packages/flutter/test/cupertino/nav_bar_test.dart - mirrors/flutter - Git at Google

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'package:flutter/cupertino.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart' hide TypeMatcher;

 int count = 0;

 void main() {
   testWidgets('Middle still in center with asymmetrical actions', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 leading: const CupertinoButton(child: const Text('Something'), onPressed: null,),
                 middle: const Text('Title'),
               );
             },
           );
         },
       ),
     );

     // Expect the middle of the title to be exactly in the middle of the screen.
     expect(tester.getCenter(find.text('Title')).dx, 400.0);
   });

   testWidgets('Opaque background does not add blur effects', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 middle: const Text('Title'),
                 backgroundColor: const Color(0xFFE5E5E5),
               );
             },
           );
         },
       ),
     );
     expect(find.byType(BackdropFilter), findsNothing);
   });

   testWidgets('Non-opaque background adds blur effects', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 middle: const Text('Title'),
               );
             },
           );
         },
       ),
     );
     expect(find.byType(BackdropFilter), findsOneWidget);
   });

   testWidgets('Verify styles of each slot', (WidgetTester tester) async {
     count = 0x000000;
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 leading: const _ExpectStyles(color: const Color(0xFF001122), index: 0x000001),
                 middle: const _ExpectStyles(color: const Color(0xFF000000), letterSpacing: -0.72, index: 0x000100),
                 trailing: const _ExpectStyles(color: const Color(0xFF001122), index: 0x010000),
                 actionsForegroundColor: const Color(0xFF001122),
               );
             },
           );
         },
       ),
     );
     expect(count, 0x010101);
   });

   testWidgets('No slivers with no large titles', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoPageScaffold(
                 navigationBar: const CupertinoNavigationBar(
                   middle: const Text('Title'),
                 ),
                 child: const Center(),
               );
             },
           );
         },
       ),
     );

     expect(find.byType(SliverPersistentHeader), findsNothing);
   });

   testWidgets('Media padding is applied to CupertinoSliverNavigationBar', (WidgetTester tester) async {
     final ScrollController scrollController = new ScrollController();
     final Key leadingKey = new GlobalKey();
     final Key middleKey = new GlobalKey();
     final Key trailingKey = new GlobalKey();
     final Key titleKey = new GlobalKey();
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return new MediaQuery(
                 data: const MediaQueryData(
                   padding: const EdgeInsets.only(
                     top: 10.0,
                     left: 20.0,
                     bottom: 30.0,
                     right: 40.0,
                   ),
                 ),
                 child: new CupertinoPageScaffold(
                   child: new CustomScrollView(
                     controller: scrollController,
                     slivers: <Widget>[
                       new CupertinoSliverNavigationBar(
                         leading: new Placeholder(key: leadingKey),
                         middle: new Placeholder(key: middleKey),
                         largeTitle: new Text('Large Title', key: titleKey),
                         trailing: new Placeholder(key: trailingKey),
                       ),
                       new SliverToBoxAdapter(
                         child: new Container(
                           height: 1200.0,
                         ),
                       ),
                     ],
                   ),
                 ),
               );
             },
           );
         },
       ),
     );

     // Media padding applied to leading (T,L), middle (T), trailing (T, R).
     expect(tester.getTopLeft(find.byKey(leadingKey)), const Offset(16.0 + 20.0, 10.0));
     expect(tester.getRect(find.byKey(middleKey)).top, 10.0);
     expect(tester.getTopRight(find.byKey(trailingKey)), const Offset(800.0 - 16.0 - 40.0, 10.0));

     // Top and left padding is applied to large title.
     expect(tester.getTopLeft(find.byKey(titleKey)), const Offset(16.0 + 20.0, 58.0 + 10.0));
   });

   testWidgets('Large title nav bar scrolls', (WidgetTester tester) async {
     final ScrollController scrollController = new ScrollController();
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return new CupertinoPageScaffold(
                 child: new CustomScrollView(
                   controller: scrollController,
                   slivers: <Widget>[
                     const CupertinoSliverNavigationBar(
                       largeTitle: const Text('Title'),
                     ),
                     new SliverToBoxAdapter(
                       child: new Container(
                         height: 1200.0,
                       ),
                     ),
                   ],
                 ),
               );
             },
           );
         },
       ),
     );

     expect(scrollController.offset, 0.0);
     expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
     expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

     expect(find.text('Title'), findsNWidgets(2)); // Though only one is visible.

     List<Element> titles = tester.elementList(find.text('Title'))
         .toList()
         ..sort((Element a, Element b) {
           final RenderParagraph aParagraph = a.renderObject;
           final RenderParagraph bParagraph = b.renderObject;
           return aParagraph.text.style.fontSize.compareTo(bParagraph.text.style.fontSize);
         });

     Iterable<double> opacities = titles.map((Element element) {
       final RenderOpacity renderOpacity = element.ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
       return renderOpacity.opacity;
     });

     expect(opacities, <double> [
         0.0, // Initially the smaller font title is invisible.
         1.0, // The larger font title is visible.
     ]);

     expect(tester.getTopLeft(find.widgetWithText(OverflowBox, 'Title')).dy, 44.0);
     expect(tester.getSize(find.widgetWithText(OverflowBox, 'Title')).height, 56.0);

     scrollController.jumpTo(600.0);
     await tester.pump(); // Once to trigger the opacity animation.
     await tester.pump(const Duration(milliseconds: 300));

     titles = tester.elementList(find.text('Title'))
         .toList()
         ..sort((Element a, Element b) {
           final RenderParagraph aParagraph = a.renderObject;
           final RenderParagraph bParagraph = b.renderObject;
           return aParagraph.text.style.fontSize.compareTo(bParagraph.text.style.fontSize);
         });

     opacities = titles.map((Element element) {
       final RenderOpacity renderOpacity = element.ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
       return renderOpacity.opacity;
     });

     expect(opacities, <double> [
         1.0, // Smaller font title now visible
         0.0, // Larger font title invisible.
     ]);

     // The persistent toolbar doesn't move or change size.
     expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
     expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

     expect(tester.getTopLeft(find.widgetWithText(OverflowBox, 'Title')).dy, 44.0);
     // The OverflowBox is squished with the text in it.
     expect(tester.getSize(find.widgetWithText(OverflowBox, 'Title')).height, 0.0);
   });

   testWidgets('Small title can be overridden', (WidgetTester tester) async {
     final ScrollController scrollController = new ScrollController();
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return new CupertinoPageScaffold(
                 child: new CustomScrollView(
                   controller: scrollController,
                   slivers: <Widget>[
                     const CupertinoSliverNavigationBar(
                       middle: const Text('Different title'),
                       largeTitle: const Text('Title'),
                     ),
                     new SliverToBoxAdapter(
                       child: new Container(
                         height: 1200.0,
                       ),
                     ),
                   ],
                 ),
               );
             },
           );
         },
       ),
     );

     expect(scrollController.offset, 0.0);
     expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
     expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

     expect(find.text('Title'), findsOneWidget);
     expect(find.text('Different title'), findsOneWidget);

     RenderOpacity largeTitleOpacity =
         tester.element(find.text('Title')).ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
     // Large title initially visible.
     expect(
       largeTitleOpacity.opacity,
       1.0
     );
     // Middle widget not even wrapped with RenderOpacity, i.e. is always visible.
     expect(
       tester.element(find.text('Different title')).ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>()),
       isNull,
     );

     expect(tester.getBottomLeft(find.text('Title')).dy, 44.0 + 56.0 - 8.0); // Static part + extension - padding.

     scrollController.jumpTo(600.0);
     await tester.pump(); // Once to trigger the opacity animation.
     await tester.pump(const Duration(milliseconds: 300));

     largeTitleOpacity =
         tester.element(find.text('Title')).ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
     // Large title no longer visible.
     expect(
       largeTitleOpacity.opacity,
       0.0
     );

     // The persistent toolbar doesn't move or change size.
     expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
     expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

     expect(tester.getBottomLeft(find.text('Title')).dy, 44.0 - 8.0); // Extension gone, (static part - padding) left.
   });

   testWidgets('Auto back/close button', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 middle: const Text('Home page'),
               );
             },
           );
         },
       ),
     );

     expect(find.byType(CupertinoButton), findsNothing);

     tester.state<NavigatorState>(find.byType(Navigator)).push(new CupertinoPageRoute<void>(
       builder: (BuildContext context) {
         return const CupertinoNavigationBar(
           middle: const Text('Page 2'),
         );
       },
     ));

     await tester.pump();
     await tester.pump(const Duration(milliseconds: 200));

     expect(find.byType(CupertinoButton), findsOneWidget);
     expect(find.byType(Icon), findsOneWidget);

     tester.state<NavigatorState>(find.byType(Navigator)).push(new CupertinoPageRoute<void>(
       fullscreenDialog: true,
       builder: (BuildContext context) {
         return const CupertinoNavigationBar(
           middle: const Text('Dialog page'),
         );
       },
     ));

     await tester.pump();
     await tester.pump(const Duration(milliseconds: 200));

     expect(find.byType(CupertinoButton), findsNWidgets(2));
     expect(find.text('Close'), findsOneWidget);

     // Test popping goes back correctly.
     await tester.tap(find.text('Close'));

     await tester.pump();
     await tester.pump(const Duration(milliseconds: 200));

     expect(find.text('Page 2'), findsOneWidget);

     await tester.tap(find.byType(Icon));

     await tester.pump();
     await tester.pump(const Duration(milliseconds: 200));

     expect(find.text('Home page'), findsOneWidget);
   });

   testWidgets('Border should be displayed by default', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 middle: const Text('Title'),
               );
             },
           );
         },
       ),
     );

     final DecoratedBox decoratedBox = tester.widgetList(find.byType(DecoratedBox)).elementAt(1);
     expect(decoratedBox.decoration.runtimeType, BoxDecoration);

     final BoxDecoration decoration = decoratedBox.decoration;
     expect(decoration.border, isNotNull);

     final BorderSide side = decoration.border.bottom;
     expect(side, isNotNull);
   });

   testWidgets('Overrides border color', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 middle: const Text('Title'),
                 border: const Border(
                   bottom: const BorderSide(
                     color: const Color(0xFFAABBCC),
                     width: 0.0,
                   ),
                 ),
               );
             },
           );
         },
       ),
     );

     final DecoratedBox decoratedBox = tester.widgetList(find.byType(DecoratedBox)).elementAt(1);
     expect(decoratedBox.decoration.runtimeType, BoxDecoration);

     final BoxDecoration decoration = decoratedBox.decoration;
     expect(decoration.border, isNotNull);

     final BorderSide side = decoration.border.bottom;
     expect(side, isNotNull);
     expect(side.color, const Color(0xFFAABBCC));
   });

   testWidgets('Border should not be displayed when null', (WidgetTester tester) async {
     await tester.pumpWidget(
       new WidgetsApp(
         color: const Color(0xFFFFFFFF),
         onGenerateRoute: (RouteSettings settings) {
           return new CupertinoPageRoute<void>(
             settings: settings,
             builder: (BuildContext context) {
               return const CupertinoNavigationBar(
                 middle: const Text('Title'),
                 border: null,
               );
             },
           );
         },
       ),
     );

     final DecoratedBox decoratedBox = tester.widgetList(find.byType(DecoratedBox)).elementAt(1);
     expect(decoratedBox.decoration.runtimeType, BoxDecoration);

     final BoxDecoration decoration = decoratedBox.decoration;
     expect(decoration.border, isNull);
   });
 }

 class _ExpectStyles extends StatelessWidget {
   const _ExpectStyles({ this.color, this.letterSpacing, this.index });

   final Color color;
   final double letterSpacing;
   final int index;

   @override
   Widget build(BuildContext context) {
     final TextStyle style = DefaultTextStyle.of(context).style;
     expect(style.color, color);
     expect(style.fontSize, 17.0);
     expect(style.letterSpacing, letterSpacing ?? -0.24);
     count += index;
     return new Container();
   }
 }
	// Copyright 2017 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'package:flutter/cupertino.dart';
	import 'package:flutter/rendering.dart';
	import 'package:flutter_test/flutter_test.dart' hide TypeMatcher;

	int count = 0;

	void main() {
	testWidgets('Middle still in center with asymmetrical actions', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	leading: const CupertinoButton(child: const Text('Something'), onPressed: null,),
	middle: const Text('Title'),
	);
	},
	);
	},
	),
	);

	// Expect the middle of the title to be exactly in the middle of the screen.
	expect(tester.getCenter(find.text('Title')).dx, 400.0);
	});

	testWidgets('Opaque background does not add blur effects', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Title'),
	backgroundColor: const Color(0xFFE5E5E5),
	);
	},
	);
	},
	),
	);
	expect(find.byType(BackdropFilter), findsNothing);
	});

	testWidgets('Non-opaque background adds blur effects', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Title'),
	);
	},
	);
	},
	),
	);
	expect(find.byType(BackdropFilter), findsOneWidget);
	});

	testWidgets('Verify styles of each slot', (WidgetTester tester) async {
	count = 0x000000;
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	leading: const _ExpectStyles(color: const Color(0xFF001122), index: 0x000001),
	middle: const _ExpectStyles(color: const Color(0xFF000000), letterSpacing: -0.72, index: 0x000100),
	trailing: const _ExpectStyles(color: const Color(0xFF001122), index: 0x010000),
	actionsForegroundColor: const Color(0xFF001122),
	);
	},
	);
	},
	),
	);
	expect(count, 0x010101);
	});

	testWidgets('No slivers with no large titles', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoPageScaffold(
	navigationBar: const CupertinoNavigationBar(
	middle: const Text('Title'),
	),
	child: const Center(),
	);
	},
	);
	},
	),
	);

	expect(find.byType(SliverPersistentHeader), findsNothing);
	});

	testWidgets('Media padding is applied to CupertinoSliverNavigationBar', (WidgetTester tester) async {
	final ScrollController scrollController = new ScrollController();
	final Key leadingKey = new GlobalKey();
	final Key middleKey = new GlobalKey();
	final Key trailingKey = new GlobalKey();
	final Key titleKey = new GlobalKey();
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return new MediaQuery(
	data: const MediaQueryData(
	padding: const EdgeInsets.only(
	top: 10.0,
	left: 20.0,
	bottom: 30.0,
	right: 40.0,
	),
	),
	child: new CupertinoPageScaffold(
	child: new CustomScrollView(
	controller: scrollController,
	slivers: <Widget>[
	new CupertinoSliverNavigationBar(
	leading: new Placeholder(key: leadingKey),
	middle: new Placeholder(key: middleKey),
	largeTitle: new Text('Large Title', key: titleKey),
	trailing: new Placeholder(key: trailingKey),
	),
	new SliverToBoxAdapter(
	child: new Container(
	height: 1200.0,
	),
	),
	],
	),
	),
	);
	},
	);
	},
	),
	);

	// Media padding applied to leading (T,L), middle (T), trailing (T, R).
	expect(tester.getTopLeft(find.byKey(leadingKey)), const Offset(16.0 + 20.0, 10.0));
	expect(tester.getRect(find.byKey(middleKey)).top, 10.0);
	expect(tester.getTopRight(find.byKey(trailingKey)), const Offset(800.0 - 16.0 - 40.0, 10.0));

	// Top and left padding is applied to large title.
	expect(tester.getTopLeft(find.byKey(titleKey)), const Offset(16.0 + 20.0, 58.0 + 10.0));
	});

	testWidgets('Large title nav bar scrolls', (WidgetTester tester) async {
	final ScrollController scrollController = new ScrollController();
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return new CupertinoPageScaffold(
	child: new CustomScrollView(
	controller: scrollController,
	slivers: <Widget>[
	const CupertinoSliverNavigationBar(
	largeTitle: const Text('Title'),
	),
	new SliverToBoxAdapter(
	child: new Container(
	height: 1200.0,
	),
	),
	],
	),
	);
	},
	);
	},
	),
	);

	expect(scrollController.offset, 0.0);
	expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
	expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

	expect(find.text('Title'), findsNWidgets(2)); // Though only one is visible.

	List<Element> titles = tester.elementList(find.text('Title'))
	.toList()
	..sort((Element a, Element b) {
	final RenderParagraph aParagraph = a.renderObject;
	final RenderParagraph bParagraph = b.renderObject;
	return aParagraph.text.style.fontSize.compareTo(bParagraph.text.style.fontSize);
	});

	Iterable<double> opacities = titles.map((Element element) {
	final RenderOpacity renderOpacity = element.ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
	return renderOpacity.opacity;
	});

	expect(opacities, <double> [
	0.0, // Initially the smaller font title is invisible.
	1.0, // The larger font title is visible.
	]);

	expect(tester.getTopLeft(find.widgetWithText(OverflowBox, 'Title')).dy, 44.0);
	expect(tester.getSize(find.widgetWithText(OverflowBox, 'Title')).height, 56.0);

	scrollController.jumpTo(600.0);
	await tester.pump(); // Once to trigger the opacity animation.
	await tester.pump(const Duration(milliseconds: 300));

	titles = tester.elementList(find.text('Title'))
	.toList()
	..sort((Element a, Element b) {
	final RenderParagraph aParagraph = a.renderObject;
	final RenderParagraph bParagraph = b.renderObject;
	return aParagraph.text.style.fontSize.compareTo(bParagraph.text.style.fontSize);
	});

	opacities = titles.map((Element element) {
	final RenderOpacity renderOpacity = element.ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
	return renderOpacity.opacity;
	});

	expect(opacities, <double> [
	1.0, // Smaller font title now visible
	0.0, // Larger font title invisible.
	]);

	// The persistent toolbar doesn't move or change size.
	expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
	expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

	expect(tester.getTopLeft(find.widgetWithText(OverflowBox, 'Title')).dy, 44.0);
	// The OverflowBox is squished with the text in it.
	expect(tester.getSize(find.widgetWithText(OverflowBox, 'Title')).height, 0.0);
	});

	testWidgets('Small title can be overridden', (WidgetTester tester) async {
	final ScrollController scrollController = new ScrollController();
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return new CupertinoPageScaffold(
	child: new CustomScrollView(
	controller: scrollController,
	slivers: <Widget>[
	const CupertinoSliverNavigationBar(
	middle: const Text('Different title'),
	largeTitle: const Text('Title'),
	),
	new SliverToBoxAdapter(
	child: new Container(
	height: 1200.0,
	),
	),
	],
	),
	);
	},
	);
	},
	),
	);

	expect(scrollController.offset, 0.0);
	expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
	expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

	expect(find.text('Title'), findsOneWidget);
	expect(find.text('Different title'), findsOneWidget);

	RenderOpacity largeTitleOpacity =
	tester.element(find.text('Title')).ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
	// Large title initially visible.
	expect(
	largeTitleOpacity.opacity,
	1.0
	);
	// Middle widget not even wrapped with RenderOpacity, i.e. is always visible.
	expect(
	tester.element(find.text('Different title')).ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>()),
	isNull,
	);

	expect(tester.getBottomLeft(find.text('Title')).dy, 44.0 + 56.0 - 8.0); // Static part + extension - padding.

	scrollController.jumpTo(600.0);
	await tester.pump(); // Once to trigger the opacity animation.
	await tester.pump(const Duration(milliseconds: 300));

	largeTitleOpacity =
	tester.element(find.text('Title')).ancestorRenderObjectOfType(const TypeMatcher<RenderOpacity>());
	// Large title no longer visible.
	expect(
	largeTitleOpacity.opacity,
	0.0
	);

	// The persistent toolbar doesn't move or change size.
	expect(tester.getTopLeft(find.byType(NavigationToolbar)).dy, 0.0);
	expect(tester.getSize(find.byType(NavigationToolbar)).height, 44.0);

	expect(tester.getBottomLeft(find.text('Title')).dy, 44.0 - 8.0); // Extension gone, (static part - padding) left.
	});

	testWidgets('Auto back/close button', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Home page'),
	);
	},
	);
	},
	),
	);

	expect(find.byType(CupertinoButton), findsNothing);

	tester.state<NavigatorState>(find.byType(Navigator)).push(new CupertinoPageRoute<void>(
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Page 2'),
	);
	},
	));

	await tester.pump();
	await tester.pump(const Duration(milliseconds: 200));

	expect(find.byType(CupertinoButton), findsOneWidget);
	expect(find.byType(Icon), findsOneWidget);

	tester.state<NavigatorState>(find.byType(Navigator)).push(new CupertinoPageRoute<void>(
	fullscreenDialog: true,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Dialog page'),
	);
	},
	));

	await tester.pump();
	await tester.pump(const Duration(milliseconds: 200));

	expect(find.byType(CupertinoButton), findsNWidgets(2));
	expect(find.text('Close'), findsOneWidget);

	// Test popping goes back correctly.
	await tester.tap(find.text('Close'));

	await tester.pump();
	await tester.pump(const Duration(milliseconds: 200));

	expect(find.text('Page 2'), findsOneWidget);

	await tester.tap(find.byType(Icon));

	await tester.pump();
	await tester.pump(const Duration(milliseconds: 200));

	expect(find.text('Home page'), findsOneWidget);
	});

	testWidgets('Border should be displayed by default', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Title'),
	);
	},
	);
	},
	),
	);

	final DecoratedBox decoratedBox = tester.widgetList(find.byType(DecoratedBox)).elementAt(1);
	expect(decoratedBox.decoration.runtimeType, BoxDecoration);

	final BoxDecoration decoration = decoratedBox.decoration;
	expect(decoration.border, isNotNull);

	final BorderSide side = decoration.border.bottom;
	expect(side, isNotNull);
	});

	testWidgets('Overrides border color', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Title'),
	border: const Border(
	bottom: const BorderSide(
	color: const Color(0xFFAABBCC),
	width: 0.0,
	),
	),
	);
	},
	);
	},
	),
	);

	final DecoratedBox decoratedBox = tester.widgetList(find.byType(DecoratedBox)).elementAt(1);
	expect(decoratedBox.decoration.runtimeType, BoxDecoration);

	final BoxDecoration decoration = decoratedBox.decoration;
	expect(decoration.border, isNotNull);

	final BorderSide side = decoration.border.bottom;
	expect(side, isNotNull);
	expect(side.color, const Color(0xFFAABBCC));
	});

	testWidgets('Border should not be displayed when null', (WidgetTester tester) async {
	await tester.pumpWidget(
	new WidgetsApp(
	color: const Color(0xFFFFFFFF),
	onGenerateRoute: (RouteSettings settings) {
	return new CupertinoPageRoute<void>(
	settings: settings,
	builder: (BuildContext context) {
	return const CupertinoNavigationBar(
	middle: const Text('Title'),
	border: null,
	);
	},
	);
	},
	),
	);

	final DecoratedBox decoratedBox = tester.widgetList(find.byType(DecoratedBox)).elementAt(1);
	expect(decoratedBox.decoration.runtimeType, BoxDecoration);

	final BoxDecoration decoration = decoratedBox.decoration;
	expect(decoration.border, isNull);
	});
	}

	class _ExpectStyles extends StatelessWidget {
	const _ExpectStyles({ this.color, this.letterSpacing, this.index });

	final Color color;
	final double letterSpacing;
	final int index;

	@override
	Widget build(BuildContext context) {
	final TextStyle style = DefaultTextStyle.of(context).style;
	expect(style.color, color);
	expect(style.fontSize, 17.0);
	expect(style.letterSpacing, letterSpacing ?? -0.24);
	count += index;
	return new Container();
	}
	}