prefer_const_constructor in packages/flutter/test (#7181)

packages/flutter/test/animation/animations_test.dart

@@ -17,7 +17,7 @@ void main() {
   test('toString control test', () {
     expect(kAlwaysCompleteAnimation.toString(), hasOneLineDescription);
     expect(kAlwaysDismissedAnimation.toString(), hasOneLineDescription);
-    expect(new AlwaysStoppedAnimation<double>(0.5).toString(), hasOneLineDescription);
+    expect(const AlwaysStoppedAnimation<double>(0.5).toString(), hasOneLineDescription);
     CurvedAnimation curvedAnimation = new CurvedAnimation(
       parent: kAlwaysDismissedAnimation,
       curve: Curves.ease

packages/flutter/test/animation/curves_test.dart

@@ -11,8 +11,8 @@ import 'package:flutter/widgets.dart';
 void main() {
   test('toString control test', () {
     expect(Curves.linear, hasOneLineDescription);
-    expect(new SawTooth(3), hasOneLineDescription);
-    expect(new Interval(0.25, 0.75), 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);
   });
 
@@ -26,7 +26,7 @@ void main() {
   });
 
   test('Threshold has a threshold', () {
-    Curve step = new Threshold(0.25);
+    Curve step = const Threshold(0.25);
     expect(step.transform(0.0), 0.0);
     expect(step.transform(0.24), 0.0);
     expect(step.transform(0.25), 1.0);

packages/flutter/test/animation/tween_test.dart

@@ -33,8 +33,8 @@ void main() {
   });
 
   test('SizeTween', () {
-    SizeTween tween = new SizeTween(begin: Size.zero, end: new Size(20.0, 30.0));
-    expect(tween.lerp(0.5), equals(new Size(10.0, 15.0)));
+    SizeTween tween = new SizeTween(begin: Size.zero, end: const Size(20.0, 30.0));
+    expect(tween.lerp(0.5), equals(const Size(10.0, 15.0)));
     expect(tween, hasOneLineDescription);
   });
 

packages/flutter/test/cassowary/cassowary_test.dart

@@ -386,12 +386,12 @@ void main() {
     Expression e = new Expression(<Term>[t], 0.0);
 
     expect((c * c).value, 100);
-    expect(() => v * v, throwsA(new isInstanceOf<ParserException>()));
-    expect(() => v / v, throwsA(new isInstanceOf<ParserException>()));
-    expect(() => v * t, throwsA(new isInstanceOf<ParserException>()));
-    expect(() => v / t, throwsA(new isInstanceOf<ParserException>()));
-    expect(() => v * e, throwsA(new isInstanceOf<ParserException>()));
-    expect(() => v / e, throwsA(new isInstanceOf<ParserException>()));
+    expect(() => v * v, throwsA(const isInstanceOf<ParserException>()));
+    expect(() => v / v, throwsA(const isInstanceOf<ParserException>()));
+    expect(() => v * t, throwsA(const isInstanceOf<ParserException>()));
+    expect(() => v / t, throwsA(const isInstanceOf<ParserException>()));
+    expect(() => v * e, throwsA(const isInstanceOf<ParserException>()));
+    expect(() => v / e, throwsA(const isInstanceOf<ParserException>()));
     expect(() => v * c, returnsNormally);
     expect(() => v / c, returnsNormally);
   });

packages/flutter/test/engine/color_test.dart

@@ -8,7 +8,7 @@ import 'package:test/test.dart';
 
 void main() {
   test("color accessors should work", () {
-    Color foo = new Color(0x12345678);
+    Color foo = const Color(0x12345678);
     expect(foo.alpha, equals(0x12));
     expect(foo.red, equals(0x34));
     expect(foo.green, equals(0x56));
@@ -16,7 +16,7 @@ void main() {
   });
 
   test("paint set to black", () {
-    Color c = new Color(0x00000000);
+    Color c = const Color(0x00000000);
     Paint p = new Paint();
     p.color = c;
     expect(c.toString(), equals('Color(0x00000000)'));
@@ -24,7 +24,7 @@ void main() {
 
   test("color created with out of bounds value", () {
     try {
-      Color c = new Color(0x100 << 24);
+      Color c = const Color(0x100 << 24);
       Paint p = new Paint();
       p.color = c;
     } catch (e) {
@@ -34,7 +34,7 @@ void main() {
 
   test("color created with wildly out of bounds value", () {
     try {
-      Color c = new Color(1 << 1000000);
+      Color c = const Color(1 << 1000000);
       Paint p = new Paint();
       p.color = c;
     } catch (e) {

packages/flutter/test/foundation/licenses_test.dart

@@ -9,7 +9,7 @@ void main() {
   test('LicenseEntryWithLineBreaks - most cases', () {
     // There's some trailing spaces in this string.
     // To avoid IDEs stripping them, I've escaped them as \u0020.
-    List<LicenseParagraph> paragraphs = new LicenseEntryWithLineBreaks(null, '''
+    List<LicenseParagraph> paragraphs = const LicenseEntryWithLineBreaks(null, '''
 A
 A
 A
@@ -157,16 +157,16 @@ S
   });
 
   test('LicenseEntryWithLineBreaks - leading and trailing whitespace', () {
-    expect(new LicenseEntryWithLineBreaks(null, '    \n\n    ').paragraphs.toList(), isEmpty);
+    expect(const LicenseEntryWithLineBreaks(null, '    \n\n    ').paragraphs.toList(), isEmpty);
 
     List<LicenseParagraph> paragraphs;
 
-    paragraphs = new LicenseEntryWithLineBreaks(null, '    \nA\n    ').paragraphs.toList();
+    paragraphs = const LicenseEntryWithLineBreaks(null, '    \nA\n    ').paragraphs.toList();
     expect(paragraphs[0].text, 'A');
     expect(paragraphs[0].indent, 0);
     expect(paragraphs, hasLength(1));
 
-    paragraphs = new LicenseEntryWithLineBreaks(null, '\n\n\nA\n\n\n').paragraphs.toList();
+    paragraphs = const LicenseEntryWithLineBreaks(null, '\n\n\nA\n\n\n').paragraphs.toList();
     expect(paragraphs[0].text, 'A');
     expect(paragraphs[0].indent, 0);
     expect(paragraphs, hasLength(1));
@@ -175,12 +175,12 @@ S
   test('LicenseRegistry', () async {
     expect(await LicenseRegistry.licenses.toList(), isEmpty);
     LicenseRegistry.addLicense(() async* {
-      yield new LicenseEntryWithLineBreaks(null, 'A');
-      yield new LicenseEntryWithLineBreaks(null, 'B');
+      yield const LicenseEntryWithLineBreaks(null, 'A');
+      yield const LicenseEntryWithLineBreaks(null, 'B');
     });
     LicenseRegistry.addLicense(() async* {
-      yield new LicenseEntryWithLineBreaks(null, 'C');
-      yield new LicenseEntryWithLineBreaks(null, 'D');
+      yield const LicenseEntryWithLineBreaks(null, 'C');
+      yield const LicenseEntryWithLineBreaks(null, 'D');
     });
     expect(await LicenseRegistry.licenses.toList(), hasLength(4));
     List<LicenseEntry> licenses = await LicenseRegistry.licenses.toList();

packages/flutter/test/gestures/double_tap_test.dart

@@ -206,7 +206,7 @@ void main() {
     GestureBinding.instance.gestureArena.sweep(1);
     expect(doubleTapRecognized, isFalse);
 
-    tester.async.elapse(new Duration(milliseconds: 5000));
+    tester.async.elapse(const Duration(milliseconds: 5000));
     tap.addPointer(down2);
     tester.closeArena(2);
     expect(doubleTapRecognized, isFalse);
@@ -240,7 +240,7 @@ void main() {
     GestureBinding.instance.gestureArena.sweep(1);
     expect(doubleTapRecognized, isFalse);
 
-    tester.async.elapse(new Duration(milliseconds: 5000));
+    tester.async.elapse(const Duration(milliseconds: 5000));
     tap.addPointer(down2);
     tester.closeArena(2);
     expect(doubleTapRecognized, isFalse);
@@ -252,7 +252,7 @@ void main() {
     GestureBinding.instance.gestureArena.sweep(2);
     expect(doubleTapRecognized, isFalse);
 
-    tester.async.elapse(new Duration(milliseconds: 100));
+    tester.async.elapse(const Duration(milliseconds: 100));
     tap.addPointer(down5);
     tester.closeArena(5);
     expect(doubleTapRecognized, isFalse);
@@ -281,7 +281,7 @@ void main() {
     tester.route(down1);
     expect(doubleTapRecognized, isFalse);
 
-    tester.async.elapse(new Duration(milliseconds: 1000));
+    tester.async.elapse(const Duration(milliseconds: 1000));
     tester.route(up1);
     expect(doubleTapRecognized, isFalse);
     GestureBinding.instance.gestureArena.sweep(1);

packages/flutter/test/gestures/events_test.dart

@@ -11,8 +11,8 @@ void main() {
   setUp(ensureGestureBinding);
 
   testGesture('toString control tests', (GestureTester tester) {
-    expect(new PointerDownEvent(), hasOneLineDescription);
-    expect(new PointerDownEvent().toStringFull(), hasOneLineDescription);
+    expect(const PointerDownEvent(), hasOneLineDescription);
+    expect(const PointerDownEvent().toStringFull(), hasOneLineDescription);
   });
 
   testGesture('nthMouseButton control tests', (GestureTester tester) {

packages/flutter/test/gestures/gesture_binding_test.dart

@@ -33,10 +33,10 @@ void main() {
   setUp(ensureTestGestureBinding);
 
   test('Pointer tap events', () {
-    ui.PointerDataPacket packet = new ui.PointerDataPacket(
-      data: <ui.PointerData>[
-        new ui.PointerData(change: ui.PointerChange.down),
-        new ui.PointerData(change: ui.PointerChange.up),
+    ui.PointerDataPacket packet = const ui.PointerDataPacket(
+      data: const <ui.PointerData>[
+        const ui.PointerData(change: ui.PointerChange.down),
+        const ui.PointerData(change: ui.PointerChange.up),
       ]
     );
 
@@ -50,11 +50,11 @@ void main() {
   });
 
   test('Pointer move events', () {
-    ui.PointerDataPacket packet = new ui.PointerDataPacket(
-      data: <ui.PointerData>[
-        new ui.PointerData(change: ui.PointerChange.down),
-        new ui.PointerData(change: ui.PointerChange.move),
-        new ui.PointerData(change: ui.PointerChange.up),
+    ui.PointerDataPacket packet = const ui.PointerDataPacket(
+      data: const <ui.PointerData>[
+        const ui.PointerData(change: ui.PointerChange.down),
+        const ui.PointerData(change: ui.PointerChange.move),
+        const ui.PointerData(change: ui.PointerChange.up),
       ]
     );
 
@@ -69,14 +69,14 @@ void main() {
   });
 
   test('Synthetic move events', () {
-    ui.PointerDataPacket packet = new ui.PointerDataPacket(
-      data: <ui.PointerData>[
-        new ui.PointerData(
+    ui.PointerDataPacket packet = const ui.PointerDataPacket(
+      data: const <ui.PointerData>[
+        const ui.PointerData(
           change: ui.PointerChange.down,
           physicalX: 1.0,
           physicalY: 3.0,
         ),
-        new ui.PointerData(
+        const ui.PointerData(
           change: ui.PointerChange.up,
           physicalX: 10.0,
           physicalY: 15.0,
@@ -96,10 +96,10 @@ void main() {
   });
 
   test('Pointer cancel events', () {
-    ui.PointerDataPacket packet = new ui.PointerDataPacket(
-      data: <ui.PointerData>[
-        new ui.PointerData(change: ui.PointerChange.down),
-        new ui.PointerData(change: ui.PointerChange.cancel),
+    ui.PointerDataPacket packet = const ui.PointerDataPacket(
+      data: const <ui.PointerData>[
+        const ui.PointerData(change: ui.PointerChange.down),
+        const ui.PointerData(change: ui.PointerChange.cancel),
       ]
     );
 
@@ -113,10 +113,10 @@ void main() {
   });
 
   test('Can cancel pointers', () {
-    ui.PointerDataPacket packet = new ui.PointerDataPacket(
-      data: <ui.PointerData>[
-        new ui.PointerData(change: ui.PointerChange.down),
-        new ui.PointerData(change: ui.PointerChange.up),
+    ui.PointerDataPacket packet = const ui.PointerDataPacket(
+      data: const <ui.PointerData>[
+        const ui.PointerData(change: ui.PointerChange.down),
+        const ui.PointerData(change: ui.PointerChange.up),
       ]
     );
 

packages/flutter/test/gestures/tap_test.dart

@@ -193,7 +193,7 @@ void main() {
     tester.route(down1);
     expect(tapRecognized, isFalse);
 
-    tester.async.elapse(new Duration(milliseconds: 500));
+    tester.async.elapse(const Duration(milliseconds: 500));
     expect(tapRecognized, isFalse);
     tester.route(up1);
     expect(tapRecognized, isTrue);

packages/flutter/test/gestures/velocity_tracker_test.dart

@@ -49,13 +49,13 @@ void main() {
   });
 
   test('Velocity control test', () {
-    Velocity velocity1 = new Velocity(pixelsPerSecond: const Offset(7.0, 0.0));
-    Velocity velocity2 = new Velocity(pixelsPerSecond: const Offset(12.0, 0.0));
-    expect(velocity1, equals(new Velocity(pixelsPerSecond: new Offset(7.0, 0.0))));
+    Velocity velocity1 = const Velocity(pixelsPerSecond: const Offset(7.0, 0.0));
+    Velocity velocity2 = const Velocity(pixelsPerSecond: const Offset(12.0, 0.0));
+    expect(velocity1, equals(const Velocity(pixelsPerSecond: const Offset(7.0, 0.0))));
     expect(velocity1, isNot(equals(velocity2)));
-    expect(velocity2 - velocity1, equals(new Velocity(pixelsPerSecond: new Offset(5.0, 0.0))));
-    expect((-velocity1).pixelsPerSecond, new Offset(-7.0, 0.0));
-    expect(velocity1 + velocity2, equals(new Velocity(pixelsPerSecond: new Offset(19.0, 0.0))));
+    expect(velocity2 - velocity1, equals(const Velocity(pixelsPerSecond: const Offset(5.0, 0.0))));
+    expect((-velocity1).pixelsPerSecond, const Offset(-7.0, 0.0));
+    expect(velocity1 + velocity2, equals(const Velocity(pixelsPerSecond: const Offset(19.0, 0.0))));
     expect(velocity1.hashCode, isNot(equals(velocity2.hashCode)));
     expect(velocity1, hasOneLineDescription);
   });

packages/flutter/test/material/app_bar_test.dart

@@ -111,8 +111,8 @@ void main() {
     expect(tester.getSize(title).width, equals(800.0 - 72.0 - 8.0));
 
     actions = <Widget>[
-      new SizedBox(width: 100.0),
-      new SizedBox(width: 100.0)
+      const SizedBox(width: 100.0),
+      const SizedBox(width: 100.0)
     ];
     await tester.pumpWidget(buildApp());
 
@@ -171,8 +171,8 @@ void main() {
     leading = null;
     titleWidth = 620.0;
     actions = <Widget>[
-      new SizedBox(width: 45.0),
-      new SizedBox(width: 45.0)
+      const SizedBox(width: 45.0),
+      const SizedBox(width: 45.0)
     ];
     await tester.pumpWidget(buildApp());
     expect(tester.getTopLeft(title).x, 800 - 620 - 45 - 45 - 8);

packages/flutter/test/material/arc_test.dart

@@ -9,16 +9,16 @@ void main() {
   test('on-axis MaterialPointArcTween', () {
     MaterialPointArcTween tween = new MaterialPointArcTween(
       begin: Point.origin,
-      end: new Point(0.0, 10.0)
+      end: const Point(0.0, 10.0)
     );
-    expect(tween.lerp(0.5), equals(new Point(0.0, 5.0)));
+    expect(tween.lerp(0.5), equals(const Point(0.0, 5.0)));
     expect(tween, hasOneLineDescription);
 
     tween = new MaterialPointArcTween(
       begin: Point.origin,
-      end: new Point(10.0, 0.0)
+      end: const Point(10.0, 0.0)
     );
-    expect(tween.lerp(0.5), equals(new Point(5.0, 0.0)));
+    expect(tween.lerp(0.5), equals(const Point(5.0, 0.0)));
   });
 
   test('on-axis MaterialRectArcTween', () {

packages/flutter/test/material/drop_down_test.dart

@@ -224,7 +224,7 @@ void main() {
     // The selected dropdown item is both in menu we just popped up, and in
     // the IndexedStack contained by the dropdown button. Both of them should
     // have the same origin and height as the dropdown button.
-    List<RenderObject> itemBoxes = tester.renderObjectList(find.byKey(new ValueKey<String>('two'))).toList();
+    List<RenderObject> itemBoxes = tester.renderObjectList(find.byKey(const ValueKey<String>('two'))).toList();
     expect(itemBoxes.length, equals(2));
     for(RenderBox itemBox in itemBoxes) {
       assert(itemBox.attached);
@@ -254,7 +254,7 @@ void main() {
     // The selected dropdown item is both in menu we just popped up, and in
     // the IndexedStack contained by the dropdown button. Both of them should
     // have the same vertical center as the button.
-    List<RenderBox> itemBoxes = tester.renderObjectList(find.byKey(new ValueKey<String>('two'))).toList();
+    List<RenderBox> itemBoxes = tester.renderObjectList(find.byKey(const ValueKey<String>('two'))).toList();
     expect(itemBoxes.length, equals(2));
 
     // When isDense is true, the button's height is reduced. The menu items'

packages/flutter/test/material/expansion_panel_test.dart

@@ -22,7 +22,7 @@ void main() {
               headerBuilder: (BuildContext context, bool isExpanded) {
                 return new Text(isExpanded ? 'B' : 'A');
               },
-              body: new SizedBox(height: 100.0)
+              body: const SizedBox(height: 100.0)
             )
           ]
         )
@@ -53,7 +53,7 @@ void main() {
               headerBuilder: (BuildContext context, bool isExpanded) {
                 return new Text(isExpanded ? 'B' : 'A');
               },
-              body: new SizedBox(height: 100.0),
+              body: const SizedBox(height: 100.0),
               isExpanded: true // this is the addition
             )
           ]

packages/flutter/test/material/icon_test.dart

@@ -11,7 +11,7 @@ void main() {
   testWidgets('Icon sizing - no theme, default size', (WidgetTester tester) async {
     await tester.pumpWidget(
       new Center(
-        child: new Icon(null)
+        child: const Icon(null)
       )
     );
 
@@ -22,7 +22,7 @@ void main() {
   testWidgets('Icon sizing - no theme, explicit size', (WidgetTester tester) async {
     await tester.pumpWidget(
       new Center(
-        child: new Icon(
+        child: const Icon(
           null,
           size: 96.0
         )
@@ -37,8 +37,8 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new IconTheme(
-          data: new IconThemeData(size: 36.0),
-          child: new Icon(null)
+          data: const IconThemeData(size: 36.0),
+          child: const Icon(null)
         )
       )
     );
@@ -51,8 +51,8 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new IconTheme(
-          data: new IconThemeData(size: 36.0),
-          child: new Icon(
+          data: const IconThemeData(size: 36.0),
+          child: const Icon(
             null,
             size: 48.0
           )
@@ -68,8 +68,8 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new IconTheme(
-          data: new IconThemeData(),
-          child: new Icon(null)
+          data: const IconThemeData(),
+          child: const Icon(null)
         )
       )
     );

packages/flutter/test/material/image_icon_test.dart

@@ -11,7 +11,7 @@ void main() {
   testWidgets('ImageIcon sizing - no theme, default size', (WidgetTester tester) async {
     await tester.pumpWidget(
       new Center(
-        child: new ImageIcon(null)
+        child: const ImageIcon(null)
       )
     );
 
@@ -22,7 +22,7 @@ void main() {
   testWidgets('ImageIcon sizing - no theme, explicit size', (WidgetTester tester) async {
     await tester.pumpWidget(
       new Center(
-        child: new ImageIcon(
+        child: const ImageIcon(
           null,
           size: 96.0
         )
@@ -37,8 +37,8 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new IconTheme(
-          data: new IconThemeData(size: 36.0),
-          child: new ImageIcon(null)
+          data: const IconThemeData(size: 36.0),
+          child: const ImageIcon(null)
         )
       )
     );
@@ -51,8 +51,8 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new IconTheme(
-          data: new IconThemeData(size: 36.0),
-          child: new ImageIcon(
+          data: const IconThemeData(size: 36.0),
+          child: const ImageIcon(
             null,
             size: 48.0
           )
@@ -68,8 +68,8 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new IconTheme(
-          data: new IconThemeData(),
-          child: new ImageIcon(null)
+          data: const IconThemeData(),
+          child: const ImageIcon(null)
         )
       )
     );

packages/flutter/test/material/scaffold_test.dart

@@ -15,10 +15,10 @@ void main() {
     ));
 
     RenderBox bodyBox = tester.renderObject(find.byKey(bodyKey));
-    expect(bodyBox.size, equals(new Size(800.0, 544.0)));
+    expect(bodyBox.size, equals(const Size(800.0, 544.0)));
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(padding: new EdgeInsets.only(bottom: 100.0)),
+      data: const MediaQueryData(padding: const EdgeInsets.only(bottom: 100.0)),
       child: new Scaffold(
         appBar: new AppBar(title: new Text('Title')),
         body: new Container(key: bodyKey)
@@ -26,10 +26,10 @@ void main() {
     ));
 
     bodyBox = tester.renderObject(find.byKey(bodyKey));
-    expect(bodyBox.size, equals(new Size(800.0, 444.0)));
+    expect(bodyBox.size, equals(const Size(800.0, 444.0)));
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(padding: new EdgeInsets.only(bottom: 100.0)),
+      data: const MediaQueryData(padding: const EdgeInsets.only(bottom: 100.0)),
       child: new Scaffold(
         appBar: new AppBar(title: new Text('Title')),
         body: new Container(key: bodyKey),
@@ -38,7 +38,7 @@ void main() {
     ));
 
     bodyBox = tester.renderObject(find.byKey(bodyKey));
-    expect(bodyBox.size, equals(new Size(800.0, 544.0)));
+    expect(bodyBox.size, equals(const Size(800.0, 544.0)));
   });
 
   testWidgets('Floating action animation', (WidgetTester tester) async {
@@ -137,7 +137,7 @@ void main() {
       new MaterialApp(
         theme: new ThemeData(platform: TargetPlatform.iOS),
         home: new MediaQuery(
-          data: new MediaQueryData(padding: const EdgeInsets.only(top: 25.0)), // status bar
+          data: const MediaQueryData(padding: const EdgeInsets.only(top: 25.0)), // status bar
           child: new Scaffold(
             scrollableKey: scrollableKey,
             appBar: new AppBar(
@@ -159,7 +159,7 @@ void main() {
     expect(scrollableKey.currentState.scrollOffset, equals(500.0));
     await tester.tapAt(const Point(100.0, 10.0));
     await tester.pump();
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(scrollableKey.currentState.scrollOffset, equals(0.0));
   });
 
@@ -171,7 +171,7 @@ void main() {
       new MaterialApp(
         theme: new ThemeData(platform: TargetPlatform.android),
         home: new MediaQuery(
-          data: new MediaQueryData(padding: const EdgeInsets.only(top: 25.0)), // status bar
+          data: const MediaQueryData(padding: const EdgeInsets.only(top: 25.0)), // status bar
           child: new Scaffold(
             scrollableKey: scrollableKey,
             appBar: new AppBar(
@@ -193,7 +193,7 @@ void main() {
     expect(scrollableKey.currentState.scrollOffset, equals(500.0));
     await tester.tapAt(const Point(100.0, 10.0));
     await tester.pump();
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(scrollableKey.currentState.scrollOffset, equals(500.0));
   });
 

packages/flutter/test/material/stepper_test.dart

@@ -18,14 +18,14 @@ void main() {
           steps: <Step>[
             new Step(
               title: new Text('Step 1'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 100.0
               )
             ),
             new Step(
               title: new Text('Step 2'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 100.0
               )
@@ -47,14 +47,14 @@ void main() {
             steps: <Step>[
               new Step(
                 title: new Text('Step 1'),
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 100.0,
                   height: 100.0
                 )
               ),
               new Step(
                 title: new Text('Step 2'),
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 200.0,
                   height: 200.0
                 )
@@ -76,14 +76,14 @@ void main() {
             steps: <Step>[
               new Step(
                 title: new Text('Step 1'),
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 100.0,
                   height: 100.0
                 )
               ),
               new Step(
                 title: new Text('Step 2'),
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 200.0,
                   height: 200.0
                 )
@@ -111,7 +111,7 @@ void main() {
             steps: <Step>[
               new Step(
                 title: new Text('Step 1'),
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 100.0,
                   height: 100.0
                 )
@@ -188,14 +188,14 @@ void main() {
           steps: <Step>[
             new Step(
               title: new Text('Step 1'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 100.0
               )
             ),
             new Step(
               title: new Text('Step 2'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 200.0,
                 height: 200.0
               )
@@ -224,7 +224,7 @@ void main() {
           steps: <Step>[
             new Step(
               title: new Text('Step 1'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 100.0
               )
@@ -232,7 +232,7 @@ void main() {
             new Step(
               title: new Text('Step 2'),
               state: StepState.disabled,
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 100.0
               )
@@ -253,21 +253,21 @@ void main() {
           steps: <Step>[
             new Step(
               title: new Text('Step 1'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 300.0
               )
             ),
             new Step(
               title: new Text('Step 2'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 300.0
               )
             ),
             new Step(
               title: new Text('Step 3'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 100.0
               )
@@ -288,21 +288,21 @@ void main() {
           steps: <Step>[
             new Step(
               title: new Text('Step 1'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 300.0
               )
             ),
             new Step(
               title: new Text('Step 2'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 300.0
               )
             ),
             new Step(
               title: new Text('Step 3'),
-              content: new SizedBox(
+              content: const SizedBox(
                 width: 100.0,
                 height: 100.0
               )
@@ -312,7 +312,7 @@ void main() {
       )
     );
 
-    await tester.pump(new Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
     expect(scrollableState.scrollOffset, greaterThan(0.0));
   });
 
@@ -325,14 +325,14 @@ void main() {
               new Step(
                 title: new Text('A'),
                 state: StepState.complete,
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 100.0,
                   height: 100.0
                 )
               ),
               new Step(
                 title: new Text('B'),
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 100.0,
                   height: 100.0
                 )
@@ -356,7 +356,7 @@ void main() {
               new Step(
                 title: new Text('A'),
                 state: StepState.error,
-                content: new SizedBox(
+                content: const SizedBox(
                   width: 100.0,
                   height: 100.0
                 )

packages/flutter/test/material/tabs_test.dart

@@ -211,7 +211,7 @@ void main() {
 
     await tester.pumpWidget(builder());
     TestGesture gesture = await tester.startGesture(tester.getCenter(find.text(tabs[0])));
-    await gesture.moveBy(new Offset(-600.0, 0.0));
+    await gesture.moveBy(const Offset(-600.0, 0.0));
     await tester.pump();
     expect(value, equals(tabs[0]));
     findStateMarkerState(tabs[1]).marker = 'marked';
@@ -225,7 +225,7 @@ void main() {
     // Move to the third tab.
 
     gesture = await tester.startGesture(tester.getCenter(find.text(tabs[1])));
-    await gesture.moveBy(new Offset(-600.0, 0.0));
+    await gesture.moveBy(const Offset(-600.0, 0.0));
     await gesture.up();
     await tester.pump();
     expect(findStateMarkerState(tabs[1]).marker, equals('marked'));
@@ -240,7 +240,7 @@ void main() {
     // Move back to the second tab.
 
     gesture = await tester.startGesture(tester.getCenter(find.text(tabs[2])));
-    await gesture.moveBy(new Offset(600.0, 0.0));
+    await gesture.moveBy(const Offset(600.0, 0.0));
     await tester.pump();
     StateMarkerState markerState = findStateMarkerState(tabs[1]);
     expect(markerState.marker, isNull);
@@ -267,7 +267,7 @@ void main() {
 
     // Fling to the left, switch from the 'LEFT' tab to the 'RIGHT'
     Point flingStart = tester.getCenter(find.text('LEFT CHILD'));
-    await tester.flingFrom(flingStart, new Offset(-200.0, 0.0), 10000.0);
+    await tester.flingFrom(flingStart, const Offset(-200.0, 0.0), 10000.0);
     await tester.pump();
     await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
     expect(selection.value, equals('RIGHT'));
@@ -276,7 +276,7 @@ void main() {
 
     // Fling to the right, switch back to the 'LEFT' tab
     flingStart = tester.getCenter(find.text('RIGHT CHILD'));
-    await tester.flingFrom(flingStart, new Offset(200.0, 0.0), 10000.0);
+    await tester.flingFrom(flingStart, const Offset(200.0, 0.0), 10000.0);
     await tester.pump();
     await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
     expect(selection.value, equals('LEFT'));
@@ -301,7 +301,7 @@ void main() {
     // a change to the selected tab, everything should just settle back to
     // to where it started.
     Point flingStart = tester.getCenter(find.text('LEFT CHILD'));
-    await tester.flingFrom(flingStart, new Offset(-200.0, 0.0), -10000.0);
+    await tester.flingFrom(flingStart, const Offset(-200.0, 0.0), -10000.0);
     await tester.pump();
     await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
     expect(selection.value, equals('LEFT'));
@@ -342,7 +342,7 @@ void main() {
     );
 
     // After a small slow fling to the left, we expect the second item to still be visible.
-    await tester.fling(find.text('AAAAAA'), new Offset(-25.0, 0.0), 100.0);
+    await tester.fling(find.text('AAAAAA'), const Offset(-25.0, 0.0), 100.0);
     await tester.pump();
     await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
     final RenderBox box = tester.renderObject(find.text('BBBBBB'));

packages/flutter/test/material/theme_test.dart

@@ -200,7 +200,7 @@ void main() {
                     showDialog(
                       context: context,
                       child: new Scaffold(
-                        body: new SizedBox(
+                        body: const SizedBox(
                           width: 200.0,
                           height: 200.0,
                         ),

packages/flutter/test/painting/box_painter_test.dart

@@ -7,7 +7,7 @@ import 'package:flutter/painting.dart';
 
 void main() {
   test("BorderSide control test", () {
-    BorderSide side1 = new BorderSide();
+    BorderSide side1 = const BorderSide();
     BorderSide side2 = side1.copyWith(
       color: const Color(0xFF00FFFF),
       width: 2.0,
@@ -55,13 +55,13 @@ void main() {
   });
 
   test("BoxShadow control test", () {
-    BoxShadow shadow1 = new BoxShadow(blurRadius: 4.0);
+    BoxShadow shadow1 = const BoxShadow(blurRadius: 4.0);
     BoxShadow shadow2 = BoxShadow.lerp(null, shadow1, 0.25);
     BoxShadow shadow3 = BoxShadow.lerp(shadow1, null, 0.25);
 
     expect(shadow1, hasOneLineDescription);
     expect(shadow1.hashCode, isNot(equals(shadow2.hashCode)));
-    expect(shadow1, equals(new BoxShadow(blurRadius: 4.0)));
+    expect(shadow1, equals(const BoxShadow(blurRadius: 4.0)));
 
     expect(shadow2.blurRadius, equals(1.0));
     expect(shadow3.blurRadius, equals(3.0));

packages/flutter/test/painting/decoration_test.dart

@@ -47,8 +47,8 @@ class AsyncTestImageProvider extends ImageProvider<int> {
 
 void main() {
   test("Decoration.lerp()", () {
-    BoxDecoration a = new BoxDecoration(backgroundColor: const Color(0xFFFFFFFF));
-    BoxDecoration b = new BoxDecoration(backgroundColor: const Color(0x00000000));
+    BoxDecoration a = const BoxDecoration(backgroundColor: const Color(0xFFFFFFFF));
+    BoxDecoration b = const BoxDecoration(backgroundColor: const Color(0x00000000));
 
     BoxDecoration c = Decoration.lerp(a, b, 0.0);
     expect(c.backgroundColor, equals(a.backgroundColor));
@@ -71,7 +71,7 @@ void main() {
     });
 
     TestCanvas canvas = new TestCanvas();
-    ImageConfiguration imageConfiguration = new ImageConfiguration(size: Size.zero);
+    ImageConfiguration imageConfiguration = const ImageConfiguration(size: Size.zero);
     boxPainter.paint(canvas, Offset.zero, imageConfiguration);
 
     // The onChanged callback should not be invoked during the call to boxPainter.paint
@@ -90,7 +90,7 @@ void main() {
       });
 
       TestCanvas canvas = new TestCanvas();
-      ImageConfiguration imageConfiguration = new ImageConfiguration(size: Size.zero);
+      ImageConfiguration imageConfiguration = const ImageConfiguration(size: Size.zero);
       boxPainter.paint(canvas, Offset.zero, imageConfiguration);
 
       // The onChanged callback should be invoked asynchronously.

packages/flutter/test/painting/edge_insets_test.dart

@@ -8,8 +8,8 @@ import 'package:test/test.dart';
 
 void main() {
   test("EdgeInsets.lerp()", () {
-    EdgeInsets a = new EdgeInsets.all(10.0);
-    EdgeInsets b = new EdgeInsets.all(20.0);
+    EdgeInsets a = const EdgeInsets.all(10.0);
+    EdgeInsets b = const EdgeInsets.all(20.0);
     expect(EdgeInsets.lerp(a, b, 0.25), equals(a * 1.25));
     expect(EdgeInsets.lerp(a, b, 0.25), equals(b * 0.625));
     expect(EdgeInsets.lerp(a, b, 0.25), equals(a + const EdgeInsets.all(2.5)));

packages/flutter/test/painting/paint_image_test.dart

@@ -39,7 +39,7 @@ void main() {
       rect: new Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
       image: image,
       fit: ImageFit.cover,
-      alignment: new FractionalOffset(0.0, 0.5)
+      alignment: const FractionalOffset(0.0, 0.5)
     );
 
     Invocation command = canvas.invocations.firstWhere((Invocation invocation) {

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');
-    TextSpan a2 = new TextSpan(text: 'a');
+    TextSpan a1 = new TextSpan(text: 'a'); // ignore: prefer_const_constructor
+    TextSpan a2 = new TextSpan(text: 'a'); // ignore: prefer_const_constructor
     TextSpan b1 = new TextSpan(children: <TextSpan>[ a1 ]);
     TextSpan b2 = new TextSpan(children: <TextSpan>[ a2 ]);
-    TextSpan c1 = new TextSpan();
-    TextSpan c2 = new TextSpan();
+    TextSpan c1 = new TextSpan(); // ignore: prefer_const_constructor
+    TextSpan c2 = new TextSpan(); // ignore: prefer_const_constructor
 
     expect(a1 == a2, isTrue);
     expect(b1 == b2, isTrue);
@@ -29,20 +29,20 @@ void main() {
   });
 
   test('TextSpan', () {
-    final TextSpan test = new TextSpan(
+    final TextSpan test = const TextSpan(
       text: 'a',
-      style: new TextStyle(
+      style: const TextStyle(
         fontSize: 10.0
       ),
-      children: <TextSpan>[
-        new TextSpan(
+      children: const <TextSpan>[
+        const TextSpan(
           text: 'b',
-          children: <TextSpan>[
-            new TextSpan()
+          children: const <TextSpan>[
+            const TextSpan()
           ]
         ),
         null,
-        new TextSpan(
+        const TextSpan(
           text: 'c'
         ),
       ]

packages/flutter/test/physics/newton_test.dart

@@ -119,7 +119,7 @@ void main() {
 
     // Just so we don't forget how to create a desc without the ratio.
     SpringSimulation other = new SpringSimulation(
-        new SpringDescription(mass: 1.0, springConstant: 100.0, damping: 20.0),
+        const SpringDescription(mass: 1.0, springConstant: 100.0, damping: 20.0),
         0.0, 20.0, 20.0);
     expect(other.type, SpringType.criticallyDamped);
   });
@@ -261,7 +261,7 @@ void main() {
       spring: spring,
       drag: 0.025,
     );
-    scroll.tolerance = new Tolerance(velocity: 45.0, distance: 1.5);
+    scroll.tolerance = const Tolerance(velocity: 45.0, distance: 1.5);
 
     expect(scroll.isDone(0.0), false);
     expect(scroll.x(0.0), closeTo(500.0, .0001));

packages/flutter/test/rendering/baseline_test.dart

@@ -17,7 +17,7 @@ void main() {
       child: parent = new RenderBaseline(
         baseline: 0.0,
         baselineType: TextBaseline.alphabetic,
-        child: child = new RenderSizedBox(new Size(100.0, 100.0))
+        child: child = new RenderSizedBox(const Size(100.0, 100.0))
       )
     );
     BoxParentData childParentData = child.parentData;
@@ -25,30 +25,30 @@ void main() {
     layout(root, phase: EnginePhase.layout);
     expect(childParentData.offset.dx, equals(0.0));
     expect(childParentData.offset.dy, equals(-100.0));
-    expect(parent.size, equals(new Size(100.0, 0.0)));
+    expect(parent.size, equals(const Size(100.0, 0.0)));
 
     parent.baseline = 25.0;
     pumpFrame(phase: EnginePhase.layout);
     expect(childParentData.offset.dx, equals(0.0));
     expect(childParentData.offset.dy, equals(-75.0));
-    expect(parent.size, equals(new Size(100.0, 25.0)));
+    expect(parent.size, equals(const Size(100.0, 25.0)));
 
     parent.baseline = 90.0;
     pumpFrame(phase: EnginePhase.layout);
     expect(childParentData.offset.dx, equals(0.0));
     expect(childParentData.offset.dy, equals(-10.0));
-    expect(parent.size, equals(new Size(100.0, 90.0)));
+    expect(parent.size, equals(const Size(100.0, 90.0)));
 
     parent.baseline = 100.0;
     pumpFrame(phase: EnginePhase.layout);
     expect(childParentData.offset.dx, equals(0.0));
     expect(childParentData.offset.dy, equals(0.0));
-    expect(parent.size, equals(new Size(100.0, 100.0)));
+    expect(parent.size, equals(const Size(100.0, 100.0)));
 
     parent.baseline = 110.0;
     pumpFrame(phase: EnginePhase.layout);
     expect(childParentData.offset.dx, equals(0.0));
     expect(childParentData.offset.dy, equals(10.0));
-    expect(parent.size, equals(new Size(100.0, 110.0)));
+    expect(parent.size, equals(const Size(100.0, 110.0)));
   });
 }

packages/flutter/test/rendering/box_constraints_test.dart

@@ -8,12 +8,12 @@ import 'package:test/test.dart';
 void main() {
   test('BoxConstraints toString', () {
     expect(const BoxConstraints.expand().toString(), contains('biggest'));
-    expect(new BoxConstraints().toString(), contains('unconstrained'));
-    expect(new BoxConstraints.tightFor(width: 50.0).toString(), contains('w=50'));
+    expect(const BoxConstraints().toString(), contains('unconstrained'));
+    expect(const BoxConstraints.tightFor(width: 50.0).toString(), contains('w=50'));
   });
 
   test('BoxConstraints copyWith', () {
-    BoxConstraints constraints = new BoxConstraints(
+    BoxConstraints constraints = const BoxConstraints(
       minWidth: 3.0,
       maxWidth: 7.0,
       minHeight: 11.0,
@@ -36,7 +36,7 @@ void main() {
   });
 
   test('BoxConstraints operators', () {
-    BoxConstraints constraints = new BoxConstraints(
+    BoxConstraints constraints = const BoxConstraints(
       minWidth: 3.0,
       maxWidth: 7.0,
       minHeight: 11.0,
@@ -62,7 +62,7 @@ void main() {
 
   test('BoxConstraints lerp', () {
     expect(BoxConstraints.lerp(null, null, 0.5), isNull);
-    BoxConstraints constraints = new BoxConstraints(
+    BoxConstraints constraints = const BoxConstraints(
       minWidth: 3.0,
       maxWidth: 7.0,
       minHeight: 11.0,
@@ -78,7 +78,7 @@ void main() {
     expect(copy.maxWidth, 3.5);
     expect(copy.minHeight, 5.5);
     expect(copy.maxHeight, 8.5);
-    copy = BoxConstraints.lerp(new BoxConstraints(
+    copy = BoxConstraints.lerp(const BoxConstraints(
       minWidth: 13.0,
       maxWidth: 17.0,
       minHeight: 111.0,
@@ -91,7 +91,7 @@ void main() {
   });
 
   test('BoxConstraints normalize', () {
-    BoxConstraints constraints = new BoxConstraints(
+    BoxConstraints constraints = const BoxConstraints(
       minWidth: 3.0,
       maxWidth: 2.0,
       minHeight: 11.0,

packages/flutter/test/rendering/box_test.dart

@@ -27,16 +27,16 @@ void main() {
 
   test('Flex and padding', () {
     RenderBox size = new RenderConstrainedBox(
-      additionalConstraints: new BoxConstraints().tighten(height: 100.0),
+      additionalConstraints: const BoxConstraints().tighten(height: 100.0),
     );
     RenderBox inner = new RenderDecoratedBox(
-      decoration: new BoxDecoration(
+      decoration: const BoxDecoration(
         backgroundColor: const Color(0xFF00FF00),
       ),
       child: size,
     );
     RenderBox padding = new RenderPadding(
-      padding: new EdgeInsets.all(50.0),
+      padding: const EdgeInsets.all(50.0),
       child: inner,
     );
     RenderBox flex = new RenderFlex(
@@ -45,7 +45,7 @@ void main() {
       crossAxisAlignment: CrossAxisAlignment.stretch,
     );
     RenderBox outer = new RenderDecoratedBox(
-      decoration: new BoxDecoration(
+      decoration: const BoxDecoration(
         backgroundColor: const Color(0xFF0000FF)
       ),
       child: flex,
@@ -67,14 +67,14 @@ void main() {
 
   test("should not have a 0 sized colored Box", () {
     RenderBox coloredBox = new RenderDecoratedBox(
-      decoration: new BoxDecoration(),
+      decoration: const BoxDecoration(),
     );
     RenderBox paddingBox = new RenderPadding(
       padding: const EdgeInsets.all(10.0),
       child: coloredBox,
     );
     RenderBox root = new RenderDecoratedBox(
-      decoration: new BoxDecoration(),
+      decoration: const BoxDecoration(),
       child: paddingBox,
     );
     layout(root);
@@ -84,7 +84,7 @@ void main() {
 
   test("reparenting should clear position", () {
     RenderDecoratedBox coloredBox = new RenderDecoratedBox(
-      decoration: new BoxDecoration(),
+      decoration: const BoxDecoration(),
     );
 
     RenderPadding paddedBox = new RenderPadding(

packages/flutter/test/rendering/dynamic_intrinsics_test.dart

@@ -66,7 +66,7 @@ void main() {
           child: inner = new RenderFixedSize()
         )
       ),
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 0.0,
         minHeight: 0.0,
         maxWidth: 1000.0,

packages/flutter/test/rendering/flex_test.dart

@@ -9,7 +9,7 @@ import 'rendering_tester.dart';
 
 void main() {
   test('Overconstrained flex', () {
-    RenderDecoratedBox box = new RenderDecoratedBox(decoration: new BoxDecoration());
+    RenderDecoratedBox box = new RenderDecoratedBox(decoration: const BoxDecoration());
     RenderFlex flex = new RenderFlex(children: <RenderBox>[box]);
     layout(flex, constraints: const BoxConstraints(
       minWidth: 200.0, maxWidth: 200.0, minHeight: 200.0, maxHeight: 200.0)
@@ -26,13 +26,13 @@ void main() {
     RenderFlex flex = new RenderFlex(
       direction: Axis.vertical,
       children: <RenderBox>[
-        new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(height: 200.0)),
+        new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(height: 200.0)),
         flexible,
       ]
     );
     FlexParentData flexParentData = flexible.parentData;
     flexParentData.flex = 1;
-    BoxConstraints viewport = new BoxConstraints(maxHeight: 100.0, maxWidth: 100.0);
+    BoxConstraints viewport = const BoxConstraints(maxHeight: 100.0, maxWidth: 100.0);
     layout(flex, constraints: viewport);
     expect(flexible.size.height, equals(0.0));
     expect(flex.getMinIntrinsicHeight(100.0), equals(200.0));
@@ -48,13 +48,13 @@ void main() {
     RenderFlex flex = new RenderFlex(
       direction: Axis.horizontal,
       children: <RenderBox>[
-        new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 200.0)),
+        new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 200.0)),
         flexible,
       ]
     );
     FlexParentData flexParentData = flexible.parentData;
     flexParentData.flex = 1;
-    BoxConstraints viewport = new BoxConstraints(maxHeight: 100.0, maxWidth: 100.0);
+    BoxConstraints viewport = const BoxConstraints(maxHeight: 100.0, maxWidth: 100.0);
     layout(flex, constraints: viewport);
     expect(flexible.size.width, equals(0.0));
     expect(flex.getMinIntrinsicHeight(100.0), equals(0.0));
@@ -70,7 +70,7 @@ void main() {
         new RenderAspectRatio(aspectRatio: 1.0),
       ]
     );
-    BoxConstraints viewport = new BoxConstraints(maxHeight: 200.0, maxWidth: 1000.0);
+    BoxConstraints viewport = const BoxConstraints(maxHeight: 200.0, maxWidth: 1000.0);
     layout(flex, constraints: viewport);
     expect(flex.getMaxIntrinsicWidth(200.0), equals(0.0));
   });
@@ -85,8 +85,8 @@ void main() {
   });
 
   test('Parent data', () {
-    RenderDecoratedBox box1 = new RenderDecoratedBox(decoration: new BoxDecoration());
-    RenderDecoratedBox box2 = new RenderDecoratedBox(decoration: new BoxDecoration());
+    RenderDecoratedBox box1 = new RenderDecoratedBox(decoration: const BoxDecoration());
+    RenderDecoratedBox box2 = new RenderDecoratedBox(decoration: const BoxDecoration());
     RenderFlex flex = new RenderFlex(children: <RenderBox>[box1, box2]);
     layout(flex, constraints: const BoxConstraints(
       minWidth: 0.0, maxWidth: 100.0, minHeight: 0.0, maxHeight: 100.0)
@@ -107,8 +107,8 @@ void main() {
   });
 
   test('Stretch', () {
-    RenderDecoratedBox box1 = new RenderDecoratedBox(decoration: new BoxDecoration());
-    RenderDecoratedBox box2 = new RenderDecoratedBox(decoration: new BoxDecoration());
+    RenderDecoratedBox box1 = new RenderDecoratedBox(decoration: const BoxDecoration());
+    RenderDecoratedBox box2 = new RenderDecoratedBox(decoration: const BoxDecoration());
     RenderFlex flex = new RenderFlex();
     flex.setupParentData(box2);
     final FlexParentData box2ParentData = box2.parentData;
@@ -138,9 +138,9 @@ void main() {
   });
 
   test('Space evenly', () {
-    RenderConstrainedBox box1 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
-    RenderConstrainedBox box2 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
-    RenderConstrainedBox box3 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box1 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box2 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box3 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
     RenderFlex flex = new RenderFlex(mainAxisAlignment: MainAxisAlignment.spaceEvenly);
     flex.addAll(<RenderBox>[box1, box2, box3]);
     layout(flex, constraints: const BoxConstraints(
@@ -168,9 +168,9 @@ void main() {
   });
 
   test('Fit.loose', () {
-    RenderConstrainedBox box1 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
-    RenderConstrainedBox box2 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
-    RenderConstrainedBox box3 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box1 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box2 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box3 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
     RenderFlex flex = new RenderFlex(mainAxisAlignment: MainAxisAlignment.spaceBetween);
     flex.addAll(<RenderBox>[box1, box2, box3]);
     layout(flex, constraints: const BoxConstraints(
@@ -204,7 +204,7 @@ void main() {
     expect(getOffset(box3).dx, equals(400.0));
     expect(box3.size.width, equals(100.0));
 
-    box1.additionalConstraints = new BoxConstraints.tightFor(width: 1000.0, height: 100.0);
+    box1.additionalConstraints = const BoxConstraints.tightFor(width: 1000.0, height: 100.0);
 
     pumpFrame();
     expect(getOffset(box1).dx, equals(0.0));
@@ -216,9 +216,9 @@ void main() {
   });
 
   test('Flexible with MainAxisSize.min', () {
-    RenderConstrainedBox box1 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
-    RenderConstrainedBox box2 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
-    RenderConstrainedBox box3 = new RenderConstrainedBox(additionalConstraints: new BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box1 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box2 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
+    RenderConstrainedBox box3 = new RenderConstrainedBox(additionalConstraints: const BoxConstraints.tightFor(width: 100.0, height: 100.0));
     RenderFlex flex = new RenderFlex(
       mainAxisSize: MainAxisSize.min,
       mainAxisAlignment: MainAxisAlignment.spaceBetween

packages/flutter/test/rendering/grid_test.dart

@@ -10,10 +10,10 @@ import 'rendering_tester.dart';
 void main() {
   test('Basic grid layout test', () {
     List<RenderBox> children = <RenderBox>[
-      new RenderDecoratedBox(decoration: new BoxDecoration()),
-      new RenderDecoratedBox(decoration: new BoxDecoration()),
-      new RenderDecoratedBox(decoration: new BoxDecoration()),
-      new RenderDecoratedBox(decoration: new BoxDecoration())
+      new RenderDecoratedBox(decoration: const BoxDecoration()),
+      new RenderDecoratedBox(decoration: const BoxDecoration()),
+      new RenderDecoratedBox(decoration: const BoxDecoration()),
+      new RenderDecoratedBox(decoration: const BoxDecoration())
     ];
 
     RenderGrid grid = new RenderGrid(

packages/flutter/test/rendering/image_test.dart

@@ -48,7 +48,7 @@ void main() {
 
     image = new RenderImage(image: new SquareImage());
     layout(image,
-          constraints: new BoxConstraints(
+          constraints: const BoxConstraints(
               minWidth: 25.0,
               minHeight: 25.0,
               maxWidth: 100.0,
@@ -58,7 +58,7 @@ void main() {
 
     image = new RenderImage(image: new WideImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 5.0,
               minHeight: 30.0,
               maxWidth: 100.0,
@@ -68,7 +68,7 @@ void main() {
 
     image = new RenderImage(image: new TallImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 50.0,
               minHeight: 5.0,
               maxWidth: 75.0,
@@ -78,7 +78,7 @@ void main() {
 
     image = new RenderImage(image: new WideImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 5.0,
               minHeight: 5.0,
               maxWidth: 100.0,
@@ -88,7 +88,7 @@ void main() {
 
     image = new RenderImage(image: new WideImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 5.0,
               minHeight: 5.0,
               maxWidth: 16.0,
@@ -98,7 +98,7 @@ void main() {
 
     image = new RenderImage(image: new TallImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 5.0,
               minHeight: 5.0,
               maxWidth: 16.0,
@@ -108,7 +108,7 @@ void main() {
 
     image = new RenderImage(image: new SquareImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 4.0,
               minHeight: 4.0,
               maxWidth: 8.0,
@@ -118,7 +118,7 @@ void main() {
 
     image = new RenderImage(image: new WideImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 20.0,
               minHeight: 20.0,
               maxWidth: 30.0,
@@ -128,7 +128,7 @@ void main() {
 
     image = new RenderImage(image: new TallImage());
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
               minWidth: 20.0,
               minHeight: 20.0,
               maxWidth: 30.0,
@@ -142,7 +142,7 @@ void main() {
 
     image = new RenderImage();
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
              minWidth: 25.0,
              minHeight: 25.0,
              maxWidth: 100.0,
@@ -152,7 +152,7 @@ void main() {
 
     image = new RenderImage(width: 50.0);
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
              minWidth: 25.0,
              minHeight: 25.0,
              maxWidth: 100.0,
@@ -162,7 +162,7 @@ void main() {
 
     image = new RenderImage(height: 50.0);
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
              minWidth: 25.0,
              minHeight: 25.0,
              maxWidth: 100.0,
@@ -172,7 +172,7 @@ void main() {
 
     image = new RenderImage(width: 100.0, height: 100.0);
     layout(image,
-           constraints: new BoxConstraints(
+           constraints: const BoxConstraints(
              minWidth: 25.0,
              minHeight: 25.0,
              maxWidth: 75.0,

packages/flutter/test/rendering/independent_layout_test.dart

@@ -18,7 +18,7 @@ class TestLayout {
           onPaint: () { painted = true; }
         ),
         child: child = new RenderConstrainedBox(
-          additionalConstraints: new BoxConstraints.tightFor(height: 10.0, width: 10.0)
+          additionalConstraints: const BoxConstraints.tightFor(height: 10.0, width: 10.0)
         )
       )
     );
@@ -29,7 +29,7 @@ class TestLayout {
 }
 
 void main() {
-  final ViewConfiguration testConfiguration = new ViewConfiguration(
+  final ViewConfiguration testConfiguration = const ViewConfiguration(
     size: const Size(800.0, 600.0),
     devicePixelRatio: 1.0
   );

packages/flutter/test/rendering/intrinsic_width_test.dart

@@ -45,10 +45,10 @@ class RenderTestBox extends RenderBox {
 
 void main() {
   test('Shrink-wrapping width', () {
-    RenderBox child = new RenderTestBox(new BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
+    RenderBox child = new RenderTestBox(const BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
     RenderBox parent = new RenderIntrinsicWidth(child: child);
     layout(parent,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 5.0,
         minHeight: 8.0,
         maxWidth: 500.0,
@@ -80,10 +80,10 @@ void main() {
   });
 
   test('Shrink-wrapping width (stepped width)', () {
-    RenderBox child = new RenderTestBox(new BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
+    RenderBox child = new RenderTestBox(const BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
     RenderBox parent = new RenderIntrinsicWidth(child: child, stepWidth: 47.0);
     layout(parent,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 5.0,
         minHeight: 8.0,
         maxWidth: 500.0,
@@ -115,10 +115,10 @@ void main() {
   });
 
   test('Shrink-wrapping width (stepped height)', () {
-    RenderBox child = new RenderTestBox(new BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
+    RenderBox child = new RenderTestBox(const BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
     RenderBox parent = new RenderIntrinsicWidth(child: child, stepHeight: 47.0);
     layout(parent,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 5.0,
         minHeight: 8.0,
         maxWidth: 500.0,
@@ -150,10 +150,10 @@ void main() {
   });
 
   test('Shrink-wrapping width (stepped everything)', () {
-    RenderBox child = new RenderTestBox(new BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
+    RenderBox child = new RenderTestBox(const BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
     RenderBox parent = new RenderIntrinsicWidth(child: child, stepHeight: 47.0, stepWidth: 37.0);
     layout(parent,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 5.0,
         minHeight: 8.0,
         maxWidth: 500.0,
@@ -185,10 +185,10 @@ void main() {
   });
 
   test('Shrink-wrapping height', () {
-    RenderBox child = new RenderTestBox(new BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
+    RenderBox child = new RenderTestBox(const BoxConstraints(minWidth: 10.0, maxWidth: 100.0, minHeight: 20.0, maxHeight: 200.0));
     RenderBox parent = new RenderIntrinsicHeight(child: child);
     layout(parent,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 5.0,
         minHeight: 8.0,
         maxWidth: 500.0,
@@ -221,7 +221,7 @@ void main() {
 
   test('Padding and boring intrinsics', () {
     RenderBox box = new RenderPadding(
-      padding: new EdgeInsets.all(15.0),
+      padding: const EdgeInsets.all(15.0),
       child: new RenderSizedBox(const Size(20.0, 20.0))
     );
 
@@ -248,7 +248,7 @@ void main() {
     // also a smoke test:
     layout(
       box,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 10.0,
         minHeight: 10.0,
         maxWidth: 10.0,
@@ -259,7 +259,7 @@ void main() {
 
   test('Padding and interesting intrinsics', () {
     RenderBox box = new RenderPadding(
-      padding: new EdgeInsets.all(15.0),
+      padding: const EdgeInsets.all(15.0),
       child: new RenderAspectRatio(aspectRatio: 1.0)
     );
 
@@ -286,7 +286,7 @@ void main() {
     // also a smoke test:
     layout(
       box,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 10.0,
         minHeight: 10.0,
         maxWidth: 10.0,
@@ -297,7 +297,7 @@ void main() {
 
   test('Padding and boring intrinsics', () {
     RenderBox box = new RenderPadding(
-      padding: new EdgeInsets.all(15.0),
+      padding: const EdgeInsets.all(15.0),
       child: new RenderSizedBox(const Size(20.0, 20.0))
     );
 
@@ -324,7 +324,7 @@ void main() {
     // also a smoke test:
     layout(
       box,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 10.0,
         minHeight: 10.0,
         maxWidth: 10.0,
@@ -335,7 +335,7 @@ void main() {
 
   test('Padding and interesting intrinsics', () {
     RenderBox box = new RenderPadding(
-      padding: new EdgeInsets.all(15.0),
+      padding: const EdgeInsets.all(15.0),
       child: new RenderAspectRatio(aspectRatio: 1.0)
     );
 
@@ -362,7 +362,7 @@ void main() {
     // also a smoke test:
     layout(
       box,
-      constraints: new BoxConstraints(
+      constraints: const BoxConstraints(
         minWidth: 10.0,
         minHeight: 10.0,
         maxWidth: 10.0,

packages/flutter/test/rendering/limited_box_test.dart

@@ -11,7 +11,7 @@ import 'rendering_tester.dart';
 void main() {
   test('parent max size is unconstrained', () {
     RenderBox child = new RenderConstrainedBox(
-      additionalConstraints: new BoxConstraints.tightFor(width: 300.0, height: 400.0)
+      additionalConstraints: const BoxConstraints.tightFor(width: 300.0, height: 400.0)
     );
     RenderBox parent = new RenderConstrainedOverflowBox(
       minWidth: 0.0,
@@ -31,7 +31,7 @@ void main() {
 
   test('parent maxWidth is unconstrained', () {
     RenderBox child = new RenderConstrainedBox(
-      additionalConstraints: new BoxConstraints.tightFor(width: 300.0, height: 400.0)
+      additionalConstraints: const BoxConstraints.tightFor(width: 300.0, height: 400.0)
     );
     RenderBox parent = new RenderConstrainedOverflowBox(
       minWidth: 0.0,
@@ -51,7 +51,7 @@ void main() {
 
   test('parent maxHeight is unconstrained', () {
     RenderBox child = new RenderConstrainedBox(
-      additionalConstraints: new BoxConstraints.tightFor(width: 300.0, height: 400.0)
+      additionalConstraints: const BoxConstraints.tightFor(width: 300.0, height: 400.0)
     );
     RenderBox parent = new RenderConstrainedOverflowBox(
       minWidth: 500.0,

packages/flutter/test/rendering/non_render_object_root_test.dart

@@ -48,7 +48,7 @@ void main() {
     RealRoot root = new RealRoot(
       child = new RenderPositionedBox(
         alignment: FractionalOffset.center,
-        child: new RenderSizedBox(new Size(100.0, 100.0))
+        child: new RenderSizedBox(const Size(100.0, 100.0))
       )
     );
     root.attach(new PipelineOwner());

packages/flutter/test/rendering/offstage_test.dart

@@ -21,7 +21,7 @@ void main() {
             onPaint: () { painted = true; }
           ),
           child: child = new RenderConstrainedBox(
-            additionalConstraints: new BoxConstraints.tightFor(height: 10.0, width: 10.0)
+            additionalConstraints: const BoxConstraints.tightFor(height: 10.0, width: 10.0)
           )
         )
       )

packages/flutter/test/rendering/overflow_test.dart

@@ -15,7 +15,7 @@ void main() {
 
     root = new RenderPositionedBox(
       child: new RenderCustomPaint(
-        child: child = text = new RenderParagraph(new TextSpan(text: 'Hello World')),
+        child: child = text = new RenderParagraph(const TextSpan(text: 'Hello World')),
         painter: new TestCallbackPainter(
           onPaint: () {
             baseline1 = child.getDistanceToBaseline(TextBaseline.alphabetic);
@@ -29,7 +29,7 @@ void main() {
     root = new RenderPositionedBox(
       child: new RenderCustomPaint(
         child: child = new RenderConstrainedOverflowBox(
-          child: text = new RenderParagraph(new TextSpan(text: 'Hello World')),
+          child: text = new RenderParagraph(const TextSpan(text: 'Hello World')),
           maxHeight: height1 / 2.0,
           alignment: const FractionalOffset(0.0, 0.0)
         ),

packages/flutter/test/rendering/paragraph_intrinsics_test.dart

@@ -8,8 +8,8 @@ import 'package:test/test.dart';
 void main() {
   test('block and paragraph intrinsics', () {
     final RenderParagraph paragraph = new RenderParagraph(
-      new TextSpan(
-        style: new TextStyle(height: 1.0),
+      const TextSpan(
+        style: const TextStyle(height: 1.0),
         text: 'Hello World'
       )
     );

packages/flutter/test/rendering/positioned_box_test.dart

@@ -10,11 +10,11 @@ import 'rendering_tester.dart';
 void main() {
   test('RenderPositionedBox expands', () {
     RenderConstrainedBox sizer = new RenderConstrainedBox(
-      additionalConstraints: new BoxConstraints.tight(new Size(100.0, 100.0)),
-      child: new RenderDecoratedBox(decoration: new BoxDecoration())
+      additionalConstraints: new BoxConstraints.tight(const Size(100.0, 100.0)),
+      child: new RenderDecoratedBox(decoration: const BoxDecoration())
     );
     RenderPositionedBox positioner = new RenderPositionedBox(child: sizer);
-    layout(positioner, constraints: new BoxConstraints.loose(new Size(200.0, 200.0)));
+    layout(positioner, constraints: new BoxConstraints.loose(const Size(200.0, 200.0)));
 
     expect(positioner.size.width, equals(200.0), reason: "positioner width");
     expect(positioner.size.height, equals(200.0), reason: "positioner height");
@@ -22,11 +22,11 @@ void main() {
 
   test('RenderPositionedBox shrink wraps', () {
     RenderConstrainedBox sizer = new RenderConstrainedBox(
-      additionalConstraints: new BoxConstraints.tight(new Size(100.0, 100.0)),
-      child: new RenderDecoratedBox(decoration: new BoxDecoration())
+      additionalConstraints: new BoxConstraints.tight(const Size(100.0, 100.0)),
+      child: new RenderDecoratedBox(decoration: const BoxDecoration())
     );
     RenderPositionedBox positioner = new RenderPositionedBox(child: sizer, widthFactor: 1.0);
-    layout(positioner, constraints: new BoxConstraints.loose(new Size(200.0, 200.0)));
+    layout(positioner, constraints: new BoxConstraints.loose(const Size(200.0, 200.0)));
 
     expect(positioner.size.width, equals(100.0), reason: "positioner width");
     expect(positioner.size.height, equals(200.0), reason: "positioner height");
@@ -47,11 +47,11 @@ void main() {
 
   test('RenderPositionedBox width and height factors', () {
     RenderConstrainedBox sizer = new RenderConstrainedBox(
-      additionalConstraints: new BoxConstraints.tight(new Size(100.0, 100.0)),
-      child: new RenderDecoratedBox(decoration: new BoxDecoration())
+      additionalConstraints: new BoxConstraints.tight(const Size(100.0, 100.0)),
+      child: new RenderDecoratedBox(decoration: const BoxDecoration())
     );
     RenderPositionedBox positioner = new RenderPositionedBox(child: sizer, widthFactor: 1.0, heightFactor: 0.0);
-    layout(positioner, constraints: new BoxConstraints.loose(new Size(200.0, 200.0)));
+    layout(positioner, constraints: new BoxConstraints.loose(const Size(200.0, 200.0)));
 
     expect(positioner.size.width, equals(100.0));
     expect(positioner.size.height, equals(0.0));

packages/flutter/test/rendering/reattach_test.dart

@@ -19,7 +19,7 @@ class TestTree {
       // relayout/repaint of the new parent node to satisfy the test.
       child: new RenderRepaintBoundary(
         child: new RenderConstrainedBox(
-          additionalConstraints: new BoxConstraints.tightFor(height: 20.0, width: 20.0),
+          additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0),
           child: new RenderRepaintBoundary(
             child: new RenderCustomPaint(
               painter: new TestCallbackPainter(
@@ -27,7 +27,7 @@ class TestTree {
               ),
               child: new RenderPositionedBox(
                 child: child = new RenderConstrainedBox(
-                  additionalConstraints: new BoxConstraints.tightFor(height: 20.0, width: 20.0)
+                  additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0)
                 )
               )
             )
@@ -63,7 +63,7 @@ class TestCompositingBitsTree {
               onPaint: () { painted = true; }
             ),
             child: child = new RenderConstrainedBox(
-              additionalConstraints: new BoxConstraints.tightFor(height: 20.0, width: 20.0)
+              additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0)
             )
           )
         )
@@ -87,7 +87,7 @@ void main() {
     expect(testTree.child.owner, isNull);
     // Dirty one of the elements
     testTree.child.additionalConstraints =
-      new BoxConstraints.tightFor(height: 5.0, width: 5.0);
+      const BoxConstraints.tightFor(height: 5.0, width: 5.0);
     // Lay out again
     layout(testTree.root, phase: EnginePhase.layout);
     expect(testTree.child.size, equals(const Size(5.0, 5.0)));

packages/flutter/test/rendering/stack_test.dart

@@ -14,14 +14,14 @@ void main() {
     );
 
     RenderBox red = new RenderDecoratedBox(
-      decoration: new BoxDecoration(
+      decoration: const BoxDecoration(
         backgroundColor: const Color(0xFFFF0000)
       ),
       child: size
     );
 
     RenderBox green = new RenderDecoratedBox(
-      decoration: new BoxDecoration(
+      decoration: const BoxDecoration(
         backgroundColor: const Color(0xFFFF0000)
       )
     );

packages/flutter/test/rendering/table_test.dart

@@ -45,7 +45,7 @@ void main() {
 
     pumpFrame();
 
-    expect(table.size, equals(new Size(100.0, 200.0)));
+    expect(table.size, equals(const Size(100.0, 200.0)));
 
     table.setChild(0, 0, sizedBox(10.0, 30.0));
     table.setChild(1, 0, sizedBox(20.0, 20.0));
@@ -53,7 +53,7 @@ void main() {
 
     pumpFrame();
 
-    expect(table.size, equals(new Size(130.0, 230.0)));
+    expect(table.size, equals(const Size(130.0, 230.0)));
   });
 
   test('Table test: removing cells', () {

packages/flutter/test/rendering/transform_test.dart

@@ -21,7 +21,7 @@ void main() {
       alignment: FractionalOffset.center,
       child: inner = new RenderSizedBox(const Size(100.0, 100.0)),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
     expect(inner.globalToLocal(const Point(0.0, 0.0)), equals(const Point(0.0, 0.0)));
     expect(inner.globalToLocal(const Point(100.0, 100.0)), equals(const Point(100.0, 100.0)));
     expect(inner.globalToLocal(const Point(25.0, 75.0)), equals(const Point(25.0, 75.0)));
@@ -38,11 +38,11 @@ void main() {
       transform: new Matrix4.identity(),
       alignment: FractionalOffset.center,
       child: new RenderPadding(
-        padding: new EdgeInsets.only(left: 20.0),
+        padding: const EdgeInsets.only(left: 20.0),
         child: inner = new RenderSizedBox(const Size(80.0, 100.0)),
       ),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
     expect(inner.globalToLocal(const Point(0.0, 0.0)), equals(const Point(-20.0, 0.0)));
     expect(inner.globalToLocal(const Point(100.0, 100.0)), equals(const Point(80.0, 100.0)));
     expect(inner.globalToLocal(const Point(25.0, 75.0)), equals(const Point(5.0, 75.0)));
@@ -60,7 +60,7 @@ void main() {
       alignment: FractionalOffset.center,
       child: inner = new RenderSizedBox(const Size(100.0, 100.0)),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
     expect(inner.globalToLocal(const Point(0.0, 0.0)), equals(const Point(-50.0, -200.0)));
     expect(inner.globalToLocal(const Point(100.0, 100.0)), equals(const Point(50.0, -100.0)));
     expect(inner.globalToLocal(const Point(25.0, 75.0)), equals(const Point(-25.0, -125.0)));
@@ -77,11 +77,11 @@ void main() {
       transform: new Matrix4.translationValues(50.0, 200.0, 0.0),
       alignment: FractionalOffset.center,
       child: new RenderPadding(
-        padding: new EdgeInsets.only(left: 20.0),
+        padding: const EdgeInsets.only(left: 20.0),
         child: inner = new RenderSizedBox(const Size(80.0, 100.0)),
       ),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
     expect(inner.globalToLocal(const Point(0.0, 0.0)), equals(const Point(-70.0, -200.0)));
     expect(inner.globalToLocal(const Point(100.0, 100.0)), equals(const Point(30.0, -100.0)));
     expect(inner.globalToLocal(const Point(25.0, 75.0)), equals(const Point(-45.0, -125.0)));
@@ -99,7 +99,7 @@ void main() {
       alignment: FractionalOffset.center,
       child: inner = new RenderSizedBox(const Size(100.0, 100.0)),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
     expect(round(inner.globalToLocal(const Point(0.0, 0.0))), equals(const Point(100.0, 100.0)));
     expect(round(inner.globalToLocal(const Point(100.0, 100.0))), equals(const Point(0.0, 0.0)));
     expect(round(inner.globalToLocal(const Point(25.0, 75.0))), equals(const Point(75.0, 25.0)));
@@ -116,11 +116,11 @@ void main() {
       transform: new Matrix4.rotationZ(math.PI),
       alignment: FractionalOffset.center,
       child: new RenderPadding(
-        padding: new EdgeInsets.only(left: 20.0),
+        padding: const EdgeInsets.only(left: 20.0),
         child: inner = new RenderSizedBox(const Size(80.0, 100.0)),
       ),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
     expect(round(inner.globalToLocal(const Point(0.0, 0.0))), equals(const Point(80.0, 100.0)));
     expect(round(inner.globalToLocal(const Point(100.0, 100.0))), equals(const Point(-20.0, 0.0)));
     expect(round(inner.globalToLocal(const Point(25.0, 75.0))), equals(const Point(55.0, 25.0)));
@@ -138,7 +138,7 @@ void main() {
       alignment: FractionalOffset.center,
       child: inner = new RenderSizedBox(const Size(100.0, 100.0)),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
 
     expect(round(inner.globalToLocal(const Point(25.0, 50.0))), equals(const Point(25.0, 50.0)));
     expect(inner.globalToLocal(const Point(25.0, 17.0)).y, greaterThan(0.0));
@@ -155,7 +155,7 @@ void main() {
       alignment: FractionalOffset.center,
       child: inner = new RenderSizedBox(const Size(100.0, 100.0)),
     );
-    layout(sizer, constraints: new BoxConstraints.tight(new Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
+    layout(sizer, constraints: new BoxConstraints.tight(const Size(100.0, 100.0)), alignment: FractionalOffset.topLeft);
 
     // the inner widget has a height of about half a pixel at this rotation, so
     // everything should end up around the middle of the outer box.

packages/flutter/test/rendering/viewport_test.dart

@@ -10,7 +10,7 @@ import 'rendering_tester.dart';
 void main() {
   test('Should be able to hit with positive paint offset', () {
     RenderBox green = new RenderDecoratedBox(
-      decoration: new BoxDecoration(
+      decoration: const BoxDecoration(
         backgroundColor: const Color(0xFF00FF00)
       ));
 
@@ -19,22 +19,22 @@ void main() {
       child: green);
 
     RenderBox red = new RenderDecoratedBox(
-      decoration: new BoxDecoration(
+      decoration: const BoxDecoration(
         backgroundColor: const Color(0xFFFF0000)
       ),
       child: size);
 
-    RenderViewport viewport = new RenderViewport(child: red, paintOffset: new Offset(0.0, 10.0));
+    RenderViewport viewport = new RenderViewport(child: red, paintOffset: const Offset(0.0, 10.0));
     layout(viewport);
 
     HitTestResult result;
 
     result = new HitTestResult();
-    renderer.renderView.hitTest(result, position: new Point(15.0, 0.0));
+    renderer.renderView.hitTest(result, position: const Point(15.0, 0.0));
     expect(result.path.first.target.runtimeType, equals(RenderView));
 
     result = new HitTestResult();
-    renderer.renderView.hitTest(result, position: new Point(15.0, 15.0));
+    renderer.renderView.hitTest(result, position: const Point(15.0, 15.0));
     expect(result.path.first.target, equals(green));
   });
 }

packages/flutter/test/services/image_cache_resize_test.dart

@@ -12,10 +12,10 @@ void main() {
 
     imageCache.maximumSize = 2;
 
-    TestImageInfo a = await extractOneFrame(new TestProvider(1, 1).resolve(ImageConfiguration.empty));
-    TestImageInfo b = await extractOneFrame(new TestProvider(2, 2).resolve(ImageConfiguration.empty));
-    TestImageInfo c = await extractOneFrame(new TestProvider(3, 3).resolve(ImageConfiguration.empty));
-    TestImageInfo d = await extractOneFrame(new TestProvider(1, 4).resolve(ImageConfiguration.empty));
+    TestImageInfo a = await extractOneFrame(const TestProvider(1, 1).resolve(ImageConfiguration.empty));
+    TestImageInfo b = await extractOneFrame(const TestProvider(2, 2).resolve(ImageConfiguration.empty));
+    TestImageInfo c = await extractOneFrame(const TestProvider(3, 3).resolve(ImageConfiguration.empty));
+    TestImageInfo d = await extractOneFrame(const TestProvider(1, 4).resolve(ImageConfiguration.empty));
     expect(a.value, equals(1));
     expect(b.value, equals(2));
     expect(c.value, equals(3));
@@ -23,18 +23,18 @@ void main() {
 
     imageCache.maximumSize = 0;
 
-    TestImageInfo e = await extractOneFrame(new TestProvider(1, 5).resolve(ImageConfiguration.empty));
+    TestImageInfo e = await extractOneFrame(const TestProvider(1, 5).resolve(ImageConfiguration.empty));
     expect(e.value, equals(5));
 
-    TestImageInfo f = await extractOneFrame(new TestProvider(1, 6).resolve(ImageConfiguration.empty));
+    TestImageInfo f = await extractOneFrame(const TestProvider(1, 6).resolve(ImageConfiguration.empty));
     expect(f.value, equals(6));
 
     imageCache.maximumSize = 3;
 
-    TestImageInfo g = await extractOneFrame(new TestProvider(1, 7).resolve(ImageConfiguration.empty));
+    TestImageInfo g = await extractOneFrame(const TestProvider(1, 7).resolve(ImageConfiguration.empty));
     expect(g.value, equals(7));
 
-    TestImageInfo h = await extractOneFrame(new TestProvider(1, 8).resolve(ImageConfiguration.empty));
+    TestImageInfo h = await extractOneFrame(const TestProvider(1, 8).resolve(ImageConfiguration.empty));
     expect(h.value, equals(7));
 
   });

packages/flutter/test/services/image_cache_test.dart

@@ -12,69 +12,69 @@ void main() {
 
     imageCache.maximumSize = 3;
 
-    TestImageInfo a = await extractOneFrame(new TestProvider(1, 1).resolve(ImageConfiguration.empty));
+    TestImageInfo a = await extractOneFrame(const TestProvider(1, 1).resolve(ImageConfiguration.empty));
     expect(a.value, equals(1));
-    TestImageInfo b = await extractOneFrame(new TestProvider(1, 2).resolve(ImageConfiguration.empty));
+    TestImageInfo b = await extractOneFrame(const TestProvider(1, 2).resolve(ImageConfiguration.empty));
     expect(b.value, equals(1));
-    TestImageInfo c = await extractOneFrame(new TestProvider(1, 3).resolve(ImageConfiguration.empty));
+    TestImageInfo c = await extractOneFrame(const TestProvider(1, 3).resolve(ImageConfiguration.empty));
     expect(c.value, equals(1));
-    TestImageInfo d = await extractOneFrame(new TestProvider(1, 4).resolve(ImageConfiguration.empty));
+    TestImageInfo d = await extractOneFrame(const TestProvider(1, 4).resolve(ImageConfiguration.empty));
     expect(d.value, equals(1));
-    TestImageInfo e = await extractOneFrame(new TestProvider(1, 5).resolve(ImageConfiguration.empty));
+    TestImageInfo e = await extractOneFrame(const TestProvider(1, 5).resolve(ImageConfiguration.empty));
     expect(e.value, equals(1));
-    TestImageInfo f = await extractOneFrame(new TestProvider(1, 6).resolve(ImageConfiguration.empty));
+    TestImageInfo f = await extractOneFrame(const TestProvider(1, 6).resolve(ImageConfiguration.empty));
     expect(f.value, equals(1));
 
     expect(f, equals(a));
 
     // cache still only has one entry in it: 1(1)
 
-    TestImageInfo g = await extractOneFrame(new TestProvider(2, 7).resolve(ImageConfiguration.empty));
+    TestImageInfo g = await extractOneFrame(const TestProvider(2, 7).resolve(ImageConfiguration.empty));
     expect(g.value, equals(7));
 
     // cache has two entries in it: 1(1), 2(7)
 
-    TestImageInfo h = await extractOneFrame(new TestProvider(1, 8).resolve(ImageConfiguration.empty));
+    TestImageInfo h = await extractOneFrame(const TestProvider(1, 8).resolve(ImageConfiguration.empty));
     expect(h.value, equals(1));
 
     // cache still has two entries in it: 2(7), 1(1)
 
-    TestImageInfo i = await extractOneFrame(new TestProvider(3, 9).resolve(ImageConfiguration.empty));
+    TestImageInfo i = await extractOneFrame(const TestProvider(3, 9).resolve(ImageConfiguration.empty));
     expect(i.value, equals(9));
 
     // cache has three entries in it: 2(7), 1(1), 3(9)
 
-    TestImageInfo j = await extractOneFrame(new TestProvider(1, 10).resolve(ImageConfiguration.empty));
+    TestImageInfo j = await extractOneFrame(const TestProvider(1, 10).resolve(ImageConfiguration.empty));
     expect(j.value, equals(1));
 
     // cache still has three entries in it: 2(7), 3(9), 1(1)
 
-    TestImageInfo k = await extractOneFrame(new TestProvider(4, 11).resolve(ImageConfiguration.empty));
+    TestImageInfo k = await extractOneFrame(const TestProvider(4, 11).resolve(ImageConfiguration.empty));
     expect(k.value, equals(11));
 
     // cache has three entries: 3(9), 1(1), 4(11)
 
-    TestImageInfo l = await extractOneFrame(new TestProvider(1, 12).resolve(ImageConfiguration.empty));
+    TestImageInfo l = await extractOneFrame(const TestProvider(1, 12).resolve(ImageConfiguration.empty));
     expect(l.value, equals(1));
 
     // cache has three entries: 3(9), 4(11), 1(1)
 
-    TestImageInfo m = await extractOneFrame(new TestProvider(2, 13).resolve(ImageConfiguration.empty));
+    TestImageInfo m = await extractOneFrame(const TestProvider(2, 13).resolve(ImageConfiguration.empty));
     expect(m.value, equals(13));
 
     // cache has three entries: 4(11), 1(1), 2(13)
 
-    TestImageInfo n = await extractOneFrame(new TestProvider(3, 14).resolve(ImageConfiguration.empty));
+    TestImageInfo n = await extractOneFrame(const TestProvider(3, 14).resolve(ImageConfiguration.empty));
     expect(n.value, equals(14));
 
     // cache has three entries: 1(1), 2(13), 3(14)
 
-    TestImageInfo o = await extractOneFrame(new TestProvider(4, 15).resolve(ImageConfiguration.empty));
+    TestImageInfo o = await extractOneFrame(const TestProvider(4, 15).resolve(ImageConfiguration.empty));
     expect(o.value, equals(15));
 
     // cache has three entries: 2(13), 3(14), 4(15)
 
-    TestImageInfo p = await extractOneFrame(new TestProvider(1, 16).resolve(ImageConfiguration.empty));
+    TestImageInfo p = await extractOneFrame(const TestProvider(1, 16).resolve(ImageConfiguration.empty));
     expect(p.value, equals(16));
 
     // cache has three entries: 3(14), 4(15), 1(16)

packages/flutter/test/widgets/animated_container_test.dart

@@ -10,12 +10,12 @@ void main() {
   testWidgets('AnimatedContainer control test', (WidgetTester tester) async {
     GlobalKey key = new GlobalKey();
 
-    BoxDecoration decorationA = new BoxDecoration(
-      backgroundColor: new Color(0xFF00FF00)
+    BoxDecoration decorationA = const BoxDecoration(
+      backgroundColor: const Color(0xFF00FF00)
     );
 
-    BoxDecoration decorationB = new BoxDecoration(
-      backgroundColor: new Color(0xFF0000FF)
+    BoxDecoration decorationB = const BoxDecoration(
+      backgroundColor: const Color(0xFF0000FF)
     );
 
     BoxDecoration actualDecoration;
@@ -54,41 +54,41 @@ void main() {
     await tester.pumpWidget(
       new AnimatedContainer(
         duration: const Duration(milliseconds: 200),
-        decoration: new BoxDecoration(
-          backgroundColor: new Color(0xFF00FF00)
+        decoration: const BoxDecoration(
+          backgroundColor: const Color(0xFF00FF00)
         )
       )
     );
     expect(tester.binding.transientCallbackCount, 0);
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(tester.binding.transientCallbackCount, 0);
     await tester.pumpWidget(
       new AnimatedContainer(
         duration: const Duration(milliseconds: 200),
-        decoration: new BoxDecoration(
-          backgroundColor: new Color(0xFF00FF00)
+        decoration: const BoxDecoration(
+          backgroundColor: const Color(0xFF00FF00)
         )
       )
     );
     expect(tester.binding.transientCallbackCount, 0);
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(tester.binding.transientCallbackCount, 0);
     await tester.pumpWidget(
       new AnimatedContainer(
         duration: const Duration(milliseconds: 200),
-        decoration: new BoxDecoration(
-          backgroundColor: new Color(0xFF0000FF)
+        decoration: const BoxDecoration(
+          backgroundColor: const Color(0xFF0000FF)
         )
       )
     );
     expect(tester.binding.transientCallbackCount, 1); // this is the only time an animation should have started!
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(tester.binding.transientCallbackCount, 0);
     await tester.pumpWidget(
       new AnimatedContainer(
         duration: const Duration(milliseconds: 200),
-        decoration: new BoxDecoration(
-          backgroundColor: new Color(0xFF0000FF)
+        decoration: const BoxDecoration(
+          backgroundColor: const Color(0xFF0000FF)
         )
       )
     );
@@ -108,13 +108,13 @@ void main() {
     );
 
     await tester.pump();
-    await tester.pump(new Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
 
     RenderBox text = tester.renderObject(find.text('X'));
     expect(text.size.width, equals(100.0));
     expect(text.size.height, equals(100.0));
 
-    await tester.pump(new Duration(milliseconds: 1000));
+    await tester.pump(const Duration(milliseconds: 1000));
 
     await tester.pumpWidget(
       new Center(
@@ -127,7 +127,7 @@ void main() {
       )
     );
     await tester.pump();
-    await tester.pump(new Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
 
     text = tester.renderObject(find.text('X'));
     expect(text.size.width, greaterThan(110.0));
@@ -135,7 +135,7 @@ void main() {
     expect(text.size.height, greaterThan(110.0));
     expect(text.size.height, lessThan(190.0));
 
-    await tester.pump(new Duration(milliseconds: 1000));
+    await tester.pump(const Duration(milliseconds: 1000));
 
     expect(text.size.width, equals(200.0));
     expect(text.size.height, equals(200.0));
@@ -151,13 +151,13 @@ void main() {
       )
     );
     await tester.pump();
-    await tester.pump(new Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
 
     expect(text.size.width, equals(200.0));
     expect(text.size.height, greaterThan(110.0));
     expect(text.size.height, lessThan(190.0));
 
-    await tester.pump(new Duration(milliseconds: 1000));
+    await tester.pump(const Duration(milliseconds: 1000));
 
     expect(text.size.width, equals(200.0));
     expect(text.size.height, equals(100.0));

packages/flutter/test/widgets/animated_cross_fade_test.dart

@@ -11,11 +11,11 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new AnimatedCrossFade(
-          firstChild: new SizedBox(
+          firstChild: const SizedBox(
             width: 100.0,
             height: 100.0
           ),
-          secondChild: new SizedBox(
+          secondChild: const SizedBox(
             width: 200.0,
             height: 200.0
           ),
@@ -33,11 +33,11 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new AnimatedCrossFade(
-          firstChild: new SizedBox(
+          firstChild: const SizedBox(
             width: 100.0,
             height: 100.0
           ),
-          secondChild: new SizedBox(
+          secondChild: const SizedBox(
             width: 200.0,
             height: 200.0
           ),
@@ -59,11 +59,11 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new AnimatedCrossFade(
-          firstChild: new SizedBox(
+          firstChild: const SizedBox(
             width: 100.0,
             height: 100.0
           ),
-          secondChild: new SizedBox(
+          secondChild: const SizedBox(
             width: 200.0,
             height: 200.0
           ),

packages/flutter/test/widgets/animated_size_test.dart

@@ -22,7 +22,7 @@ void main() {
         child: new AnimatedSize(
           duration: const Duration(milliseconds: 200),
           vsync: tester,
-          child: new SizedBox(
+          child: const SizedBox(
             width: 100.0,
             height: 100.0
           )
@@ -37,9 +37,9 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new AnimatedSize(
-          duration: new Duration(milliseconds: 200),
+          duration: const Duration(milliseconds: 200),
           vsync: tester,
-          child: new SizedBox(
+          child: const SizedBox(
             width: 200.0,
             height: 200.0
           )
@@ -64,9 +64,9 @@ void main() {
     await tester.pumpWidget(
       new Center(
         child: new AnimatedSize(
-          duration: new Duration(milliseconds: 200),
+          duration: const Duration(milliseconds: 200),
           vsync: tester,
-          child: new SizedBox(
+          child: const SizedBox(
             width: 100.0,
             height: 100.0
           )
@@ -98,7 +98,7 @@ void main() {
           child: new AnimatedSize(
             duration: const Duration(milliseconds: 200),
             vsync: tester,
-            child: new SizedBox(
+            child: const SizedBox(
               width: 100.0,
               height: 100.0
             )
@@ -119,7 +119,7 @@ void main() {
           child: new AnimatedSize(
             duration: const Duration(milliseconds: 200),
             vsync: tester,
-            child: new SizedBox(
+            child: const SizedBox(
               width: 200.0,
               height: 200.0
             )

packages/flutter/test/widgets/aspect_ratio_test.dart

@@ -27,8 +27,8 @@ Future<Size> _getSize(WidgetTester tester, BoxConstraints constraints, double as
 
 void main() {
   testWidgets('Aspect ratio control test', (WidgetTester tester) async {
-    expect(await _getSize(tester, new BoxConstraints.loose(new Size(500.0, 500.0)), 2.0), equals(new Size(500.0, 250.0)));
-    expect(await _getSize(tester, new BoxConstraints.loose(new Size(500.0, 500.0)), 0.5), equals(new Size(250.0, 500.0)));
+    expect(await _getSize(tester, new BoxConstraints.loose(const Size(500.0, 500.0)), 2.0), equals(const Size(500.0, 250.0)));
+    expect(await _getSize(tester, new BoxConstraints.loose(const Size(500.0, 500.0)), 0.5), equals(const Size(250.0, 500.0)));
   });
 
   testWidgets('Aspect ratio infinite width', (WidgetTester tester) async {
@@ -47,6 +47,6 @@ void main() {
       )
     );
     RenderBox box = tester.renderObject(find.byKey(childKey));
-    expect(box.size, equals(new Size(1200.0, 600.0)));
+    expect(box.size, equals(const Size(1200.0, 600.0)));
   });
 }

packages/flutter/test/widgets/banner_test.dart

@@ -18,14 +18,14 @@ class TestCanvas implements Canvas {
 
 void main() {
   test('A Banner with a location of topLeft paints in the top left', () {
-    BannerPainter bannerPainter = new BannerPainter(
+    BannerPainter bannerPainter = const BannerPainter(
       message:"foo",
       location: BannerLocation.topLeft
     );
 
     TestCanvas canvas = new TestCanvas();
 
-    bannerPainter.paint(canvas, new Size(1000.0, 1000.0));
+    bannerPainter.paint(canvas, const Size(1000.0, 1000.0));
 
     Invocation translateCommand = canvas.invocations.firstWhere((Invocation invocation) {
       return invocation.memberName == #translate;
@@ -44,14 +44,14 @@ void main() {
   });
 
   test('A Banner with a location of topRight paints in the top right', () {
-    BannerPainter bannerPainter = new BannerPainter(
+    BannerPainter bannerPainter = const BannerPainter(
       message:"foo",
       location: BannerLocation.topRight
     );
 
     TestCanvas canvas = new TestCanvas();
 
-    bannerPainter.paint(canvas, new Size(1000.0, 1000.0));
+    bannerPainter.paint(canvas, const Size(1000.0, 1000.0));
 
     Invocation translateCommand = canvas.invocations.firstWhere((Invocation invocation) {
       return invocation.memberName == #translate;
@@ -70,14 +70,14 @@ void main() {
   });
 
   test('A Banner with a location of bottomLeft paints in the bottom left', () {
-    BannerPainter bannerPainter = new BannerPainter(
+    BannerPainter bannerPainter = const BannerPainter(
       message:"foo",
       location: BannerLocation.bottomLeft
     );
 
     TestCanvas canvas = new TestCanvas();
 
-    bannerPainter.paint(canvas, new Size(1000.0, 1000.0));
+    bannerPainter.paint(canvas, const Size(1000.0, 1000.0));
 
     Invocation translateCommand = canvas.invocations.firstWhere((Invocation invocation) {
       return invocation.memberName == #translate;
@@ -96,14 +96,14 @@ void main() {
   });
 
   test('A Banner with a location of bottomRight paints in the bottom right', () {
-    BannerPainter bannerPainter = new BannerPainter(
+    BannerPainter bannerPainter = const BannerPainter(
       message:"foo",
       location: BannerLocation.bottomRight
     );
 
     TestCanvas canvas = new TestCanvas();
 
-    bannerPainter.paint(canvas, new Size(1000.0, 1000.0));
+    bannerPainter.paint(canvas, const Size(1000.0, 1000.0));
 
     Invocation translateCommand = canvas.invocations.firstWhere((Invocation invocation) {
       return invocation.memberName == #translate;

packages/flutter/test/widgets/block_test.dart

@@ -74,8 +74,8 @@ void main() {
             onTap: () { ++first; },
             child: new Container(
               height: 2000.0, // more than 600, the height of the test area
-              decoration: new BoxDecoration(
-                backgroundColor: new Color(0xFF00FF00)
+              decoration: const BoxDecoration(
+                backgroundColor: const Color(0xFF00FF00)
               )
             )
           ),
@@ -83,8 +83,8 @@ void main() {
             onTap: () { ++second; },
             child: new Container(
               height: 2000.0, // more than 600, the height of the test area
-              decoration: new BoxDecoration(
-                backgroundColor: new Color(0xFF0000FF)
+              decoration: const BoxDecoration(
+                backgroundColor: const Color(0xFF0000FF)
               )
             )
           )

packages/flutter/test/widgets/bottom_sheet_test.dart

@@ -32,7 +32,7 @@ void main() {
     });
 
     await tester.pump(); // bottom sheet show animation starts
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('BottomSheet'), findsOneWidget);
     expect(showBottomSheetThenCalled, isFalse);
 
@@ -40,8 +40,8 @@ void main() {
     await tester.tap(find.text('BottomSheet'));
     await tester.pump(); // bottom sheet dismiss animation starts
     expect(showBottomSheetThenCalled, isTrue);
-    await tester.pump(new Duration(seconds: 1)); // last frame of animation (sheet is entirely off-screen, but still present)
-    await tester.pump(new Duration(seconds: 1)); // frame after the animation (sheet has been removed)
+    await tester.pump(const Duration(seconds: 1)); // last frame of animation (sheet is entirely off-screen, but still present)
+    await tester.pump(const Duration(seconds: 1)); // frame after the animation (sheet has been removed)
     expect(find.text('BottomSheet'), findsNothing);
 
     showBottomSheetThenCalled = false;
@@ -53,16 +53,16 @@ void main() {
       showBottomSheetThenCalled = true;
     });
     await tester.pump(); // bottom sheet show animation starts
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('BottomSheet'), findsOneWidget);
     expect(showBottomSheetThenCalled, isFalse);
 
     // Tap above the the bottom sheet to dismiss it
-    await tester.tapAt(new Point(20.0, 20.0));
+    await tester.tapAt(const Point(20.0, 20.0));
     await tester.pump(); // bottom sheet dismiss animation starts
     expect(showBottomSheetThenCalled, isTrue);
-    await tester.pump(new Duration(seconds: 1)); // animation done
-    await tester.pump(new Duration(seconds: 1)); // rebuild frame
+    await tester.pump(const Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // rebuild frame
     expect(find.text('BottomSheet'), findsNothing);
   });
 
@@ -82,7 +82,7 @@ void main() {
 
     scaffoldKey.currentState.showBottomSheet((BuildContext context) {
       return new Container(
-        margin: new EdgeInsets.all(40.0),
+        margin: const EdgeInsets.all(40.0),
         child: new Text('BottomSheet')
       );
     }).closed.then((_) {
@@ -97,7 +97,7 @@ void main() {
     expect(showBottomSheetThenCalled, isFalse);
     expect(find.text('BottomSheet'), findsOneWidget);
 
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
 
     expect(showBottomSheetThenCalled, isFalse);
     expect(find.text('BottomSheet'), findsOneWidget);
@@ -113,7 +113,7 @@ void main() {
     expect(showBottomSheetThenCalled, isTrue);
     expect(find.text('BottomSheet'), findsOneWidget);
 
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
 
     expect(showBottomSheetThenCalled, isTrue);
     expect(find.text('BottomSheet'), findsNothing);
@@ -132,19 +132,19 @@ void main() {
 
     scaffoldKey.currentState.showBottomSheet((BuildContext context) {
       return new Container(
-        margin: new EdgeInsets.all(40.0),
+        margin: const EdgeInsets.all(40.0),
         child: new Text('BottomSheet')
       );
     });
 
     await tester.pump(); // bottom sheet show animation starts
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('BottomSheet'), findsOneWidget);
 
     await tester.fling(find.text('BottomSheet'), const Offset(0.0, 400.0), 1000.0);
     await tester.pump(); // drain the microtask queue (Future completion callback)
     await tester.pump(); // bottom sheet dismiss animation starts
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
 
     expect(find.text('BottomSheet'), findsNothing);
   });

packages/flutter/test/widgets/box_decoration_test.dart

@@ -10,7 +10,7 @@ void main() {
   testWidgets('Circles can have uniform borders', (WidgetTester tester) async {
     await tester.pumpWidget(
       new Container(
-        padding: new EdgeInsets.all(50.0),
+        padding: const EdgeInsets.all(50.0),
         decoration: new BoxDecoration(
           shape: BoxShape.circle,
           border: new Border.all(width: 10.0, color: const Color(0x80FF00FF)),

packages/flutter/test/widgets/clip_test.dart

@@ -49,11 +49,11 @@ void main() {
     );
     expect(log, equals(<String>['getClip']));
 
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(log, equals(<String>['getClip']));
     log.clear();
 
-    await tester.tapAt(new Point(100.0, 100.0));
+    await tester.tapAt(const Point(100.0, 100.0));
     expect(log, equals(<String>['tap']));
     log.clear();
   });
@@ -69,11 +69,11 @@ void main() {
     );
     expect(log, equals(<String>[]));
 
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(log, equals(<String>[]));
     log.clear();
 
-    await tester.tapAt(new Point(400.0, 300.0));
+    await tester.tapAt(const Point(400.0, 300.0));
     expect(log, equals(<String>['tap']));
     log.clear();
   });
@@ -92,11 +92,11 @@ void main() {
     );
     expect(log, equals(<String>[]));
 
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(log, equals(<String>[]));
     log.clear();
 
-    await tester.tapAt(new Point(400.0, 300.0));
+    await tester.tapAt(const Point(400.0, 300.0));
     expect(log, equals(<String>['tap']));
     log.clear();
   });
@@ -120,10 +120,10 @@ void main() {
     );
     expect(log, equals(<String>['a']));
 
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(log, equals(<String>['a', 'tap']));
 
-    await tester.tapAt(new Point(100.0, 100.0));
+    await tester.tapAt(const Point(100.0, 100.0));
     expect(log, equals(<String>['a', 'tap']));
 
     await tester.pumpWidget(
@@ -216,10 +216,10 @@ void main() {
     );
     expect(log, equals(<String>['a', 'tap', 'a', 'b', 'c']));
 
-    await tester.tapAt(new Point(30.0, 30.0));
+    await tester.tapAt(const Point(30.0, 30.0));
     expect(log, equals(<String>['a', 'tap', 'a', 'b', 'c', 'tap']));
 
-    await tester.tapAt(new Point(100.0, 100.0));
+    await tester.tapAt(const Point(100.0, 100.0));
     expect(log, equals(<String>['a', 'tap', 'a', 'b', 'c', 'tap']));
   });
 

packages/flutter/test/widgets/custom_multi_child_layout_test.dart

@@ -13,7 +13,7 @@ class TestMultiChildLayoutDelegate extends MultiChildLayoutDelegate {
   Size getSize(BoxConstraints constraints) {
     if (!RenderObject.debugCheckingIntrinsics)
       getSizeConstraints = constraints;
-    return new Size(200.0, 300.0);
+    return const Size(200.0, 300.0);
   }
 
   Size performLayoutSize;
@@ -143,7 +143,7 @@ void main() {
     await tester.pumpWidget(new Center(
       child: new CustomMultiChildLayout(
         key: key,
-        delegate: new PreferredSizeDelegate(preferredSize: new Size(300.0, 200.0))
+        delegate: new PreferredSizeDelegate(preferredSize: const Size(300.0, 200.0))
       )
     ));
 
@@ -154,7 +154,7 @@ void main() {
     await tester.pumpWidget(new Center(
       child: new CustomMultiChildLayout(
         key: key,
-        delegate: new PreferredSizeDelegate(preferredSize: new Size(350.0, 250.0))
+        delegate: new PreferredSizeDelegate(preferredSize: const Size(350.0, 250.0))
       )
     ));
 

packages/flutter/test/widgets/custom_one_child_layout_test.dart

@@ -16,14 +16,14 @@ class TestSingleChildLayoutDelegate extends SingleChildLayoutDelegate {
   Size getSize(BoxConstraints constraints) {
     if (!RenderObject.debugCheckingIntrinsics)
       constraintsFromGetSize = constraints;
-    return new Size(200.0, 300.0);
+    return const Size(200.0, 300.0);
   }
 
   @override
   BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
     assert(!RenderObject.debugCheckingIntrinsics);
     constraintsFromGetConstraintsForChild = constraints;
-    return new BoxConstraints(
+    return const BoxConstraints(
       minWidth: 100.0,
       maxWidth: 150.0,
       minHeight: 200.0,

packages/flutter/test/widgets/dismissable_test.dart

@@ -243,7 +243,7 @@ void main() {
 
     await tester.pumpWidget(widgetBuilder());
     Point location = tester.getTopLeft(find.text('0'));
-    Offset offset = new Offset(0.0, 5.0);
+    Offset offset = const Offset(0.0, 5.0);
     TestGesture gesture = await tester.startGesture(location, pointer: 5);
     await gesture.moveBy(offset);
     await tester.pumpWidget(widgetBuilder());
@@ -279,12 +279,12 @@ void main() {
     expect(find.text('2'), findsOneWidget);
     await dismissElement(tester, find.text('2'), gestureDirection: DismissDirection.startToEnd);
     await tester.pump(); // start the slide away
-    await tester.pump(new Duration(seconds: 1)); // finish the slide away
+    await tester.pump(const Duration(seconds: 1)); // finish the slide away
     expect(find.text('1'), findsOneWidget);
     expect(find.text('2'), findsNothing);
     await dismissElement(tester, find.text('1'), gestureDirection: DismissDirection.startToEnd);
     await tester.pump(); // start the slide away
-    await tester.pump(new Duration(seconds: 1)); // finish the slide away (at which point the child is no longer included in the tree)
+    await tester.pump(const Duration(seconds: 1)); // finish the slide away (at which point the child is no longer included in the tree)
     expect(find.text('1'), findsNothing);
     expect(find.text('2'), findsNothing);
   });

packages/flutter/test/widgets/draggable_test.dart

@@ -690,7 +690,7 @@ void main() {
     expect(onDraggableCanceledCalled, isFalse);
 
     Point flingStart = tester.getTopLeft(find.text('Source'));
-    await tester.flingFrom(flingStart, new Offset(0.0, 100.0), 1000.0);
+    await tester.flingFrom(flingStart, const Offset(0.0, 100.0), 1000.0);
     await tester.pump();
 
     expect(accepted, isEmpty);
@@ -700,7 +700,7 @@ void main() {
     expect(onDraggableCanceledCalled, isTrue);
     expect(onDraggableCanceledVelocity.pixelsPerSecond.dx.abs(), lessThan(0.0000001));
     expect((onDraggableCanceledVelocity.pixelsPerSecond.dy - 1000.0).abs(), lessThan(0.0000001));
-    expect(onDraggableCanceledOffset, equals(new Offset(flingStart.x, flingStart.y) + new Offset(0.0, 100.0)));
+    expect(onDraggableCanceledOffset, equals(new Offset(flingStart.x, flingStart.y) + const Offset(0.0, 100.0)));
   });
 
   testWidgets('Drag and drop - allow pass thru of unaccepted data test', (WidgetTester tester) async {
@@ -1007,15 +1007,15 @@ void main() {
             },
             child: new Draggable<dynamic>(
               child: new Container(
-                decoration: new BoxDecoration(
-                  backgroundColor: new Color(0xFFFFFF00)
+                decoration: const BoxDecoration(
+                  backgroundColor: const Color(0xFFFFFF00)
                 )
               ),
               feedback: new Container(
                 width: 100.0,
                 height: 100.0,
-                decoration: new BoxDecoration(
-                  backgroundColor: new Color(0xFFFF0000)
+                decoration: const BoxDecoration(
+                  backgroundColor: const Color(0xFFFF0000)
                 )
               )
             )
@@ -1042,15 +1042,15 @@ void main() {
             onTap: () { /* registers a tap recognizer */ },
             child: new Draggable<dynamic>(
               child: new Container(
-                decoration: new BoxDecoration(
-                  backgroundColor: new Color(0xFFFFFF00)
+                decoration: const BoxDecoration(
+                  backgroundColor: const Color(0xFFFFFF00)
                 )
               ),
               feedback: new Container(
                 width: 100.0,
                 height: 100.0,
-                decoration: new BoxDecoration(
-                  backgroundColor: new Color(0xFFFF0000)
+                decoration: const BoxDecoration(
+                  backgroundColor: const Color(0xFFFF0000)
                 )
               )
             )
@@ -1062,7 +1062,7 @@ void main() {
     TestGesture firstGesture = await tester.startGesture(const Point(10.0, 10.0), pointer: 24);
     TestGesture secondGesture = await tester.startGesture(const Point(10.0, 20.0), pointer: 25);
 
-    await firstGesture.moveBy(new Offset(100.0, 0.0));
+    await firstGesture.moveBy(const Offset(100.0, 0.0));
     await secondGesture.up();
   });
 

packages/flutter/test/widgets/drawer_test.dart

@@ -30,12 +30,12 @@ void main() {
     scaffoldKey.currentState.openDrawer();
     await tester.pump(); // drawer should be starting to animate in
     expect(find.text('drawer'), findsOneWidget);
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('drawer'), findsOneWidget);
     Navigator.pop(savedContext);
     await tester.pump(); // drawer should be starting to animate away
     expect(find.text('drawer'), findsOneWidget);
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('drawer'), findsNothing);
   });
 
@@ -55,19 +55,19 @@ void main() {
     scaffoldKey.currentState.openDrawer();
     await tester.pump(); // drawer should be starting to animate in
     expect(find.text('drawer'), findsOneWidget);
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('drawer'), findsOneWidget);
     await tester.tap(find.text('drawer'));
     await tester.pump(); // nothing should have happened
     expect(find.text('drawer'), findsOneWidget);
-    await tester.pump(new Duration(seconds: 1)); // ditto
+    await tester.pump(const Duration(seconds: 1)); // ditto
     expect(find.text('drawer'), findsOneWidget);
     await tester.tapAt(const Point(750.0, 100.0)); // on the mask
     await tester.pump();
-    await tester.pump(new Duration(milliseconds: 10));
+    await tester.pump(const Duration(milliseconds: 10));
     // drawer should be starting to animate away
     expect(find.text('drawer'), findsOneWidget);
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('drawer'), findsNothing);
   });
 
@@ -98,27 +98,27 @@ void main() {
     scaffoldKey.currentState.openDrawer();
     await tester.pump(); // drawer should be starting to animate in
     expect(find.text('drawer'), findsOneWidget);
-    await tester.pump(new Duration(seconds: 1)); // animation done
+    await tester.pump(const Duration(seconds: 1)); // animation done
     expect(find.text('drawer'), findsOneWidget);
 
     await tester.tapAt(const Point(750.0, 100.0)); // on the mask
     await tester.pump();
-    await tester.pump(new Duration(milliseconds: 10));
+    await tester.pump(const Duration(milliseconds: 10));
     // drawer should be starting to animate away
     RenderBox textBox = tester.renderObject(find.text('drawer'));
     double textLeft = textBox.localToGlobal(Point.origin).x;
     expect(textLeft, lessThan(0.0));
 
-    TestGesture gesture = await tester.startGesture(new Point(100.0, 100.0));
+    TestGesture gesture = await tester.startGesture(const Point(100.0, 100.0));
     // drawer should be stopped.
     await tester.pump();
-    await tester.pump(new Duration(milliseconds: 10));
+    await tester.pump(const Duration(milliseconds: 10));
     expect(textBox.localToGlobal(Point.origin).x, equals(textLeft));
 
-    await gesture.moveBy(new Offset(0.0, -50.0));
+    await gesture.moveBy(const Offset(0.0, -50.0));
     // drawer should be returning to visible
     await tester.pump();
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(textBox.localToGlobal(Point.origin).x, equals(0.0));
 
     await gesture.up();
@@ -163,10 +163,10 @@ void main() {
     expect(find.text('drawer'), findsOneWidget);
 
     // Tap the close button to pop the drawer route.
-    await tester.pump(new Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
     await tester.tap(find.text('close'));
     await tester.pump();
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(find.text('drawer'), findsNothing);
 
     // Confirm that a button in the scaffold body is still clickable.

packages/flutter/test/widgets/fitted_box_test.dart

@@ -35,8 +35,8 @@ void main() {
     expect(insideBox.size.width, 100.0);
     expect(insideBox.size.height, 50.0);
 
-    Point insidePoint = insideBox.localToGlobal(new Point(100.0, 50.0));
-    Point outsidePoint = outsideBox.localToGlobal(new Point(200.0, 100.0));
+    Point insidePoint = insideBox.localToGlobal(const Point(100.0, 50.0));
+    Point outsidePoint = outsideBox.localToGlobal(const Point(200.0, 100.0));
 
     expect(outsidePoint, equals(const Point(500.0, 350.0)));
     expect(insidePoint, equals(outsidePoint));
@@ -71,8 +71,8 @@ void main() {
     expect(insideBox.size.width, 100.0);
     expect(insideBox.size.height, 50.0);
 
-    Point insidePoint = insideBox.localToGlobal(new Point(100.0, 0.0));
-    Point outsidePoint = outsideBox.localToGlobal(new Point(200.0, 50.0));
+    Point insidePoint = insideBox.localToGlobal(const Point(100.0, 0.0));
+    Point outsidePoint = outsideBox.localToGlobal(const Point(200.0, 50.0));
 
     expect(insidePoint, equals(outsidePoint));
   });
@@ -107,8 +107,8 @@ void main() {
     expect(insideBox.size.width, 100.0);
     expect(insideBox.size.height, 50.0);
 
-    Point insidePoint = insideBox.localToGlobal(new Point(50.0, 25.0));
-    Point outsidePoint = outsideBox.localToGlobal(new Point(100.0, 100.0));
+    Point insidePoint = insideBox.localToGlobal(const Point(50.0, 25.0));
+    Point outsidePoint = outsideBox.localToGlobal(const Point(100.0, 100.0));
 
     expect(insidePoint, equals(outsidePoint));
   });

packages/flutter/test/widgets/flow_test.dart

@@ -76,14 +76,14 @@ void main() {
     expect(log, equals(<int>[0, 1, 2]));
 
     log.clear();
-    await tester.tapAt(new Point(20.0, 90.0));
+    await tester.tapAt(const Point(20.0, 90.0));
     expect(log, equals(<int>[1]));
 
     startOffset.value = 50.0;
     await tester.pump();
 
     log.clear();
-    await tester.tapAt(new Point(20.0, 90.0));
+    await tester.tapAt(const Point(20.0, 90.0));
     expect(log, equals(<int>[0]));
   });
 }

packages/flutter/test/widgets/gesture_detector_test.dart

@@ -33,14 +33,14 @@ void main() {
     expect(updatedDragDelta, isNull);
     expect(didEndDrag, isFalse);
 
-    Point firstLocation = new Point(10.0, 10.0);
+    Point firstLocation = const Point(10.0, 10.0);
     TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
     expect(didStartDrag, isTrue);
     didStartDrag = false;
     expect(updatedDragDelta, isNull);
     expect(didEndDrag, isFalse);
 
-    Point secondLocation = new Point(10.0, 9.0);
+    Point secondLocation = const Point(10.0, 9.0);
     await gesture.moveTo(secondLocation);
     expect(didStartDrag, isFalse);
     expect(updatedDragDelta, -1.0);
@@ -60,8 +60,8 @@ void main() {
     int gestureCount = 0;
     double dragDistance = 0.0;
 
-    Point downLocation = new Point(10.0, 10.0);
-    Point upLocation = new Point(10.0, 20.0);
+    Point downLocation = const Point(10.0, 10.0);
+    Point upLocation = const Point(10.0, 20.0);
 
     Widget widget = new GestureDetector(
       onVerticalDragUpdate: (DragUpdateDetails details) { dragDistance += details.primaryDelta; },
@@ -118,7 +118,7 @@ void main() {
     expect(panDelta, isNull);
     expect(didEndPan, isFalse);
 
-    await tester.scrollAt(new Point(10.0, 10.0), new Offset(20.0, 30.0));
+    await tester.scrollAt(const Point(10.0, 10.0), const Offset(20.0, 30.0));
 
     expect(didStartPan, isTrue);
     expect(panDelta.dx, 20.0);
@@ -164,28 +164,28 @@ void main() {
     didReceivePointerDown = false;
     didTap = false;
     await pumpWidgetTree(null);
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(didReceivePointerDown, isTrue);
     expect(didTap, isTrue);
 
     didReceivePointerDown = false;
     didTap = false;
     await pumpWidgetTree(HitTestBehavior.deferToChild);
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(didReceivePointerDown, isTrue);
     expect(didTap, isFalse);
 
     didReceivePointerDown = false;
     didTap = false;
     await pumpWidgetTree(HitTestBehavior.opaque);
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(didReceivePointerDown, isFalse);
     expect(didTap, isTrue);
 
     didReceivePointerDown = false;
     didTap = false;
     await pumpWidgetTree(HitTestBehavior.translucent);
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(didReceivePointerDown, isTrue);
     expect(didTap, isTrue);
 
@@ -203,7 +203,7 @@ void main() {
       )
     );
     expect(didTap, isFalse);
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(didTap, isTrue);
   });
 
@@ -220,7 +220,7 @@ void main() {
       )
     );
     expect(didTap, isFalse);
-    await tester.tapAt(new Point(10.0, 10.0));
+    await tester.tapAt(const Point(10.0, 10.0));
     expect(didTap, isFalse);
   });
 }

packages/flutter/test/widgets/heroes_test.dart

@@ -91,7 +91,7 @@ void main() {
     expect(find.byKey(secondKey), isOnstage);
     expect(find.byKey(secondKey), isNotInCard);
 
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
 
     // t=1.032s for the journey. The journey has ended (it ends this frame, in
     // fact). The hero should now be in the new page, onstage. The original
@@ -139,7 +139,7 @@ void main() {
     expect(find.byKey(thirdKey), isOnstage);
     expect(find.byKey(thirdKey), isNotInCard);
 
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
 
     // t=1.032s for the journey. The journey has ended (it ends this frame, in
     // fact). The hero should now be in the new page, onstage.
@@ -170,12 +170,12 @@ void main() {
     ));
 
     await tester.tap(find.text('two'));
-    await tester.pump(new Duration(milliseconds: 10));
+    await tester.pump(const Duration(milliseconds: 10));
 
     route.markNeedsBuild();
 
-    await tester.pump(new Duration(milliseconds: 10));
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(milliseconds: 10));
+    await tester.pump(const Duration(seconds: 1));
   });
 
   testWidgets('Heroes animation is fastOutSlowIn', (WidgetTester tester) async {
@@ -271,18 +271,18 @@ void main() {
     await tester.tap(find.text('foo', skipOffstage: false));
     expect(log, isEmpty);
 
-    await tester.pump(new Duration(milliseconds: 10));
+    await tester.pump(const Duration(milliseconds: 10));
     await tester.tap(find.text('foo', skipOffstage: false));
     expect(log, isEmpty);
     await tester.tap(find.text('bar', skipOffstage: false));
     expect(log, isEmpty);
 
-    await tester.pump(new Duration(milliseconds: 10));
+    await tester.pump(const Duration(milliseconds: 10));
     expect(find.text('foo'), findsNothing);
     await tester.tap(find.text('bar', skipOffstage: false));
     expect(log, isEmpty);
 
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(find.text('foo'), findsNothing);
     await tester.tap(find.text('bar'));
     expect(log, equals(<String>['bar']));

packages/flutter/test/widgets/hyperlink_test.dart

@@ -32,7 +32,7 @@ void main() {
                 text: 'xxxxxxxx',
                 recognizer: tapLeft
               ),
-              new TextSpan(text: 'yyyyyyyy'),
+              const TextSpan(text: 'yyyyyyyy'),
               new TextSpan(
                 text: 'zzzzzzzzz',
                 recognizer: tapRight
@@ -48,21 +48,21 @@ void main() {
     expect(didTapLeft, isFalse);
     expect(didTapRight, isFalse);
 
-    await tester.tapAt(box.localToGlobal(Point.origin) + new Offset(2.0, 2.0));
+    await tester.tapAt(box.localToGlobal(Point.origin) + const Offset(2.0, 2.0));
 
     expect(didTapLeft, isTrue);
     expect(didTapRight, isFalse);
 
     didTapLeft = false;
 
-    await tester.tapAt(box.localToGlobal(Point.origin) + new Offset(30.0, 2.0));
+    await tester.tapAt(box.localToGlobal(Point.origin) + const Offset(30.0, 2.0));
 
     expect(didTapLeft, isTrue);
     expect(didTapRight, isFalse);
 
     didTapLeft = false;
 
-    await tester.tapAt(box.localToGlobal(new Point(box.size.width, 0.0)) + new Offset(-2.0, 2.0));
+    await tester.tapAt(box.localToGlobal(new Point(box.size.width, 0.0)) + const Offset(-2.0, 2.0));
 
     expect(didTapLeft, isFalse);
     expect(didTapRight, isTrue);

packages/flutter/test/widgets/image_test.dart

@@ -175,13 +175,13 @@ void main() {
     await tester.pumpWidget(
       new MediaQuery(
         key: mediaQueryKey1,
-        data: new MediaQueryData(
+        data: const MediaQueryData(
           devicePixelRatio: 10.0,
           padding: EdgeInsets.zero,
         ),
         child: new MediaQuery(
           key: mediaQueryKey2,
-          data: new MediaQueryData(
+          data: const MediaQueryData(
             devicePixelRatio: 5.0,
             padding: EdgeInsets.zero,
           ),
@@ -201,13 +201,13 @@ void main() {
     await tester.pumpWidget(
       new MediaQuery(
         key: mediaQueryKey2,
-        data: new MediaQueryData(
+        data: const MediaQueryData(
           devicePixelRatio: 5.0,
           padding: EdgeInsets.zero,
         ),
         child: new MediaQuery(
           key: mediaQueryKey1,
-          data: new MediaQueryData(
+          data: const MediaQueryData(
             devicePixelRatio: 10.0,
             padding: EdgeInsets.zero,
           ),
@@ -235,7 +235,7 @@ void main() {
         children: <Widget> [
           new MediaQuery(
             key: mediaQueryKey2,
-            data: new MediaQueryData(
+            data: const MediaQueryData(
               devicePixelRatio: 5.0,
               padding: EdgeInsets.zero,
             ),
@@ -246,7 +246,7 @@ void main() {
           ),
           new MediaQuery(
             key: mediaQueryKey1,
-            data: new MediaQueryData(
+            data: const MediaQueryData(
               devicePixelRatio: 10.0,
               padding: EdgeInsets.zero,
             ),
@@ -263,7 +263,7 @@ void main() {
         children: <Widget> [
           new MediaQuery(
             key: mediaQueryKey2,
-            data: new MediaQueryData(
+            data: const MediaQueryData(
               devicePixelRatio: 5.0,
               padding: EdgeInsets.zero,
             ),
@@ -271,7 +271,7 @@ void main() {
           ),
           new MediaQuery(
             key: mediaQueryKey1,
-            data: new MediaQueryData(
+            data: const MediaQueryData(
               devicePixelRatio: 10.0,
               padding: EdgeInsets.zero,
             ),

packages/flutter/test/widgets/implicit_animations_test.dart

@@ -8,8 +8,8 @@ import 'package:flutter/widgets.dart';
 void main() {
   testWidgets('BoxConstraintsTween control test', (WidgetTester tester) async {
     BoxConstraintsTween tween = new BoxConstraintsTween(
-      begin: new BoxConstraints.tight(new Size(20.0, 50.0)),
-      end: new BoxConstraints.tight(new Size(10.0, 30.0))
+      begin: new BoxConstraints.tight(const Size(20.0, 50.0)),
+      end: new BoxConstraints.tight(const Size(10.0, 30.0))
     );
     BoxConstraints result = tween.lerp(0.25);
     expect(result.minWidth, 17.5);
@@ -20,17 +20,17 @@ void main() {
 
   testWidgets('DecorationTween control test', (WidgetTester tester) async {
     DecorationTween tween = new DecorationTween(
-      begin: new BoxDecoration(backgroundColor: new Color(0xFF00FF00)),
-      end: new BoxDecoration(backgroundColor: new Color(0xFFFFFF00))
+      begin: const BoxDecoration(backgroundColor: const Color(0xFF00FF00)),
+      end: const BoxDecoration(backgroundColor: const Color(0xFFFFFF00))
     );
     BoxDecoration result = tween.lerp(0.25);
-    expect(result.backgroundColor, new Color(0xFF3FFF00));
+    expect(result.backgroundColor, const Color(0xFF3FFF00));
   });
 
   testWidgets('EdgeInsetsTween control test', (WidgetTester tester) async {
     EdgeInsetsTween tween = new EdgeInsetsTween(
-      begin: new EdgeInsets.symmetric(vertical: 50.0),
-      end: new EdgeInsets.only(top: 10.0, bottom: 30.0)
+      begin: const EdgeInsets.symmetric(vertical: 50.0),
+      end: const EdgeInsets.only(top: 10.0, bottom: 30.0)
     );
     EdgeInsets result = tween.lerp(0.25);
     expect(result.left, 0.0);

packages/flutter/test/widgets/independent_widget_layout_test.dart

@@ -9,7 +9,7 @@ import 'package:flutter/rendering.dart';
 const Size _kTestViewSize = const Size(800.0, 600.0);
 
 class OffscreenRenderView extends RenderView {
-  OffscreenRenderView() : super(configuration: new ViewConfiguration(size: _kTestViewSize));
+  OffscreenRenderView() : super(configuration: const ViewConfiguration(size: _kTestViewSize));
 
   @override
   void compositeFrame() {

packages/flutter/test/widgets/input_test.dart

@@ -80,7 +80,7 @@ void main() {
     List<TextSelectionPoint> endpoints = renderEditable.getEndpointsForSelection(
         new TextSelection.collapsed(offset: offset));
     expect(endpoints.length, 1);
-    return endpoints[0].point + new Offset(0.0, -2.0);
+    return endpoints[0].point + const Offset(0.0, -2.0);
   }
 
   testWidgets('Editable text has consistent size', (WidgetTester tester) async {
@@ -164,7 +164,7 @@ void main() {
     await checkCursorToggle();
 
     // Try the test again with a nonempty EditableText.
-    updateEditingState(new TextEditingState(
+    updateEditingState(const TextEditingState(
       text: 'X',
       selectionBase: 1,
       selectionExtent: 1,
@@ -191,7 +191,7 @@ void main() {
     await showKeyboard(tester);
 
     const String testValue = 'ABC';
-    updateEditingState(new TextEditingState(
+    updateEditingState(const TextEditingState(
       text: testValue,
       selectionBase: testValue.length,
       selectionExtent: testValue.length,
@@ -298,7 +298,7 @@ void main() {
     // Drag the right handle 2 letters to the right.
     // Note: use a small offset because the endpoint is on the very corner
     // of the handle.
-    Point handlePos = endpoints[1].point + new Offset(1.0, 1.0);
+    Point handlePos = endpoints[1].point + const Offset(1.0, 1.0);
     Point newHandlePos = textOffsetToPosition(tester, selection.extentOffset+2);
     gesture = await tester.startGesture(handlePos, pointer: 7);
     await tester.pump();
@@ -311,7 +311,7 @@ void main() {
     expect(inputValue.selection.extentOffset, selection.extentOffset+2);
 
     // Drag the left handle 2 letters to the left.
-    handlePos = endpoints[0].point + new Offset(-1.0, 1.0);
+    handlePos = endpoints[0].point + const Offset(-1.0, 1.0);
     newHandlePos = textOffsetToPosition(tester, selection.baseOffset-2);
     gesture = await tester.startGesture(handlePos, pointer: 7);
     await tester.pump();
@@ -362,7 +362,7 @@ void main() {
     RenderEditable renderEditable = findRenderEditable(tester);
     List<TextSelectionPoint> endpoints = renderEditable.getEndpointsForSelection(
         inputValue.selection);
-    await tester.tapAt(endpoints[0].point + new Offset(1.0, 1.0));
+    await tester.tapAt(endpoints[0].point + const Offset(1.0, 1.0));
     await tester.pumpWidget(builder());
 
     // SELECT ALL should select all the text.
@@ -381,7 +381,7 @@ void main() {
     await tester.pumpWidget(builder());
     renderEditable = findRenderEditable(tester);
     endpoints = renderEditable.getEndpointsForSelection(inputValue.selection);
-    await tester.tapAt(endpoints[0].point + new Offset(1.0, 1.0));
+    await tester.tapAt(endpoints[0].point + const Offset(1.0, 1.0));
     await tester.pumpWidget(builder());
 
     // PASTE right before the 'e'.
@@ -428,7 +428,7 @@ void main() {
     RenderEditable renderEditable = findRenderEditable(tester);
     List<TextSelectionPoint> endpoints = renderEditable.getEndpointsForSelection(
         inputValue.selection);
-    await tester.tapAt(endpoints[0].point + new Offset(1.0, 1.0));
+    await tester.tapAt(endpoints[0].point + const Offset(1.0, 1.0));
     await tester.pumpWidget(builder());
 
     // Toolbar should fade in. Starting at 0% opacity.
@@ -563,7 +563,7 @@ void main() {
     expect(endpoints.length, 2);
 
     // Drag the right handle to the third line, just after 'Third'.
-    Point handlePos = endpoints[1].point + new Offset(1.0, 1.0);
+    Point handlePos = endpoints[1].point + const Offset(1.0, 1.0);
     Point newHandlePos = textOffsetToPosition(tester, testValue.indexOf('Third') + 5);
     gesture = await tester.startGesture(handlePos, pointer: 7);
     await tester.pump();
@@ -576,7 +576,7 @@ void main() {
     expect(inputValue.selection.extentOffset, 108);
 
     // Drag the left handle to the first line, just after 'First'.
-    handlePos = endpoints[0].point + new Offset(-1.0, 1.0);
+    handlePos = endpoints[0].point + const Offset(-1.0, 1.0);
     newHandlePos = textOffsetToPosition(tester, testValue.indexOf('First') + 5);
     gesture = await tester.startGesture(handlePos, pointer: 7);
     await tester.pump();
@@ -642,11 +642,11 @@ void main() {
 
     TestGesture gesture = await tester.startGesture(firstPos, pointer: 7);
     await tester.pump();
-    await gesture.moveBy(new Offset(0.0, -1000.0));
+    await gesture.moveBy(const Offset(0.0, -1000.0));
     await tester.pump(const Duration(seconds: 2));
     // Wait and drag again to trigger https://github.com/flutter/flutter/issues/6329
     // (No idea why this is necessary, but the bug wouldn't repro without it.)
-    await gesture.moveBy(new Offset(0.0, -1000.0));
+    await gesture.moveBy(const Offset(0.0, -1000.0));
     await tester.pump(const Duration(seconds: 2));
     await gesture.up();
     await tester.pump();
@@ -674,11 +674,11 @@ void main() {
     expect(endpoints.length, 2);
 
     // Drag the left handle to the first line, just after 'First'.
-    Point handlePos = endpoints[0].point + new Offset(-1.0, 1.0);
+    Point handlePos = endpoints[0].point + const Offset(-1.0, 1.0);
     Point newHandlePos = textOffsetToPosition(tester, kFourLines.indexOf('First') + 5);
     gesture = await tester.startGesture(handlePos, pointer: 7);
     await tester.pump();
-    await gesture.moveTo(newHandlePos + new Offset(0.0, -10.0));
+    await gesture.moveTo(newHandlePos + const Offset(0.0, -10.0));
     await tester.pump();
     await gesture.up();
     await tester.pump();

packages/flutter/test/widgets/layout_builder_mutations_test.dart

@@ -28,7 +28,7 @@ void main() {
     await tester.pumpWidget(new Row(children: <Widget>[
       new Wrapper(
         child: new LayoutBuilder(builder: (BuildContext context, BoxConstraints constraints) {
-          return new SizedBox();
+          return const SizedBox();
         }),
       ),
       new Wrapper(
@@ -53,7 +53,7 @@ void main() {
       new Wrapper(
         child: new Wrapper(
           child: new LayoutBuilder(builder: (BuildContext context, BoxConstraints constraints) {
-            return new SizedBox();
+            return const SizedBox();
           })
         )
       ),

packages/flutter/test/widgets/layout_builder_test.dart

@@ -140,13 +140,13 @@ void main() {
     expect(built, 0);
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(size: const Size(400.0, 300.0)),
+      data: const MediaQueryData(size: const Size(400.0, 300.0)),
       child: target
     ));
     expect(built, 1);
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(size: const Size(300.0, 400.0)),
+      data: const MediaQueryData(size: const Size(300.0, 400.0)),
       child: target
     ));
     expect(built, 1);
@@ -164,13 +164,13 @@ void main() {
     expect(built, 0);
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(size: const Size(400.0, 300.0)),
+      data: const MediaQueryData(size: const Size(400.0, 300.0)),
       child: target
     ));
     expect(built, 1);
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(size: const Size(300.0, 400.0)),
+      data: const MediaQueryData(size: const Size(300.0, 400.0)),
       child: target
     ));
     expect(built, 2);

packages/flutter/test/widgets/lazy_block_viewport_test.dart

@@ -255,14 +255,14 @@ void main() {
 
     await tester.pumpWidget(
       new LazyBlockViewport(
-        padding: new EdgeInsets.fromLTRB(7.0, 3.0, 5.0, 11.0),
+        padding: const EdgeInsets.fromLTRB(7.0, 3.0, 5.0, 11.0),
         delegate: new LazyBlockBuilder(builder: itemBuilder)
       )
     );
 
     RenderBox firstBox = tester.renderObject(find.text('0'));
     Point upperLeft = firstBox.localToGlobal(Point.origin);
-    expect(upperLeft, equals(new Point(7.0, 3.0)));
+    expect(upperLeft, equals(const Point(7.0, 3.0)));
     expect(firstBox.size.width, equals(800.0 - 12.0));
   });
 

packages/flutter/test/widgets/navigator_test.dart

@@ -13,8 +13,8 @@ class FirstWidget extends StatelessWidget {
         Navigator.pushNamed(context, '/second');
       },
       child: new Container(
-        decoration: new BoxDecoration(
-          backgroundColor: new Color(0xFFFFFF00)
+        decoration: const BoxDecoration(
+          backgroundColor: const Color(0xFFFFFF00)
         ),
         child: new Text('X')
       )
@@ -33,8 +33,8 @@ class SecondWidgetState extends State<SecondWidget> {
     return new GestureDetector(
       onTap: () => Navigator.pop(context),
       child: new Container(
-        decoration: new BoxDecoration(
-          backgroundColor: new Color(0xFFFF00FF)
+        decoration: const BoxDecoration(
+          backgroundColor: const Color(0xFFFF00FF)
         ),
         child: new Text('Y')
       )
@@ -127,7 +127,7 @@ void main() {
     );
     await tester.pumpWidget(widget);
     await tester.tap(find.byKey(targetKey));
-    expect(exception, new isInstanceOf<FlutterError>());
+    expect(exception, const isInstanceOf<FlutterError>());
     expect('$exception', startsWith('Navigator operation requested with a context'));
   });
 

packages/flutter/test/widgets/page_transitions_test.dart

@@ -149,8 +149,8 @@ void main() {
     expect(find.text('Settings'), isOnstage);
 
     // Drag from left edge to invoke the gesture.
-    TestGesture gesture = await tester.startGesture(new Point(5.0, 100.0));
-    await gesture.moveBy(new Offset(50.0, 0.0));
+    TestGesture gesture = await tester.startGesture(const Point(5.0, 100.0));
+    await gesture.moveBy(const Offset(50.0, 0.0));
     await tester.pump();
 
     // Home is now visible.
@@ -180,8 +180,8 @@ void main() {
     expect(find.text('Settings'), isOnstage);
 
     // Drag from left edge to invoke the gesture.
-    TestGesture gesture = await tester.startGesture(new Point(5.0, 100.0));
-    await gesture.moveBy(new Offset(50.0, 0.0));
+    TestGesture gesture = await tester.startGesture(const Point(5.0, 100.0));
+    await gesture.moveBy(const Offset(50.0, 0.0));
     await tester.pump();
 
     expect(find.text('Home'), findsNothing);
@@ -255,7 +255,7 @@ void main() {
       '/': (_) => new Scaffold(
         key: containerKey1,
         body: new Container(
-          decoration: new BoxDecoration(backgroundColor: const Color(0xff00ffff)),
+          decoration: const BoxDecoration(backgroundColor: const Color(0xff00ffff)),
           child: new Hero(
             tag: kHeroTag,
             child: new Text('Home')
@@ -266,7 +266,7 @@ void main() {
         key: containerKey2,
         body: new Container(
           padding: const EdgeInsets.all(100.0),
-          decoration: new BoxDecoration(backgroundColor: const Color(0xffff00ff)),
+          decoration: const BoxDecoration(backgroundColor: const Color(0xffff00ff)),
           child: new Hero(
             tag: kHeroTag,
             child: new Text('Settings')
@@ -300,8 +300,8 @@ void main() {
     expect(find.text('Settings'), isOnstage);
 
     // Drag from left edge to invoke the gesture.
-    TestGesture gesture = await tester.startGesture(new Point(5.0, 100.0));
-    await gesture.moveBy(new Offset(50.0, 0.0));
+    TestGesture gesture = await tester.startGesture(const Point(5.0, 100.0));
+    await gesture.moveBy(const Offset(50.0, 0.0));
     await tester.pump();
 
     // Home is now visible.
@@ -343,8 +343,8 @@ void main() {
 
     // Drag from left edge to invoke the gesture. (near bottom so we grab
     // the Settings page as it comes up).
-    TestGesture gesture = await tester.startGesture(new Point(5.0, 550.0));
-    await gesture.moveBy(new Offset(500.0, 0.0));
+    TestGesture gesture = await tester.startGesture(const Point(5.0, 550.0));
+    await gesture.moveBy(const Offset(500.0, 0.0));
     await gesture.up();
     await tester.pump();
     await tester.pump(const Duration(milliseconds: 1000));
@@ -355,8 +355,8 @@ void main() {
     expect(find.text('Settings'), isOnstage);
 
     // Try again now that we're settled.
-    gesture = await tester.startGesture(new Point(5.0, 550.0));
-    await gesture.moveBy(new Offset(500.0, 0.0));
+    gesture = await tester.startGesture(const Point(5.0, 550.0));
+    await gesture.moveBy(const Offset(500.0, 0.0));
     await gesture.up();
     await tester.pump();
     await tester.pump(const Duration(milliseconds: 1000));
@@ -394,8 +394,8 @@ void main() {
     await tester.pump(const Duration(seconds: 1));
 
     // Drag from left edge to invoke the gesture.
-    TestGesture gesture = await tester.startGesture(new Point(5.0, 100.0));
-    await gesture.moveBy(new Offset(500.0, 0.0));
+    TestGesture gesture = await tester.startGesture(const Point(5.0, 100.0));
+    await gesture.moveBy(const Offset(500.0, 0.0));
     await gesture.up();
     await tester.pump();
     await tester.pump(const Duration(seconds: 1));
@@ -416,7 +416,7 @@ void main() {
     await tester.pumpWidget(new MaterialApp(routes: routes));
 
     PageRoute<Null> route = new MaterialPageRoute<Null>(
-      settings: new RouteSettings(name: '/page'),
+      settings: const RouteSettings(name: '/page'),
       builder: (BuildContext context) => new Center(child: new Text('page')),
     );
 

packages/flutter/test/widgets/pageable_list_test.dart

@@ -6,7 +6,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
-Size pageSize = new Size(600.0, 300.0);
+Size pageSize = const Size(600.0, 300.0);
 const List<int> defaultPages = const <int>[0, 1, 2, 3, 4, 5];
 final List<GlobalKey> globalKeys = defaultPages.map((_) => new GlobalKey()).toList();
 int currentPage;

packages/flutter/test/widgets/remember_scroll_position_test.dart

@@ -62,7 +62,7 @@ Future<Null> performTest(WidgetTester tester, bool maintainState) async {
   Completer<Null> completer = new Completer<Null>();
   tester.state/*<ScrollableState>*/(find.byType(Scrollable)).scrollTo(1000.0).whenComplete(completer.complete);
   expect(completer.isCompleted, isFalse);
-  await tester.pump(new Duration(seconds: 1));
+  await tester.pump(const Duration(seconds: 1));
   expect(completer.isCompleted, isTrue);
 
   // we're 600 pixels high, each item is 100 pixels high, scroll position is
@@ -82,7 +82,7 @@ Future<Null> performTest(WidgetTester tester, bool maintainState) async {
 
   navigatorKey.currentState.pushNamed('/second');
   await tester.pump(); // navigating always takes two frames, one to start...
-  await tester.pump(new Duration(seconds: 1)); // ...and one to end the transition
+  await tester.pump(const Duration(seconds: 1)); // ...and one to end the transition
 
   // the second list is now visible, starting at 10000
   expect(find.text('10000'), findsOneWidget);
@@ -103,7 +103,7 @@ Future<Null> performTest(WidgetTester tester, bool maintainState) async {
   LazyListViewport viewport = tester.firstWidget(find.byType(LazyListViewport));
   expect(viewport.scrollOffset, equals(1000.0));
 
-  await tester.pump(new Duration(seconds: 1));
+  await tester.pump(const Duration(seconds: 1));
 
   // we're 600 pixels high, each item is 100 pixels high, scroll position is
   // 1000, so we should have exactly 6 items, 10..15.

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();
-final BoxDecoration kBoxDecorationB = new BoxDecoration();
-final BoxDecoration kBoxDecorationC = new BoxDecoration();
+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
 
 class TestWidget extends StatelessWidget {
   const TestWidget({ this.child });
@@ -26,9 +26,9 @@ class TestOrientedBox extends SingleChildRenderObjectWidget {
     Orientation orientation = MediaQuery.of(context).orientation;
     switch (orientation) {
       case Orientation.landscape:
-        return new BoxDecoration(backgroundColor: const Color(0xFF00FF00));
+        return const BoxDecoration(backgroundColor: const Color(0xFF00FF00));
       case Orientation.portrait:
-        return new BoxDecoration(backgroundColor: const Color(0xFF0000FF));
+        return const BoxDecoration(backgroundColor: const Color(0xFF0000FF));
     }
     assert(orientation != null);
     return null;
@@ -194,20 +194,20 @@ void main() {
     TestOrientedBox box = new TestOrientedBox(key: boxKey);
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(size: const Size(400.0, 300.0)),
+      data: const MediaQueryData(size: const Size(400.0, 300.0)),
       child: box
     ));
 
     RenderDecoratedBox renderBox = tester.renderObject(find.byKey(boxKey));
     BoxDecoration decoration = renderBox.decoration;
-    expect(decoration.backgroundColor, equals(new Color(0xFF00FF00)));
+    expect(decoration.backgroundColor, equals(const Color(0xFF00FF00)));
 
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(size: const Size(300.0, 400.0)),
+      data: const MediaQueryData(size: const Size(300.0, 400.0)),
       child: box
     ));
 
     decoration = renderBox.decoration;
-    expect(decoration.backgroundColor, equals(new Color(0xFF0000FF)));
+    expect(decoration.backgroundColor, equals(const Color(0xFF0000FF)));
   });
 }

packages/flutter/test/widgets/rotated_box_test.dart

@@ -44,11 +44,11 @@ void main() {
     expect(box.size.width, equals(65.0));
     expect(box.size.height, equals(175.0));
 
-    await tester.tapAt(new Point(420.0, 280.0));
+    await tester.tapAt(const Point(420.0, 280.0));
     expect(log, equals(<String>['left']));
     log.clear();
 
-    await tester.tapAt(new Point(380.0, 320.0));
+    await tester.tapAt(const Point(380.0, 320.0));
     expect(log, equals(<String>['right']));
     log.clear();
   });

packages/flutter/test/widgets/scroll_behavior_test.dart

@@ -80,7 +80,7 @@ void main() {
 
     expect(delegate, isNotNull);
     expect(delegate.flag, isTrue);
-    expect(behavior, new isInstanceOf<BoundedBehavior>());
+    expect(behavior, const isInstanceOf<BoundedBehavior>());
     expect(behavior.contentExtent, equals(1000.0));
     expect(behavior.containerExtent, equals(600.0));
 
@@ -103,7 +103,7 @@ void main() {
 
     expect(delegate, isNotNull);
     expect(delegate.flag, isFalse);
-    expect(behavior, new isInstanceOf<UnboundedBehavior>());
+    expect(behavior, const isInstanceOf<UnboundedBehavior>());
     // Regression test for https://github.com/flutter/flutter/issues/5856
     expect(behavior.contentExtent, equals(1000.0));
     expect(behavior.containerExtent, equals(600.0));

packages/flutter/test/widgets/scroll_events_test.dart

@@ -37,11 +37,11 @@ void main() {
     await tester.pumpWidget(_buildScroller(log: log));
 
     expect(log, equals(<String>[]));
-    TestGesture gesture = await tester.startGesture(new Point(100.0, 100.0));
+    TestGesture gesture = await tester.startGesture(const Point(100.0, 100.0));
     expect(log, equals(<String>['scrollstart']));
     await tester.pump(const Duration(seconds: 1));
     expect(log, equals(<String>['scrollstart']));
-    await gesture.moveBy(new Offset(-10.0, -10.0));
+    await gesture.moveBy(const Offset(-10.0, -10.0));
     expect(log, equals(<String>['scrollstart', 'scroll']));
     await tester.pump(const Duration(seconds: 1));
     expect(log, equals(<String>['scrollstart', 'scroll']));
@@ -138,15 +138,15 @@ void main() {
     await tester.pumpWidget(_buildScroller(key: scrollKey, log: log));
 
     expect(log, equals(<String>[]));
-    await tester.flingFrom(new Point(100.0, 100.0), new Offset(-50.0, -50.0), 500.0);
-    await tester.pump(new Duration(seconds: 1));
+    await tester.flingFrom(const Point(100.0, 100.0), const Offset(-50.0, -50.0), 500.0);
+    await tester.pump(const Duration(seconds: 1));
     log.removeWhere((String value) => value == 'scroll');
     expect(log, equals(<String>['scrollstart']));
-    await tester.flingFrom(new Point(100.0, 100.0), new Offset(-50.0, -50.0), 500.0);
+    await tester.flingFrom(const Point(100.0, 100.0), const Offset(-50.0, -50.0), 500.0);
     log.removeWhere((String value) => value == 'scroll');
     expect(log, equals(<String>['scrollstart', 'scrollend', 'scrollstart']));
-    await tester.pump(new Duration(seconds: 1));
-    await tester.pump(new Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     log.removeWhere((String value) => value == 'scroll');
     expect(log, equals(<String>['scrollstart', 'scrollend', 'scrollstart', 'scrollend']));
   });
@@ -157,10 +157,10 @@ void main() {
     await tester.pumpWidget(_buildScroller(key: scrollKey, log: log));
 
     expect(log, equals(<String>[]));
-    await tester.flingFrom(new Point(100.0, 100.0), new Offset(50.0, 50.0), 500.0);
-    await tester.pump(new Duration(seconds: 1));
-    await tester.pump(new Duration(seconds: 1));
-    await tester.pump(new Duration(seconds: 1));
+    await tester.flingFrom(const Point(100.0, 100.0), const Offset(50.0, 50.0), 500.0);
+    await tester.pump(const Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
     expect(log.first, equals('scrollstart'));
     expect(log.last, equals('scrollend'));
     log.removeWhere((String value) => value == 'scroll');

packages/flutter/test/widgets/scroll_interaction_test.dart

@@ -18,7 +18,7 @@ void main() {
 
     expect(scrollable.scrollOffset, equals(0.0));
 
-    await tester.flingFrom(new Point(200.0, 300.0), new Offset(0.0, -200.0), 500.0);
+    await tester.flingFrom(const Point(200.0, 300.0), const Offset(0.0, -200.0), 500.0);
     await tester.pump();
     await tester.pump(const Duration(seconds: 5));
 
@@ -26,7 +26,7 @@ void main() {
 
     double oldOffset = scrollable.scrollOffset;
 
-    await tester.flingFrom(new Point(200.0, 300.0), new Offset(0.0, -200.0), 500.0);
+    await tester.flingFrom(const Point(200.0, 300.0), const Offset(0.0, -200.0), 500.0);
     await tester.pump();
     await tester.pump(const Duration(seconds: 5));
 

packages/flutter/test/widgets/scroll_notification_test.dart

@@ -15,27 +15,27 @@ void main() {
         return false;
       },
       child: new ScrollableViewport(
-        child: new SizedBox(height: 1200.0)
+        child: const SizedBox(height: 1200.0)
       )
     ));
 
-    TestGesture gesture = await tester.startGesture(new Point(100.0, 100.0));
+    TestGesture gesture = await tester.startGesture(const Point(100.0, 100.0));
     await tester.pump(const Duration(seconds: 1));
     expect(notification.kind, equals(ScrollNotificationKind.started));
     expect(notification.depth, equals(0));
     expect(notification.dragStartDetails, isNotNull);
-    expect(notification.dragStartDetails.globalPosition, equals(new Point(100.0, 100.0)));
+    expect(notification.dragStartDetails.globalPosition, equals(const Point(100.0, 100.0)));
     expect(notification.dragUpdateDetails, isNull);
     expect(notification.dragEndDetails, isNull);
 
-    await gesture.moveBy(new Offset(-10.0, -10.0));
+    await gesture.moveBy(const Offset(-10.0, -10.0));
     await tester.pump(const Duration(seconds: 1));
     expect(notification.kind, equals(ScrollNotificationKind.updated));
     expect(notification.depth, equals(0));
     expect(notification.dragStartDetails, isNull);
     expect(notification.dragUpdateDetails, isNotNull);
-    expect(notification.dragUpdateDetails.globalPosition, equals(new Point(90.0, 90.0)));
-    expect(notification.dragUpdateDetails.delta, equals(new Offset(0.0, -10.0)));
+    expect(notification.dragUpdateDetails.globalPosition, equals(const Point(90.0, 90.0)));
+    expect(notification.dragUpdateDetails.delta, equals(const Offset(0.0, -10.0)));
     expect(notification.dragEndDetails, isNull);
 
     await gesture.up();
@@ -71,16 +71,16 @@ void main() {
             },
             child: new Container(
               padding: const EdgeInsets.all(50.0),
-              child: new ScrollableViewport(child: new SizedBox(height: 1200.0))
+              child: new ScrollableViewport(child: const SizedBox(height: 1200.0))
             )
           )
         )
       )
     ));
 
-    TestGesture gesture = await tester.startGesture(new Point(100.0, 100.0));
+    TestGesture gesture = await tester.startGesture(const Point(100.0, 100.0));
     await tester.pump(const Duration(seconds: 1));
-    await gesture.moveBy(new Offset(-10.0, -10.0));
+    await gesture.moveBy(const Offset(-10.0, -10.0));
     await tester.pump(const Duration(seconds: 1));
     await gesture.up();
     await tester.pump(const Duration(seconds: 1));

packages/flutter/test/widgets/scrollable_dispose_test.dart

@@ -17,10 +17,10 @@ void main() {
       right: new Container()
     ));
 
-    await tester.fling(find.byType(Scrollable), new Offset(0.0, -200.0), 1000.0);
+    await tester.fling(find.byType(Scrollable), const Offset(0.0, -200.0), 1000.0);
     await tester.pump();
 
     tester.state/*<FlipWidgetState>*/(find.byType(FlipWidget)).flip();
-    await tester.pump(new Duration(hours: 5));
+    await tester.pump(const Duration(hours: 5));
   });
 }

packages/flutter/test/widgets/scrollable_fling_test.dart

@@ -73,7 +73,7 @@ void main() {
     await tester.tap(find.byType(Scrollable));
     await tester.pump(const Duration(milliseconds: 50));
     expect(log, equals(<String>['tap 18']));
-    await tester.fling(find.byType(Scrollable), new Offset(0.0, -200.0), 1000.0);
+    await tester.fling(find.byType(Scrollable), const Offset(0.0, -200.0), 1000.0);
     await tester.pump(const Duration(milliseconds: 50));
     expect(log, equals(<String>['tap 18']));
     await tester.tap(find.byType(Scrollable));
@@ -96,7 +96,7 @@ void main() {
     await tester.tap(find.byType(Scrollable));
     await tester.pump(const Duration(milliseconds: 50));
     expect(log, equals(<String>['tap 18']));
-    await tester.fling(find.byType(Scrollable), new Offset(0.0, -200.0), 1000.0);
+    await tester.fling(find.byType(Scrollable), const Offset(0.0, -200.0), 1000.0);
     await tester.pump(const Duration(milliseconds: 50));
     expect(log, equals(<String>['tap 18']));
     await tester.pump(const Duration(seconds: 50));

packages/flutter/test/widgets/scrollable_grid_test.dart

@@ -16,7 +16,7 @@ void main() {
   // Tests https://github.com/flutter/flutter/issues/5522
   testWidgets('ScrollableGrid displays correct children with nonzero padding', (WidgetTester tester) async {
     GlobalKey<ScrollableState> scrollableKey = new GlobalKey<ScrollableState>();
-    final EdgeInsets padding = new EdgeInsets.fromLTRB(0.0, 100.0, 0.0, 0.0);
+    final EdgeInsets padding = const EdgeInsets.fromLTRB(0.0, 100.0, 0.0, 0.0);
 
     Widget testWidget = new Align(
       child: new SizedBox(

packages/flutter/test/widgets/scrollable_list_hit_testing_test.dart

@@ -94,7 +94,7 @@ void main() {
       new ScrollableList(
         key: new GlobalKey(),
         itemExtent: 290.0,
-        padding: new EdgeInsets.fromLTRB(5.0, 20.0, 15.0, 10.0),
+        padding: const EdgeInsets.fromLTRB(5.0, 20.0, 15.0, 10.0),
         children: items.map((int item) {
           return new Container(
             child: new GestureDetector(
@@ -105,17 +105,17 @@ void main() {
         })
       )
     );
-    await tester.tapAt(new Point(200.0, 19.0));
+    await tester.tapAt(const Point(200.0, 19.0));
     expect(tapped, equals(<int>[]));
-    await tester.tapAt(new Point(200.0, 21.0));
+    await tester.tapAt(const Point(200.0, 21.0));
     expect(tapped, equals(<int>[0]));
-    await tester.tapAt(new Point(4.0, 400.0));
+    await tester.tapAt(const Point(4.0, 400.0));
     expect(tapped, equals(<int>[0]));
-    await tester.tapAt(new Point(6.0, 400.0));
+    await tester.tapAt(const Point(6.0, 400.0));
     expect(tapped, equals(<int>[0, 1]));
-    await tester.tapAt(new Point(800.0 - 14.0, 400.0));
+    await tester.tapAt(const Point(800.0 - 14.0, 400.0));
     expect(tapped, equals(<int>[0, 1]));
-    await tester.tapAt(new Point(800.0 - 16.0, 400.0));
+    await tester.tapAt(const Point(800.0 - 16.0, 400.0));
     expect(tapped, equals(<int>[0, 1, 1]));
   });
 
@@ -127,7 +127,7 @@ void main() {
         key: new GlobalKey(),
         itemExtent: 290.0,
         scrollAnchor: ViewportAnchor.end,
-        padding: new EdgeInsets.fromLTRB(5.0, 20.0, 15.0, 10.0),
+        padding: const EdgeInsets.fromLTRB(5.0, 20.0, 15.0, 10.0),
         children: items.map((int item) {
           return new Container(
             child: new GestureDetector(
@@ -138,17 +138,17 @@ void main() {
         })
       )
     );
-    await tester.tapAt(new Point(200.0, 600.0 - 9.0));
+    await tester.tapAt(const Point(200.0, 600.0 - 9.0));
     expect(tapped, equals(<int>[]));
-    await tester.tapAt(new Point(200.0, 600.0 - 11.0));
+    await tester.tapAt(const Point(200.0, 600.0 - 11.0));
     expect(tapped, equals(<int>[5]));
-    await tester.tapAt(new Point(4.0, 200.0));
+    await tester.tapAt(const Point(4.0, 200.0));
     expect(tapped, equals(<int>[5]));
-    await tester.tapAt(new Point(6.0, 200.0));
+    await tester.tapAt(const Point(6.0, 200.0));
     expect(tapped, equals(<int>[5, 4]));
-    await tester.tapAt(new Point(800.0 - 14.0, 200.0));
+    await tester.tapAt(const Point(800.0 - 14.0, 200.0));
     expect(tapped, equals(<int>[5, 4]));
-    await tester.tapAt(new Point(800.0 - 16.0, 200.0));
+    await tester.tapAt(const Point(800.0 - 16.0, 200.0));
     expect(tapped, equals(<int>[5, 4, 4]));
   });
 
@@ -179,7 +179,7 @@ void main() {
     expect(scrollableKey.currentState.scrollOffset, equals(0.0));
     expect(scrollableKey.currentState.virtualScrollOffset, lessThan(0.0));
 
-    await tester.tapAt(new Point(200.0, 100.0));
+    await tester.tapAt(const Point(200.0, 100.0));
     expect(tapped, equals(<int>[0]));
   });
 }

packages/flutter/test/widgets/scrollable_list_vertical_test.dart

@@ -67,7 +67,7 @@ void main() {
     await tester.pumpWidget(
       new ScrollableList(
         itemExtent: 290.0,
-        padding: new EdgeInsets.only(top: 250.0),
+        padding: const EdgeInsets.only(top: 250.0),
         scrollDirection: Axis.vertical,
         children: items.map((int item) {
           return new Container(

packages/flutter/test/widgets/size_changed_layout_notification_test.dart

@@ -24,7 +24,7 @@ void main() {
           return true;
         },
         child: new SizeChangedLayoutNotifier(
-          child: new SizedBox(
+          child: const SizedBox(
             width: 100.0,
             height: 100.0
           )
@@ -39,7 +39,7 @@ void main() {
           return true;
         },
         child: new SizeChangedLayoutNotifier(
-          child: new SizedBox(
+          child: const SizedBox(
             width: 200.0,
             height: 100.0
           )

packages/flutter/test/widgets/stack_test.dart

@@ -199,8 +199,8 @@ void main() {
   testWidgets('Can set width and height', (WidgetTester tester) async {
     Key key = new Key('container');
 
-    BoxDecoration kBoxDecoration = new BoxDecoration(
-      backgroundColor: new Color(0xFF00FF00)
+    BoxDecoration kBoxDecoration = const BoxDecoration(
+      backgroundColor: const Color(0xFF00FF00)
     );
 
     await tester.pumpWidget(
@@ -273,7 +273,7 @@ void main() {
             new GestureDetector(
               behavior: HitTestBehavior.opaque,
               onTap: () { print("HELLO"); tapped = true; },
-              child: new SizedBox(
+              child: const SizedBox(
                 width: 200.0,
                 height: 200.0,
               ),

packages/flutter/test/widgets/state_setting_in_scrollables_test.dart

@@ -30,39 +30,39 @@ class FooState extends State<Foo> {
                   scrollableKey.currentState.scrollBy(200.0, duration: const Duration(milliseconds: 500));
                 },
                 child: new DecoratedBox(
-                  decoration: new BoxDecoration(backgroundColor: const Color(0)),
-                  child: new SizedBox(
+                  decoration: const BoxDecoration(backgroundColor: const Color(0)),
+                  child: const SizedBox(
                     height: 200.0,
                   ),
                 )
               ),
               new DecoratedBox(
-                decoration: new BoxDecoration(backgroundColor: const Color(0)),
-                child: new SizedBox(
+                decoration: const BoxDecoration(backgroundColor: const Color(0)),
+                child: const SizedBox(
                   height: 200.0,
                 ),
               ),
               new DecoratedBox(
-                decoration: new BoxDecoration(backgroundColor: const Color(0)),
-                child: new SizedBox(
+                decoration: const BoxDecoration(backgroundColor: const Color(0)),
+                child: const SizedBox(
                   height: 200.0,
                 ),
               ),
               new DecoratedBox(
-                decoration: new BoxDecoration(backgroundColor: const Color(0)),
-                child: new SizedBox(
+                decoration: const BoxDecoration(backgroundColor: const Color(0)),
+                child: const SizedBox(
                   height: 200.0,
                 ),
               ),
               new DecoratedBox(
-                decoration: new BoxDecoration(backgroundColor: const Color(0)),
-                child: new SizedBox(
+                decoration: const BoxDecoration(backgroundColor: const Color(0)),
+                child: const SizedBox(
                   height: 200.0,
                 ),
               ),
               new DecoratedBox(
-                decoration: new BoxDecoration(backgroundColor: const Color(0)),
-                child: new SizedBox(
+                decoration: const BoxDecoration(backgroundColor: const Color(0)),
+                child: const SizedBox(
                   height: 200.0,
                 ),
               ),

packages/flutter/test/widgets/table_test.dart

@@ -288,7 +288,7 @@ void main() {
       new Table(
         children: <TableRow>[
           new TableRow(
-            key: new ValueKey<int>(1),
+            key: const ValueKey<int>(1),
             children: <Widget>[
               new StatefulBuilder(
                 builder: (BuildContext context, StateSetter setState) {
@@ -315,7 +315,7 @@ void main() {
             ]
           ),
           new TableRow(
-            key: new ValueKey<int>(1),
+            key: const ValueKey<int>(1),
             children: <Widget>[
               new StatefulBuilder(
                 builder: (BuildContext context, StateSetter setState) {

packages/flutter/test/widgets/test_widgets.dart

@@ -5,15 +5,15 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/widgets.dart';
 
-final BoxDecoration kBoxDecorationA = new BoxDecoration(
+final BoxDecoration kBoxDecorationA = const BoxDecoration(
   backgroundColor: const Color(0xFFFF0000)
 );
 
-final BoxDecoration kBoxDecorationB = new BoxDecoration(
+final BoxDecoration kBoxDecorationB = const BoxDecoration(
   backgroundColor: const Color(0xFF00FF00)
 );
 
-final BoxDecoration kBoxDecorationC = new BoxDecoration(
+final BoxDecoration kBoxDecorationC = const BoxDecoration(
   backgroundColor: const Color(0xFF0000FF)
 );
 

packages/flutter/test/widgets/text_test.dart

@@ -8,7 +8,7 @@ import 'package:flutter/widgets.dart';
 void main() {
   testWidgets('Text respects media query', (WidgetTester tester) async {
     await tester.pumpWidget(new MediaQuery(
-      data: new MediaQueryData(textScaleFactor: 1.5),
+      data: const MediaQueryData(textScaleFactor: 1.5),
       child: new Center(
         child: new Text('Hello')
       )

packages/flutter/test/widgets/transform_test.dart

@@ -19,8 +19,8 @@ void main() {
             child: new Container(
               width: 100.0,
               height: 100.0,
-              decoration: new BoxDecoration(
-                backgroundColor: new Color(0xFF0000FF),
+              decoration: const BoxDecoration(
+                backgroundColor: const Color(0xFF0000FF),
               ),
             ),
           ),
@@ -32,14 +32,14 @@ void main() {
               height: 100.0,
               child: new Transform(
                 transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
-                origin: new Offset(100.0, 50.0),
+                origin: const Offset(100.0, 50.0),
                 child: new GestureDetector(
                   onTap: () {
                     didReceiveTap = true;
                   },
                   child: new Container(
-                    decoration: new BoxDecoration(
-                      backgroundColor: new Color(0xFF00FFFF),
+                    decoration: const BoxDecoration(
+                      backgroundColor: const Color(0xFF00FFFF),
                     ),
                   ),
                 ),
@@ -51,9 +51,9 @@ void main() {
     );
 
     expect(didReceiveTap, isFalse);
-    await tester.tapAt(new Point(110.0, 110.0));
+    await tester.tapAt(const Point(110.0, 110.0));
     expect(didReceiveTap, isFalse);
-    await tester.tapAt(new Point(190.0, 150.0));
+    await tester.tapAt(const Point(190.0, 150.0));
     expect(didReceiveTap, isTrue);
   });
 
@@ -68,8 +68,8 @@ void main() {
             child: new Container(
               width: 100.0,
               height: 100.0,
-              decoration: new BoxDecoration(
-                backgroundColor: new Color(0xFF0000FF),
+              decoration: const BoxDecoration(
+                backgroundColor: const Color(0xFF0000FF),
               ),
             ),
           ),
@@ -81,14 +81,14 @@ void main() {
               height: 100.0,
               child: new Transform(
                 transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
-                alignment: new FractionalOffset(1.0, 0.5),
+                alignment: const FractionalOffset(1.0, 0.5),
                 child: new GestureDetector(
                   onTap: () {
                     didReceiveTap = true;
                   },
                   child: new Container(
-                    decoration: new BoxDecoration(
-                      backgroundColor: new Color(0xFF00FFFF),
+                    decoration: const BoxDecoration(
+                      backgroundColor: const Color(0xFF00FFFF),
                     ),
                   ),
                 ),
@@ -100,9 +100,9 @@ void main() {
     );
 
     expect(didReceiveTap, isFalse);
-    await tester.tapAt(new Point(110.0, 110.0));
+    await tester.tapAt(const Point(110.0, 110.0));
     expect(didReceiveTap, isFalse);
-    await tester.tapAt(new Point(190.0, 150.0));
+    await tester.tapAt(const Point(190.0, 150.0));
     expect(didReceiveTap, isTrue);
   });
 
@@ -116,8 +116,8 @@ void main() {
           child: new Container(
             width: 100.0,
             height: 100.0,
-            decoration: new BoxDecoration(
-              backgroundColor: new Color(0xFF0000FF),
+            decoration: const BoxDecoration(
+              backgroundColor: const Color(0xFF0000FF),
             ),
           ),
         ),
@@ -129,15 +129,15 @@ void main() {
             height: 100.0,
             child: new Transform(
               transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
-              origin: new Offset(100.0, 0.0),
-              alignment: new FractionalOffset(0.0, 0.5),
+              origin: const Offset(100.0, 0.0),
+              alignment: const FractionalOffset(0.0, 0.5),
               child: new GestureDetector(
                 onTap: () {
                   didReceiveTap = true;
                 },
                 child: new Container(
-                  decoration: new BoxDecoration(
-                    backgroundColor: new Color(0xFF00FFFF),
+                  decoration: const BoxDecoration(
+                    backgroundColor: const Color(0xFF00FFFF),
                   ),
                 ),
               ),
@@ -148,9 +148,9 @@ void main() {
     ));
 
     expect(didReceiveTap, isFalse);
-    await tester.tapAt(new Point(110.0, 110.0));
+    await tester.tapAt(const Point(110.0, 110.0));
     expect(didReceiveTap, isFalse);
-    await tester.tapAt(new Point(190.0, 150.0));
+    await tester.tapAt(const Point(190.0, 150.0));
     expect(didReceiveTap, isTrue);
   });
 
@@ -166,7 +166,7 @@ void main() {
               child: new Opacity(
                 opacity: 0.9,
                 child: new Container(
-                  decoration: new BoxDecoration(
+                  decoration: const BoxDecoration(
                     backgroundColor: const Color(0xFF00FF00),
                   ),
                 ),