset: text.length), ui.Rect.zero);
     expect(caretOffset.dx, painter.width);

packages/flutter/test/painting/text_span_test.dart

@@ -8,12 +8,12 @@ import 'package:test/test.dart';
 
 void main() {
   test('TextSpan equals', () {
-    TextSpan a1 = new TextSpan(text: 'a'); // ignore: prefer_const_constructor
-    TextSpan a2 = new TextSpan(text: 'a'); // ignore: prefer_const_constructor
+    TextSpan a1 = new TextSpan(text: 'a'); // ignore: prefer_const_constructors
+    TextSpan a2 = new TextSpan(text: 'a'); // ignore: prefer_const_constructors
     TextSpan b1 = new TextSpan(children: <TextSpan>[ a1 ]);
     TextSpan b2 = new TextSpan(children: <TextSpan>[ a2 ]);
-    TextSpan c1 = new TextSpan(); // ignore: prefer_const_constructor
-    TextSpan c2 = new TextSpan(); // ignore: prefer_const_constructor
+    TextSpan c1 = new TextSpan(); // ignore: prefer_const_constructors
+    TextSpan c2 = new TextSpan(); // ignore: prefer_const_constructors
 
     expect(a1 == a2, isTrue);
     expect(b1 == b2, isTrue);

packages/flutter/test/rendering/constraints_test.dart

@@ -36,7 +36,7 @@ void main() {
 
     result = 'no exception';
     try {
-      BoxConstraints constraints = new BoxConstraints(minWidth: double.NAN, maxWidth: double.NAN, minHeight: 2.0, maxHeight: double.NAN);
+      BoxConstraints constraints = const BoxConstraints(minWidth: double.NAN, maxWidth: double.NAN, minHeight: 2.0, maxHeight: double.NAN);
       assert(constraints.debugAssertIsValid());
     } on FlutterError catch (e) {
       result = '$e';
@@ -49,7 +49,7 @@ void main() {
 
     result = 'no exception';
     try {
-      BoxConstraints constraints = new BoxConstraints(minHeight: double.NAN);
+      BoxConstraints constraints = const BoxConstraints(minHeight: double.NAN);
       assert(constraints.debugAssertIsValid());
     } on FlutterError catch (e) {
       result = '$e';
@@ -62,7 +62,7 @@ void main() {
 
     result = 'no exception';
     try {
-      BoxConstraints constraints = new BoxConstraints(minHeight: double.NAN, maxWidth: 0.0/0.0);
+      BoxConstraints constraints = const BoxConstraints(minHeight: double.NAN, maxWidth: 0.0/0.0);
       assert(constraints.debugAssertIsValid());
     } on FlutterError catch (e) {
       result = '$e';

packages/flutter/test/rendering/debug_test.dart

@@ -41,10 +41,10 @@ void main() {
       offset: new ViewportOffset.zero(),
       children: <RenderSliver>[
         s = new RenderSliverPadding(
-          padding: new EdgeInsets.all(10.0),
+          padding: const EdgeInsets.all(10.0),
           child: new RenderSliverToBoxAdapter(
             child: b = new RenderPadding(
-              padding: new EdgeInsets.all(10.0),
+              padding: const EdgeInsets.all(10.0),
             ),
           ),
         ),
@@ -63,12 +63,12 @@ void main() {
     debugPaintSizeEnabled = true;
     RenderSliver s;
     RenderBox b = new RenderPadding(
-      padding: new EdgeInsets.all(10.0),
+      padding: const EdgeInsets.all(10.0),
       child: new RenderViewport2(
         offset: new ViewportOffset.zero(),
         children: <RenderSliver>[
           s = new RenderSliverPadding(
-            padding: new EdgeInsets.all(10.0),
+            padding: const EdgeInsets.all(10.0),
           ),
         ],
       ),

packages/flutter/test/rendering/paragraph_test.dart

@@ -13,69 +13,69 @@ const String _kText = 'I polished up that handle so carefullee\nThat now I am th
 
 void main() {
   test('getOffsetForCaret control test', () {
-    RenderParagraph paragraph = new RenderParagraph(new TextSpan(text: _kText));
+    RenderParagraph paragraph = new RenderParagraph(const TextSpan(text: _kText));
     layout(paragraph);
 
     Rect caret = new Rect.fromLTWH(0.0, 0.0, 2.0, 20.0);
 
-    Offset offset5 = paragraph.getOffsetForCaret(new TextPosition(offset: 5), caret);
+    Offset offset5 = paragraph.getOffsetForCaret(const TextPosition(offset: 5), caret);
     expect(offset5.dx, greaterThan(0.0));
 
-    Offset offset25 = paragraph.getOffsetForCaret(new TextPosition(offset: 25), caret);
+    Offset offset25 = paragraph.getOffsetForCaret(const TextPosition(offset: 25), caret);
     expect(offset25.dx, greaterThan(offset5.dx));
 
-    Offset offset50 = paragraph.getOffsetForCaret(new TextPosition(offset: 50), caret);
+    Offset offset50 = paragraph.getOffsetForCaret(const TextPosition(offset: 50), caret);
     expect(offset50.dy, greaterThan(offset5.dy));
   });
 
   test('getPositionForOffset control test', () {
-    RenderParagraph paragraph = new RenderParagraph(new TextSpan(text: _kText));
+    RenderParagraph paragraph = new RenderParagraph(const TextSpan(text: _kText));
     layout(paragraph);
 
-    TextPosition position20 = paragraph.getPositionForOffset(new Offset(20.0, 5.0));
+    TextPosition position20 = paragraph.getPositionForOffset(const Offset(20.0, 5.0));
     expect(position20.offset, greaterThan(0.0));
 
-    TextPosition position40 = paragraph.getPositionForOffset(new Offset(40.0, 5.0));
+    TextPosition position40 = paragraph.getPositionForOffset(const Offset(40.0, 5.0));
     expect(position40.offset, greaterThan(position20.offset));
 
-    TextPosition positionBelow = paragraph.getPositionForOffset(new Offset(5.0, 20.0));
+    TextPosition positionBelow = paragraph.getPositionForOffset(const Offset(5.0, 20.0));
     expect(positionBelow.offset, greaterThan(position40.offset));
   });
 
   test('getBoxesForSelection control test', () {
-    RenderParagraph paragraph = new RenderParagraph(new TextSpan(text: _kText));
+    RenderParagraph paragraph = new RenderParagraph(const TextSpan(text: _kText));
     layout(paragraph);
 
     List<ui.TextBox> boxes = paragraph.getBoxesForSelection(
-      new TextSelection(baseOffset: 5, extentOffset: 25)
+        const TextSelection(baseOffset: 5, extentOffset: 25)
     );
 
     expect(boxes.length, equals(1));
 
     boxes = paragraph.getBoxesForSelection(
-      new TextSelection(baseOffset: 25, extentOffset: 50)
+        const TextSelection(baseOffset: 25, extentOffset: 50)
     );
 
     expect(boxes.length, equals(3));
   });
 
   test('getWordBoundary control test', () {
-    RenderParagraph paragraph = new RenderParagraph(new TextSpan(text: _kText));
+    RenderParagraph paragraph = new RenderParagraph(const TextSpan(text: _kText));
     layout(paragraph);
 
-    TextRange range5 = paragraph.getWordBoundary(new TextPosition(offset: 5));
+    TextRange range5 = paragraph.getWordBoundary(const TextPosition(offset: 5));
     expect(range5.textInside(_kText), equals('polished'));
 
-    TextRange range50 = paragraph.getWordBoundary(new TextPosition(offset: 50));
+    TextRange range50 = paragraph.getWordBoundary(const TextPosition(offset: 50));
     expect(range50.textInside(_kText), equals(' '));
 
-    TextRange range85 = paragraph.getWordBoundary(new TextPosition(offset: 75));
+    TextRange range85 = paragraph.getWordBoundary(const TextPosition(offset: 75));
     expect(range85.textInside(_kText), equals('Queen\'s'));
   });
 
   test('overflow test', () {
     RenderParagraph paragraph = new RenderParagraph(
-      new TextSpan(text: 'This is\na wrapping test. It should wrap at manual newlines, and if softWrap is true, also at spaces.'),
+      const TextSpan(text: 'This is\na wrapping test. It should wrap at manual newlines, and if softWrap is true, also at spaces.'),
       maxLines: 1,
       softWrap: true,
     );
@@ -89,7 +89,7 @@ void main() {
     }
 
     // Lay out in a narrow box to force wrapping.
-    layout(paragraph, constraints: new BoxConstraints(maxWidth: 50.0));
+    layout(paragraph, constraints: const BoxConstraints(maxWidth: 50.0));
     double lineHeight = paragraph.size.height;
 
     relayoutWith(maxLines: 3, softWrap: true, overflow: TextOverflow.clip);

packages/flutter/test/rendering/proxy_getters_and_setters_test.dart

@@ -8,10 +8,10 @@ import 'package:test/test.dart';
 
 void main() {
   test('RenderConstrainedBox getters and setters', () {
-    RenderConstrainedBox box = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(height: 10.0));
-    expect(box.additionalConstraints, new BoxConstraints(minHeight: 10.0, maxHeight: 10.0));
-    box.additionalConstraints = new BoxConstraints.tightFor(width: 10.0);
-    expect(box.additionalConstraints, new BoxConstraints(minWidth: 10.0, maxWidth: 10.0));
+    RenderConstrainedBox box = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(height: 10.0));
+    expect(box.additionalConstraints, const BoxConstraints(minHeight: 10.0, maxHeight: 10.0));
+    box.additionalConstraints = const BoxConstraints.tightFor(width: 10.0);
+    expect(box.additionalConstraints, const BoxConstraints(minWidth: 10.0, maxWidth: 10.0));
   });
 
   test('RenderLimitedBox getters and setters', () {

packages/flutter/test/rendering/semantics_and_children_test.dart

@@ -16,7 +16,7 @@ int countSemanticsChildren(RenderObject object) {
     
 void main() {
   test('RenderOpacity and children and semantics', () {
-    RenderOpacity box = new RenderOpacity(child: new RenderParagraph(new TextSpan()));
+    RenderOpacity box = new RenderOpacity(child: new RenderParagraph(const TextSpan()));
     expect(countSemanticsChildren(box), 1);
     box.opacity = 0.5;
     expect(countSemanticsChildren(box), 1);

packages/flutter/test/rendering/slivers_helpers_test.dart

@@ -17,7 +17,7 @@ void main() {
   });
 
   test('SliverConstraints', () {
-    SliverConstraints a = new SliverConstraints(
+    SliverConstraints a = const SliverConstraints(
       axisDirection: AxisDirection.down,
       growthDirection: GrowthDirection.forward,
       userScrollDirection: ScrollDirection.idle,
@@ -44,7 +44,7 @@ void main() {
       crossAxisExtent: 40.0,
       viewportMainAxisExtent: 30.0,
     );
-    SliverConstraints d = new SliverConstraints(
+    SliverConstraints d = const SliverConstraints(
       axisDirection: AxisDirection.up,
       growthDirection: GrowthDirection.reverse,
       userScrollDirection: ScrollDirection.forward,
@@ -69,12 +69,12 @@ void main() {
   });
 
   test('SliverGeometry', () {
-    expect(new SliverGeometry().debugAssertIsValid, isTrue);
+    expect(const SliverGeometry().debugAssertIsValid, isTrue);
     expect(() {
-      new SliverGeometry(layoutExtent: 10.0, paintExtent: 9.0).debugAssertIsValid;
+      const SliverGeometry(layoutExtent: 10.0, paintExtent: 9.0).debugAssertIsValid;
     }, throwsFlutterError);
     expect(() {
-      new SliverGeometry(paintExtent: 9.0, maxPaintExtent: 8.0).debugAssertIsValid;
+      const SliverGeometry(paintExtent: 9.0, maxPaintExtent: 8.0).debugAssertIsValid;
     }, throwsFlutterError);
   });
 }

packages/flutter/test/services/system_chrome_test.dart

@@ -42,7 +42,7 @@ void main() {
     });
 
     await SystemChrome.setApplicationSwitcherDescription(
-      new ApplicationSwitcherDescription(label: 'Example label', primaryColor: 0xFF00FF00)
+        const ApplicationSwitcherDescription(label: 'Example label', primaryColor: 0xFF00FF00)
     );
 
     expect(log, equals(<String>['{"method":"SystemChrome.setApplicationSwitcherDescription","args":[{"label":"Example label","primaryColor":4278255360}]}']));

packages/flutter/test/widgets/animated_size_test.dart

@@ -183,7 +183,7 @@ void main() {
         child: new AnimatedSize(
           duration: const Duration(milliseconds: 200),
           vsync: const TestVSync(),
-          child: new SizedBox(
+          child: const SizedBox(
             width: 100.0,
             height: 100.0,
           ),
@@ -196,7 +196,7 @@ void main() {
         child: new AnimatedSize(
           duration: const Duration(milliseconds: 200),
           vsync: tester,
-          child: new SizedBox(
+          child: const SizedBox(
             width: 200.0,
             height: 100.0,
           ),

packages/flutter/test/widgets/flex_test.dart

@@ -52,7 +52,7 @@ void main() {
     await tester.pumpWidget(
       new Row(
         children: <Widget>[
-          new Flexible(child: new SizedBox(width: 100.0, height: 200.0)),
+          new Flexible(child: const SizedBox(width: 100.0, height: 200.0)),
         ],
       ),
     );

packages/flutter/test/widgets/grid_view_test.dart

@@ -192,7 +192,7 @@ void main() {
 
     await tester.pumpWidget(
       new GridView(
-        gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
+        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
           crossAxisCount: 4,
         ),
         children: new List<Widget>.generate(40, (int i) {
@@ -219,7 +219,7 @@ void main() {
 
     await tester.pumpWidget(
       new GridView(
-        gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
+        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
           crossAxisCount: 2,
         ),
         children: new List<Widget>.generate(40, (int i) {
@@ -251,7 +251,7 @@ void main() {
 
     await tester.pumpWidget(
       new GridView(
-        gridDelegate: new SliverGridDelegateWithMaxCrossAxisExtent(
+        gridDelegate: const SliverGridDelegateWithMaxCrossAxisExtent(
           maxCrossAxisExtent: 200.0,
         ),
         children: new List<Widget>.generate(40, (int i) {
@@ -278,7 +278,7 @@ void main() {
 
     await tester.pumpWidget(
       new GridView(
-        gridDelegate: new SliverGridDelegateWithMaxCrossAxisExtent(
+        gridDelegate: const SliverGridDelegateWithMaxCrossAxisExtent(
           maxCrossAxisExtent: 400.0,
         ),
         children: new List<Widget>.generate(40, (int i) {

packages/flutter/test/widgets/key_test.dart

@@ -19,18 +19,18 @@ class NotEquals {
 
 void main() {
   testWidgets('Keys', (WidgetTester tester) async {
-    expect(new ValueKey<int>(3) == new ValueKey<int>(3), isTrue);
-    expect(new ValueKey<num>(3) == new ValueKey<int>(3), isFalse);
-    expect(new ValueKey<int>(3) == new ValueKey<int>(2), isFalse);
+    expect(new ValueKey<int>(3) == new ValueKey<int>(3), isTrue); // ignore: prefer_const_constructors
+    expect(new ValueKey<num>(3) == new ValueKey<int>(3), isFalse); // ignore: prefer_const_constructors
+    expect(new ValueKey<int>(3) == new ValueKey<int>(2), isFalse); // ignore: prefer_const_constructors
     expect(const ValueKey<double>(double.NAN) == const ValueKey<double>(double.NAN), isFalse);
     
-    expect(new Key('') == new ValueKey<String>(''), isTrue);
-    expect(new ValueKey<String>('') == new ValueKey<String>(''), isTrue);
-    expect(new TestValueKey<String>('') == new ValueKey<String>(''), isFalse);
-    expect(new TestValueKey<String>('') == new TestValueKey<String>(''), isTrue);
+    expect(new Key('') == new ValueKey<String>(''), isTrue); // ignore: prefer_const_constructors
+    expect(new ValueKey<String>('') == new ValueKey<String>(''), isTrue); // ignore: prefer_const_constructors
+    expect(new TestValueKey<String>('') == new ValueKey<String>(''), isFalse); // ignore: prefer_const_constructors
+    expect(new TestValueKey<String>('') == new TestValueKey<String>(''), isTrue); // ignore: prefer_const_constructors
 
-    expect(new ValueKey<String>('') == new ValueKey<dynamic>(''), isFalse);
-    expect(new TestValueKey<String>('') == new TestValueKey<dynamic>(''), isFalse);
+    expect(new ValueKey<String>('') == new ValueKey<dynamic>(''), isFalse); // ignore: prefer_const_constructors
+    expect(new TestValueKey<String>('') == new TestValueKey<dynamic>(''), isFalse); // ignore: prefer_const_constructors
     
     expect(new UniqueKey() == new UniqueKey(), isFalse);
     LocalKey k = new UniqueKey();
@@ -41,10 +41,10 @@ void main() {
     expect(new ValueKey<LocalKey>(k) == new ValueKey<UniqueKey>(k), isFalse);
     expect(new ObjectKey(k) == new ObjectKey(k), isTrue);
 
-    expect(new ValueKey<NotEquals>(const NotEquals()) == new ValueKey<NotEquals>(const NotEquals()), isFalse);
-    expect(new ObjectKey(const NotEquals()) == new ObjectKey(const NotEquals()), isTrue);
+    expect(new ValueKey<NotEquals>(const NotEquals()) == new ValueKey<NotEquals>(const NotEquals()), isFalse); // ignore: prefer_const_constructors
+    expect(new ObjectKey(const NotEquals()) == new ObjectKey(const NotEquals()), isTrue); // ignore: prefer_const_constructors
     
-    expect(new ObjectKey(const Object()) == new ObjectKey(const Object()), isTrue);
+    expect(new ObjectKey(const Object()) == new ObjectKey(const Object()), isTrue); // ignore: prefer_const_constructors
     expect(new ObjectKey(new Object()) == new ObjectKey(new Object()), isFalse);
 
     expect(new ValueKey<bool>(true), hasOneLineDescription);

packages/flutter/test/widgets/notification_test.dart

@@ -66,6 +66,6 @@ void main() {
       onNotification: (MyNotification value) { },
       child: new Container(key: key),
     ));
-    expect(() { new MyNotification().dispatch(key.currentContext); }, throwsA(new isInstanceOf<AssertionError>()));
+    expect(() { new MyNotification().dispatch(key.currentContext); }, throwsA(const isInstanceOf<AssertionError>()));
   });
 }

packages/flutter/test/widgets/overscroll_indicator_test.dart

@@ -26,7 +26,7 @@ void main() {
     await tester.pumpWidget(
       new CustomScrollView(
         slivers: <Widget>[
-          new SliverToBoxAdapter(child: new SizedBox(height: 2000.0)),
+          new SliverToBoxAdapter(child: const SizedBox(height: 2000.0)),
         ],
       ),
     );
@@ -59,7 +59,7 @@ void main() {
     await tester.pumpWidget(
       new CustomScrollView(
         slivers: <Widget>[
-          new SliverToBoxAdapter(child: new SizedBox(height: 2000.0)),
+          new SliverToBoxAdapter(child: const SizedBox(height: 2000.0)),
         ],
       ),
     );
@@ -94,7 +94,7 @@ void main() {
     await tester.pumpWidget(
       new CustomScrollView(
         slivers: <Widget>[
-          new SliverToBoxAdapter(child: new SizedBox(height: 2000.0)),
+          new SliverToBoxAdapter(child: const SizedBox(height: 2000.0)),
         ],
       ),
     );
@@ -127,7 +127,7 @@ void main() {
       await tester.pumpWidget(
         new CustomScrollView(
           slivers: <Widget>[
-            new SliverToBoxAdapter(child: new SizedBox(height: 20.0)),
+            new SliverToBoxAdapter(child: const SizedBox(height: 20.0)),
           ],
         ),
       );
@@ -144,7 +144,7 @@ void main() {
         new CustomScrollView(
           reverse: true,
           slivers: <Widget>[
-            new SliverToBoxAdapter(child: new SizedBox(height: 20.0)),
+            new SliverToBoxAdapter(child: const SizedBox(height: 20.0)),
           ],
         ),
       );
@@ -161,7 +161,7 @@ void main() {
     await tester.pumpWidget(
       new CustomScrollView(
         slivers: <Widget>[
-          new SliverToBoxAdapter(child: new SizedBox(height: 20.0)),
+          new SliverToBoxAdapter(child: const SizedBox(height: 20.0)),
         ],
       ),
     );
@@ -181,7 +181,7 @@ void main() {
       new CustomScrollView(
         scrollDirection: Axis.horizontal,
         slivers: <Widget>[
-          new SliverToBoxAdapter(child: new SizedBox(height: 20.0)),
+          new SliverToBoxAdapter(child: const SizedBox(height: 20.0)),
         ],
       ),
     );
@@ -230,7 +230,7 @@ void main() {
           scrollDirection: Axis.horizontal,
           reverse: true,
           slivers: <Widget>[
-            new SliverToBoxAdapter(child: new SizedBox(height: 20.0)),
+            new SliverToBoxAdapter(child: const SizedBox(height: 20.0)),
           ],
         ),
       ),
@@ -247,7 +247,7 @@ void main() {
         child: new CustomScrollView(
           scrollDirection: Axis.horizontal,
           slivers: <Widget>[
-            new SliverToBoxAdapter(child: new SizedBox(height: 20.0)),
+            new SliverToBoxAdapter(child: const SizedBox(height: 20.0)),
           ],
         ),
       ),

packages/flutter/test/widgets/render_object_widget_test.dart

@@ -6,9 +6,9 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
-final BoxDecoration kBoxDecorationA = new BoxDecoration(); // ignore: prefer_const_constructor
-final BoxDecoration kBoxDecorationB = new BoxDecoration(); // ignore: prefer_const_constructor
-final BoxDecoration kBoxDecorationC = new BoxDecoration(); // ignore: prefer_const_constructor
+final BoxDecoration kBoxDecorationA = new BoxDecoration(); // ignore: prefer_const_constructors
+final BoxDecoration kBoxDecorationB = new BoxDecoration(); // ignore: prefer_const_constructors
+final BoxDecoration kBoxDecorationC = new BoxDecoration(); // ignore: prefer_const_constructors
 
 class TestWidget extends StatelessWidget {
   const TestWidget({ this.child });

packages/flutter/test/widgets/scrollable_custom_scroll_behavior_test.dart

@@ -121,7 +121,7 @@ void main() {
       child: new CustomScrollView(
         controller: new TestScrollController(),
         slivers: <Widget>[
-          new SliverToBoxAdapter(child: new SizedBox(height: 2000.0)),
+          new SliverToBoxAdapter(child: const SizedBox(height: 2000.0)),
         ],
       ),
     ));
@@ -133,7 +133,7 @@ void main() {
       child: new CustomScrollView(
         controller: new TestScrollController(),
         slivers: <Widget>[
-          new SliverToBoxAdapter(child: new SizedBox(height: 2000.0)),
+          new SliverToBoxAdapter(child: const SizedBox(height: 2000.0)),
         ],
       ),
     ));

packages/flutter/test/widgets/scrollable_test.dart

@@ -13,7 +13,7 @@ Future<Null> pumpTest(WidgetTester tester, TargetPlatform platform) async {
     ),
     home: new CustomScrollView(
       slivers: <Widget>[
-        new SliverToBoxAdapter(child: new SizedBox(height: 2000.0)),
+        new SliverToBoxAdapter(child: const SizedBox(height: 2000.0)),
       ],
     ),
   ));

packages/flutter/test/widgets/size_changed_layout_notification_test.dart

@@ -37,7 +37,7 @@ void main() {
       new Center(
         child: new NotificationListener<LayoutChangedNotification>(
           onNotification: (LayoutChangedNotification notification) {
-            expect(notification, new isInstanceOf<SizeChangedLayoutNotification>());
+            expect(notification, const isInstanceOf<SizeChangedLayoutNotification>());
             notified = true;
             return true;
           },

packages/flutter/test/widgets/slivers_appbar_floating_test.dart

@@ -8,7 +8,7 @@ import 'package:flutter/widgets.dart';
 
 void verifyPaintPosition(GlobalKey key, Offset ideal, bool visible) {
   RenderSliver target = key.currentContext.findRenderObject();
-  expect(target.parent, new isInstanceOf<RenderViewport2>());
+  expect(target.parent, const isInstanceOf<RenderViewport2>());
   SliverPhysicalParentData parentData = target.parentData;
   Offset actual = parentData.paintOffset;
   expect(actual, ideal);
@@ -63,58 +63,58 @@ void main() {
     );
     ScrollPosition position = tester.state<Scrollable2State>(find.byType(Scrollable2)).position;
 
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), true);
-    verifyPaintPosition(key2, new Offset(0.0, 600.0), false);
-    verifyPaintPosition(key3, new Offset(0.0, 600.0), false);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), true);
+    verifyPaintPosition(key2, const Offset(0.0, 600.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 600.0), false);
 
     position.animateTo(bigHeight - 600.0 + delegate.maxExtent, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), true);
     verifyPaintPosition(key2, new Offset(0.0, 600.0 - delegate.maxExtent), true);
     verifyActualBoxPosition(tester, find.byType(Container), 0, new Rect.fromLTWH(0.0, 600.0 - delegate.maxExtent, 800.0, delegate.maxExtent));
-    verifyPaintPosition(key3, new Offset(0.0, 600.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 600.0), false);
 
     assert(delegate.maxExtent * 2.0 < 600.0); // make sure this fits on the test screen...
     position.animateTo(bigHeight - 600.0 + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), true);
     verifyPaintPosition(key2, new Offset(0.0, 600.0 - delegate.maxExtent * 2.0), true);
     verifyActualBoxPosition(tester, find.byType(Container), 0, new Rect.fromLTWH(0.0, 600.0 - delegate.maxExtent * 2.0, 800.0, delegate.maxExtent));
     verifyPaintPosition(key3, new Offset(0.0, 600.0 - delegate.maxExtent), true);
 
     position.animateTo(bigHeight, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), true);
     verifyActualBoxPosition(tester, find.byType(Container), 0, new Rect.fromLTWH(0.0, 0.0, 800.0, delegate.maxExtent));
     verifyPaintPosition(key3, new Offset(0.0, delegate.maxExtent), true);
 
     position.animateTo(bigHeight + delegate.maxExtent * 0.1, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), true);
     verifyActualBoxPosition(tester, find.byType(Container), 0, new Rect.fromLTWH(0.0, 0.0, 800.0, delegate.maxExtent * 0.9));
     verifyPaintPosition(key3, new Offset(0.0, delegate.maxExtent * 0.9), true);
 
     position.animateTo(bigHeight + delegate.maxExtent * 0.5, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), true);
     verifyActualBoxPosition(tester, find.byType(Container), 0, new Rect.fromLTWH(0.0, 0.0, 800.0, delegate.maxExtent * 0.5));
     verifyPaintPosition(key3, new Offset(0.0, delegate.maxExtent * 0.5), true);
 
     position.animateTo(bigHeight + delegate.maxExtent * 0.9, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), true);
     verifyActualBoxPosition(tester, find.byType(Container), 0, new Rect.fromLTWH(0.0, -delegate.maxExtent * 0.4, 800.0, delegate.maxExtent * 0.5));
     verifyPaintPosition(key3, new Offset(0.0, delegate.maxExtent * 0.1), true);
 
     position.animateTo(bigHeight + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key3, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 0.0), true);
   });
 
   testWidgets('Sliver appbars - floating - no floating behavior when animating', (WidgetTester tester) async {
@@ -132,21 +132,21 @@ void main() {
     );
     ScrollPosition position = tester.state<Scrollable2State>(find.byType(Scrollable2)).position;
 
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), true);
-    verifyPaintPosition(key2, new Offset(0.0, 600.0), false);
-    verifyPaintPosition(key3, new Offset(0.0, 600.0), false);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), true);
+    verifyPaintPosition(key2, const Offset(0.0, 600.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 600.0), false);
 
     position.animateTo(bigHeight + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key3, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 0.0), true);
 
     position.animateTo(bigHeight + delegate.maxExtent * 1.9, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key3, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 0.0), true);
   });
 
   testWidgets('Sliver appbars - floating - floating behavior when dragging down', (WidgetTester tester) async {
@@ -164,23 +164,23 @@ void main() {
     );
     ScrollPosition position = tester.state<Scrollable2State>(find.byType(Scrollable2)).position;
 
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), true);
-    verifyPaintPosition(key2, new Offset(0.0, 600.0), false);
-    verifyPaintPosition(key3, new Offset(0.0, 600.0), false);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), true);
+    verifyPaintPosition(key2, const Offset(0.0, 600.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 600.0), false);
 
     position.animateTo(bigHeight + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1));
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key3, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key3, const Offset(0.0, 0.0), true);
 
     position.animateTo(bigHeight + delegate.maxExtent * 1.9, curve: Curves.linear, duration: const Duration(minutes: 1));
     position.updateUserScrollDirection(ScrollDirection.forward); // ignore: INVALID_USE_OF_PROTECTED_MEMBER, since this is using a protected method for testing purposes
     await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 1000));
-    verifyPaintPosition(key1, new Offset(0.0, 0.0), false);
-    verifyPaintPosition(key2, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key1, const Offset(0.0, 0.0), false);
+    verifyPaintPosition(key2, const Offset(0.0, 0.0), true);
     verifyActualBoxPosition(tester, find.byType(Container), 0, new Rect.fromLTWH(0.0, -delegate.maxExtent * 0.4, 800.0, delegate.maxExtent * 0.5));
-    verifyPaintPosition(key3, new Offset(0.0, 0.0), true);
+    verifyPaintPosition(key3, const Offset(0.0, 0.0), true);
   });
 }
 

packages/flutter/test/widgets/slivers_appbar_scrolling_test.dart

@@ -8,7 +8,7 @@ import 'package:flutter/widgets.dart';
 
 void verifyPaintPosition(GlobalKey key, Offset ideal) {
   RenderObject target = key.currentContext.findRenderObject();
-  expect(target.parent, new isInstanceOf<RenderViewport2>());
+  expect(target.parent, const isInstanceOf<RenderViewport2>());
   SliverPhysicalParentData parentData = target.parentData;
   Offset actual = parentData.paintOffset;
   expect(actual, ideal);
@@ -40,11 +40,11 @@ void main() {
     expect(position.pixels, max);
     expect(position.minScrollExtent, 0.0);
     expect(position.maxScrollExtent, max);
-    verifyPaintPosition(key1, new Offset(0.0, 0.0));
-    verifyPaintPosition(key2, new Offset(0.0, 0.0));
-    verifyPaintPosition(key3, new Offset(0.0, 0.0));
-    verifyPaintPosition(key4, new Offset(0.0, 0.0));
-    verifyPaintPosition(key5, new Offset(0.0, 50.0));
+    verifyPaintPosition(key1, const Offset(0.0, 0.0));
+    verifyPaintPosition(key2, const Offset(0.0, 0.0));
+    verifyPaintPosition(key3, const Offset(0.0, 0.0));
+    verifyPaintPosition(key4, const Offset(0.0, 0.0));
+    verifyPaintPosition(key5, const Offset(0.0, 50.0));
   });
 
   testWidgets('Sliver appbars - scrolling off screen', (WidgetTester tester) async {

packages/flutter/test/widgets/slivers_evil_test.dart

@@ -50,7 +50,7 @@ class TestScrollPhysics extends ClampingScrollPhysics {
   TestScrollPhysics applyTo(ScrollPhysics parent) => new TestScrollPhysics(parent: parent);
 
   @override
-  Tolerance get tolerance => new Tolerance(velocity: 20.0, distance: 1.0);
+  Tolerance get tolerance => const Tolerance(velocity: 20.0, distance: 1.0);
 }
 
 class TestViewportScrollPosition extends ScrollPosition {
@@ -92,7 +92,7 @@ void main() {
                   new SliverPersistentHeader(delegate: new TestSliverPersistentHeaderDelegate(150.0), pinned: true),
                   new SliverToBoxAdapter(child: new Container(height: 520.0)),
                   new SliverPadding(
-                    padding: new EdgeInsets.all(50.0),
+                    padding: const EdgeInsets.all(50.0),
                     child: new SliverToBoxAdapter(child: new Container(height: 520.0)),
                   ),
                   new SliverToBoxAdapter(child: new Container(height: 520.0)),
@@ -104,7 +104,7 @@ void main() {
                   new SliverToBoxAdapter(child: new Container(height: 520.0)),
                   new SliverToBoxAdapter(child: new Container(height: 520.0)),
                   new SliverPadding(
-                    padding: new EdgeInsets.all(50.0),
+                    padding: const EdgeInsets.all(50.0),
                     child: new SliverPersistentHeader(delegate: new TestSliverPersistentHeaderDelegate(250.0), pinned: true),
                   ),
                   new SliverToBoxAdapter(child: new Container(height: 520.0)),
@@ -145,7 +145,7 @@ void main() {
                   new SliverPersistentHeader(delegate: new TestSliverPersistentHeaderDelegate(250.0)),
                   new SliverPersistentHeader(delegate: new TestSliverPersistentHeaderDelegate(250.0)),
                   new SliverPadding(
-                    padding: new EdgeInsets.symmetric(horizontal: 50.0),
+                    padding: const EdgeInsets.symmetric(horizontal: 50.0),
                     child: new SliverToBoxAdapter(child: new Container(height: 520.0)),
                   ),
                   new SliverToBoxAdapter(child: new Container(height: 520.0)),

packages/flutter/test/widgets/slivers_padding_test.dart

@@ -85,11 +85,11 @@ void main() {
     result = tester.hitTestOnBinding(const Point(10.0, 10.0));
     expect(result.path.first.target, tester.firstRenderObject<RenderObject>(find.byType(Text)));
     result = tester.hitTestOnBinding(const Point(10.0, 60.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(100.0, 100.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).skip(1).first);
     result = tester.hitTestOnBinding(const Point(100.0, 490.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(10.0, 520.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).last);
   });
@@ -107,11 +107,11 @@ void main() {
     result = tester.hitTestOnBinding(const Point(10.0, 600.0-10.0));
     expect(result.path.first.target, tester.firstRenderObject<RenderObject>(find.byType(Text)));
     result = tester.hitTestOnBinding(const Point(10.0, 600.0-60.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(100.0, 600.0-100.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).skip(1).first);
     result = tester.hitTestOnBinding(const Point(100.0, 600.0-490.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(10.0, 600.0-520.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).last);
   });
@@ -129,11 +129,11 @@ void main() {
     result = tester.hitTestOnBinding(const Point(800.0-10.0, 10.0));
     expect(result.path.first.target, tester.firstRenderObject<RenderObject>(find.byType(Text)));
     result = tester.hitTestOnBinding(const Point(800.0-60.0, 10.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(800.0-100.0, 100.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).skip(1).first);
     result = tester.hitTestOnBinding(const Point(800.0-490.0, 100.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(800.0-520.0, 10.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).last);
   });
@@ -151,11 +151,11 @@ void main() {
     result = tester.hitTestOnBinding(const Point(10.0, 10.0));
     expect(result.path.first.target, tester.firstRenderObject<RenderObject>(find.byType(Text)));
     result = tester.hitTestOnBinding(const Point(60.0, 10.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(100.0, 100.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).skip(1).first);
     result = tester.hitTestOnBinding(const Point(490.0, 100.0));
-    expect(result.path.first.target, new isInstanceOf<RenderView>());
+    expect(result.path.first.target, const isInstanceOf<RenderView>());
     result = tester.hitTestOnBinding(const Point(520.0, 10.0));
     expect(result.path.first.target, tester.renderObjectList<RenderObject>(find.byType(Text)).last);
   });
@@ -164,7 +164,7 @@ void main() {
     await tester.pumpWidget(new Viewport2(
       offset: new ViewportOffset.fixed(0.0),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.all(100.0)),
+        new SliverPadding(padding: const EdgeInsets.all(100.0)),
         new SliverToBoxAdapter(child: new SizedBox(width: 400.0, height: 400.0, child: new Text('x'))),
       ],
     ));
@@ -177,7 +177,7 @@ void main() {
       axisDirection: AxisDirection.left,
       offset: new ViewportOffset.fixed(0.0),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.fromLTRB(90.0, 1.0, 110.0, 2.0)),
+        new SliverPadding(padding: const EdgeInsets.fromLTRB(90.0, 1.0, 110.0, 2.0)),
         new SliverToBoxAdapter(child: new SizedBox(width: 201.0, child: new Text('x'))),
       ],
     ));
@@ -187,7 +187,7 @@ void main() {
       axisDirection: AxisDirection.left,
       offset: new ViewportOffset.fixed(0.0),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.fromLTRB(110.0, 1.0, 80.0, 2.0)),
+        new SliverPadding(padding: const EdgeInsets.fromLTRB(110.0, 1.0, 80.0, 2.0)),
         new SliverToBoxAdapter(child: new SizedBox(width: 201.0, child: new Text('x'))),
       ],
     ));
@@ -200,7 +200,7 @@ void main() {
       axisDirection: AxisDirection.up,
       offset: new ViewportOffset.fixed(0.0),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
+        new SliverPadding(padding: const EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
       ],
     ));
     expect(tester.renderObject<RenderSliverPadding>(find.byType(SliverPadding)).endPadding, 1.0);
@@ -208,7 +208,7 @@ void main() {
       axisDirection: AxisDirection.down,
       offset: new ViewportOffset.fixed(0.0),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
+        new SliverPadding(padding: const EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
       ],
     ));
     expect(tester.renderObject<RenderSliverPadding>(find.byType(SliverPadding)).endPadding, 4.0);
@@ -216,7 +216,7 @@ void main() {
       axisDirection: AxisDirection.right,
       offset: new ViewportOffset.fixed(0.0),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
+        new SliverPadding(padding: const EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
       ],
     ));
     expect(tester.renderObject<RenderSliverPadding>(find.byType(SliverPadding)).endPadding, 8.0);
@@ -224,7 +224,7 @@ void main() {
       axisDirection: AxisDirection.left,
       offset: new ViewportOffset.fixed(0.0),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
+        new SliverPadding(padding: const EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
       ],
     ));
     expect(tester.renderObject<RenderSliverPadding>(find.byType(SliverPadding)).endPadding, 2.0);
@@ -232,7 +232,7 @@ void main() {
       axisDirection: AxisDirection.left,
       offset: new ViewportOffset.fixed(99999.9),
       slivers: <Widget>[
-        new SliverPadding(padding: new EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
+        new SliverPadding(padding: const EdgeInsets.fromLTRB(1.0, 2.0, 4.0, 8.0)),
       ],
     ));
     expect(tester.renderObject<RenderSliverPadding>(find.byType(SliverPadding)).endPadding, 2.0);

packages/flutter/test/widgets/slivers_protocol_test.dart

@@ -10,7 +10,7 @@ import 'package:flutter/widgets.dart';
 
 void verifyPaintPosition(GlobalKey key, Offset ideal) {
   RenderObject target = key.currentContext.findRenderObject();
-  expect(target.parent, new isInstanceOf<RenderViewport2>());
+  expect(target.parent, const isInstanceOf<RenderViewport2>());
   SliverPhysicalParentData parentData = target.parentData;
   Offset actual = parentData.paintOffset;
   expect(actual, ideal);
@@ -42,11 +42,11 @@ void main() {
     expect(position.pixels, max);
     expect(position.minScrollExtent, 0.0);
     expect(position.maxScrollExtent, max);
-    verifyPaintPosition(key1, new Offset(0.0, 0.0));
-    verifyPaintPosition(key2, new Offset(0.0, 0.0));
-    verifyPaintPosition(key3, new Offset(0.0, 0.0));
-    verifyPaintPosition(key4, new Offset(0.0, 0.0));
-    verifyPaintPosition(key5, new Offset(0.0, 50.0));
+    verifyPaintPosition(key1, const Offset(0.0, 0.0));
+    verifyPaintPosition(key2, const Offset(0.0, 0.0));
+    verifyPaintPosition(key3, const Offset(0.0, 0.0));
+    verifyPaintPosition(key4, const Offset(0.0, 0.0));
+    verifyPaintPosition(key5, const Offset(0.0, 50.0));
   });
 }
 

packages/flutter/test/widgets/slivers_test.dart

@@ -11,11 +11,11 @@ Future<Null> test(WidgetTester tester, double offset, { double anchor: 0.0 }) {
     anchor: anchor / 600.0,
     offset: new ViewportOffset.fixed(offset),
     slivers: <Widget>[
-      new SliverToBoxAdapter(child: new SizedBox(height: 400.0)),
-      new SliverToBoxAdapter(child: new SizedBox(height: 400.0)),
-      new SliverToBoxAdapter(child: new SizedBox(height: 400.0)),
-      new SliverToBoxAdapter(child: new SizedBox(height: 400.0)),
-      new SliverToBoxAdapter(child: new SizedBox(height: 400.0)),
+      new SliverToBoxAdapter(child: const SizedBox(height: 400.0)),
+      new SliverToBoxAdapter(child: const SizedBox(height: 400.0)),
+      new SliverToBoxAdapter(child: const SizedBox(height: 400.0)),
+      new SliverToBoxAdapter(child: const SizedBox(height: 400.0)),
+      new SliverToBoxAdapter(child: const SizedBox(height: 400.0)),
     ],
   ));
 }