packages/flutter/test/material/about_test.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'dart:async';

 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';

 void main() {
   tearDown(() {
     LicenseRegistry.reset();
   });

   testWidgets('AboutListTile control test', (WidgetTester tester) async {
     const FlutterLogo logo = FlutterLogo();

     await tester.pumpWidget(
       MaterialApp(
         title: 'Pirate app',
         home: Scaffold(
           appBar: AppBar(
             title: const Text('Home'),
           ),
           drawer: Drawer(
             child: ListView(
               children: const <Widget>[
                 AboutListTile(
                   applicationVersion: '0.1.2',
                   applicationIcon: logo,
                   applicationLegalese: 'I am the very model of a modern major general.',
                   aboutBoxChildren: <Widget>[
                     Text('About box'),
                   ],
                 ),
               ],
             ),
           ),
         ),
       ),
     );

     expect(find.text('About Pirate app'), findsNothing);
     expect(find.text('0.1.2'), findsNothing);
     expect(find.byWidget(logo), findsNothing);
     expect(
       find.text('I am the very model of a modern major general.'),
       findsNothing,
     );
     expect(find.text('About box'), findsNothing);

     await tester.tap(find.byType(IconButton));
     await tester.pumpAndSettle(const Duration(milliseconds: 100));

     expect(find.text('About Pirate app'), findsOneWidget);
     expect(find.text('0.1.2'), findsNothing);
     expect(find.byWidget(logo), findsNothing);
     expect(
       find.text('I am the very model of a modern major general.'),
       findsNothing,
     );
     expect(find.text('About box'), findsNothing);

     await tester.tap(find.text('About Pirate app'));
     await tester.pumpAndSettle(const Duration(milliseconds: 100));

     expect(find.text('About Pirate app'), findsOneWidget);
     expect(find.text('0.1.2'), findsOneWidget);
     expect(find.byWidget(logo), findsOneWidget);
     expect(
       find.text('I am the very model of a modern major general.'),
       findsOneWidget,
     );
     expect(find.text('About box'), findsOneWidget);

     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
         const LicenseEntryWithLineBreaks(<String>['Pirate package '], 'Pirate license'),
       ]);
     });

     await tester.tap(find.text('VIEW LICENSES'));
     await tester.pumpAndSettle(const Duration(milliseconds: 100));

     expect(find.text('Pirate app'), findsOneWidget);
     expect(find.text('0.1.2'), findsOneWidget);
     expect(find.byWidget(logo), findsOneWidget);
     expect(
       find.text('I am the very model of a modern major general.'),
       findsOneWidget,
     );
     expect(find.text('Pirate license'), findsOneWidget);
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

   testWidgets('About box logic defaults to executable name for app name', (WidgetTester tester) async {
     await tester.pumpWidget(
       const MaterialApp(
         title: 'flutter_tester',
         home: Material(child: AboutListTile()),
       ),
     );
     expect(find.text('About flutter_tester'), findsOneWidget);
   });

   testWidgets('LicensePage control test', (WidgetTester tester) async {
     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
         const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
       ]);
     });

     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
         const LicenseEntryWithLineBreaks(
           <String>['Another package'],
           'Another license',
         ),
       ]);
     });

     await tester.pumpWidget(
       const MaterialApp(
         home: Center(
           child: LicensePage(),
         ),
       ),
     );

     expect(find.text('AAA'), findsNothing);
     expect(find.text('BBB'), findsNothing);
     expect(find.text('Another package'), findsNothing);
     expect(find.text('Another license'), findsNothing);

     await tester.pumpAndSettle();

     expect(find.text('AAA'), findsOneWidget);
     expect(find.text('BBB'), findsOneWidget);
     expect(find.text('Another package'), findsOneWidget);
     expect(find.text('Another license'), findsOneWidget);
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

   testWidgets('LicensePage control test with all properties', (WidgetTester tester) async {
     const FlutterLogo logo = FlutterLogo();

     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
         const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
       ]);
     });

     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
         const LicenseEntryWithLineBreaks(
           <String>['Another package'],
           'Another license',
         ),
       ]);
     });

     await tester.pumpWidget(
       const MaterialApp(
         title: 'Pirate app',
         home: Center(
           child: LicensePage(
             applicationName: 'LicensePage test app',
             applicationVersion: '0.1.2',
             applicationIcon: logo,
             applicationLegalese: 'I am the very model of a modern major general.',
           ),
         ),
       ),
     );

     expect(find.text('Pirate app'), findsNothing);
     expect(find.text('LicensePage test app'), findsOneWidget);
     expect(find.text('0.1.2'), findsOneWidget);
     expect(find.byWidget(logo), findsOneWidget);
     expect(
       find.text('I am the very model of a modern major general.'),
       findsOneWidget,
     );
     expect(find.text('AAA'), findsNothing);
     expect(find.text('BBB'), findsNothing);
     expect(find.text('Another package'), findsNothing);
     expect(find.text('Another license'), findsNothing);

     await tester.pumpAndSettle();

     expect(find.text('Pirate app'), findsNothing);
     expect(find.text('LicensePage test app'), findsOneWidget);
     expect(find.text('0.1.2'), findsOneWidget);
     expect(find.byWidget(logo), findsOneWidget);
     expect(
       find.text('I am the very model of a modern major general.'),
       findsOneWidget,
     );
     expect(find.text('AAA'), findsOneWidget);
     expect(find.text('BBB'), findsOneWidget);
     expect(find.text('Another package'), findsOneWidget);
     expect(find.text('Another license'), findsOneWidget);
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

   testWidgets('LicensePage respects the notch', (WidgetTester tester) async {
     const double safeareaPadding = 27.0;

     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
         const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
       ]);
     });

     await tester.pumpWidget(
       const MaterialApp(
         home: MediaQuery(
           data: MediaQueryData(
             padding: EdgeInsets.all(safeareaPadding),
           ),
           child: LicensePage(),
         ),
       ),
     );

     await tester.pumpAndSettle();

     expect(tester.getTopLeft(find.text('DEF')), const Offset(8.0 + safeareaPadding, 287.0));
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

   testWidgets('LicensePage returns early if unmounted', (WidgetTester tester) async {
     final Completer<LicenseEntry> licenseCompleter = Completer<LicenseEntry>();
     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromFuture(licenseCompleter.future);
     });

     await tester.pumpWidget(
       const MaterialApp(
         home: LicensePage(),
       ),
     );
     await tester.pump();

     await tester.pumpWidget(
       const MaterialApp(
         home: Placeholder(),
       ),
     );

     await tester.pumpAndSettle();
     final FakeLicenseEntry licenseEntry = FakeLicenseEntry();
     licenseCompleter.complete(licenseEntry);
     expect(licenseEntry.paragraphsCalled, false);
   });

   testWidgets('LicensePage returns late if unmounted', (WidgetTester tester) async {
     final Completer<LicenseEntry> licenseCompleter = Completer<LicenseEntry>();
     LicenseRegistry.addLicense(() {
       return Stream<LicenseEntry>.fromFuture(licenseCompleter.future);
     });

     await tester.pumpWidget(
       const MaterialApp(
         home: LicensePage(),
       ),
     );
     await tester.pump();
     final FakeLicenseEntry licenseEntry = FakeLicenseEntry();
     licenseCompleter.complete(licenseEntry);

     await tester.pumpWidget(
       const MaterialApp(
         home: Placeholder(),
       ),
     );

     await tester.pumpAndSettle();
     expect(licenseEntry.paragraphsCalled, true);
   });

   testWidgets('LicensePage logic defaults to executable name for app name', (WidgetTester tester) async {
     await tester.pumpWidget(
       const MaterialApp(
         title: 'flutter_tester',
         home: Material(child: LicensePage()),
       ),
     );
     expect(find.text('flutter_tester'), findsOneWidget);
   });

   testWidgets('AboutListTile dense property is applied', (WidgetTester tester) async {
     await tester.pumpWidget(const MaterialApp(
       home: Material(child: Center(child: AboutListTile())),
     ));
     Rect tileRect = tester.getRect(find.byType(AboutListTile));
     expect(tileRect.height, 56.0);

     await tester.pumpWidget(const MaterialApp(
       home: Material(child: Center(child: AboutListTile(dense: false))),
     ));
     tileRect = tester.getRect(find.byType(AboutListTile));
     expect(tileRect.height, 56.0);

     await tester.pumpWidget(const MaterialApp(
       home: Material(child: Center(child: AboutListTile(dense: true))),
     ));
     tileRect = tester.getRect(find.byType(AboutListTile));
     expect(tileRect.height, 48.0);
   });

   testWidgets('showLicensePage uses nested navigator by default', (WidgetTester tester) async {
     final LicensePageObserver rootObserver = LicensePageObserver();
     final LicensePageObserver nestedObserver = LicensePageObserver();

     await tester.pumpWidget(MaterialApp(
       navigatorObservers: <NavigatorObserver>[rootObserver],
       initialRoute: '/',
       onGenerateRoute: (_) {
         return PageRouteBuilder<dynamic>(
           pageBuilder: (_, __, ___) => Navigator(
             observers: <NavigatorObserver>[nestedObserver],
             onGenerateRoute: (RouteSettings settings) {
               return PageRouteBuilder<dynamic>(
                 pageBuilder: (BuildContext context, _, __) {
                   return RaisedButton(
                     onPressed: () {
                       showLicensePage(
                         context: context,
                         applicationName: 'A',
                       );
                     },
                     child: const Text('Show License Page'),
                   );
                 },
               );
             },
           ),
         );
       },
     ));

     // Open the dialog.
     await tester.tap(find.byType(RaisedButton));

     expect(rootObserver.licensePageCount, 0);
     expect(nestedObserver.licensePageCount, 1);
   });

   testWidgets('showLicensePage uses root navigator if useRootNavigator is true', (WidgetTester tester) async {
     final LicensePageObserver rootObserver = LicensePageObserver();
     final LicensePageObserver nestedObserver = LicensePageObserver();

     await tester.pumpWidget(MaterialApp(
       navigatorObservers: <NavigatorObserver>[rootObserver],
       initialRoute: '/',
       onGenerateRoute: (_) {
         return PageRouteBuilder<dynamic>(
           pageBuilder: (_, __, ___) => Navigator(
             observers: <NavigatorObserver>[nestedObserver],
             onGenerateRoute: (RouteSettings settings) {
               return PageRouteBuilder<dynamic>(
                 pageBuilder: (BuildContext context, _, __) {
                   return RaisedButton(
                     onPressed: () {
                       showLicensePage(
                         context: context,
                         useRootNavigator: true,
                         applicationName: 'A',
                       );
                     },
                     child: const Text('Show License Page'),
                   );
                 },
               );
             },
           ),
         );
       },
     ));

     // Open the dialog.
     await tester.tap(find.byType(RaisedButton));

     expect(rootObserver.licensePageCount, 1);
     expect(nestedObserver.licensePageCount, 0);
   });

   testWidgets('showAboutDialog uses root navigator by default', (WidgetTester tester) async {
     final AboutDialogObserver rootObserver = AboutDialogObserver();
     final AboutDialogObserver nestedObserver = AboutDialogObserver();

     await tester.pumpWidget(MaterialApp(
       navigatorObservers: <NavigatorObserver>[rootObserver],
       home: Navigator(
         observers: <NavigatorObserver>[nestedObserver],
         onGenerateRoute: (RouteSettings settings) {
           return MaterialPageRoute<dynamic>(
             builder: (BuildContext context) {
               return RaisedButton(
                 onPressed: () {
                   showAboutDialog(
                     context: context,
                     applicationName: 'A',
                   );
                 },
                 child: const Text('Show About Dialog'),
               );
             },
           );
         },
       ),
     ));

     // Open the dialog.
     await tester.tap(find.byType(RaisedButton));

     expect(rootObserver.dialogCount, 1);
     expect(nestedObserver.dialogCount, 0);
   });

   testWidgets('showAboutDialog uses nested navigator if useRootNavigator is false', (WidgetTester tester) async {
     final AboutDialogObserver rootObserver = AboutDialogObserver();
     final AboutDialogObserver nestedObserver = AboutDialogObserver();

     await tester.pumpWidget(MaterialApp(
       navigatorObservers: <NavigatorObserver>[rootObserver],
       home: Navigator(
         observers: <NavigatorObserver>[nestedObserver],
         onGenerateRoute: (RouteSettings settings) {
           return MaterialPageRoute<dynamic>(
             builder: (BuildContext context) {
               return RaisedButton(
                 onPressed: () {
                   showAboutDialog(
                     context: context,
                     useRootNavigator: false,
                     applicationName: 'A',
                   );
                 },
                 child: const Text('Show About Dialog'),
               );
             },
           );
         },
       ),
     ));

     // Open the dialog.
     await tester.tap(find.byType(RaisedButton));

     expect(rootObserver.dialogCount, 0);
     expect(nestedObserver.dialogCount, 1);
   });

   testWidgets("AboutListTile's child should not be offset when the icon is not specified.", (WidgetTester tester) async {
     await tester.pumpWidget(
       const MaterialApp(
         home: Scaffold(
           body: AboutListTile(
             child: Text('About'),
           ),
         ),
       ),
     );

     expect(
       find.descendant(
         of: find.byType(AboutListTile),
         matching: find.byType(Icon),
       ),
       findsNothing,
     );
   });

   testWidgets("AboutDialog's contents are scrollable", (WidgetTester tester) async {
     final Key contentKey = UniqueKey();
     await tester.pumpWidget(MaterialApp(
       home: Navigator(
         onGenerateRoute: (RouteSettings settings) {
           return MaterialPageRoute<dynamic>(
             builder: (BuildContext context) {
               return RaisedButton(
                 onPressed: () {
                   showAboutDialog(
                     context: context,
                     useRootNavigator: false,
                     applicationName: 'A',
                     children: <Widget>[
                       Container(
                         key: contentKey,
                         color: Colors.orange,
                         height: 500,
                       ),
                     ],
                   );
                 },
                 child: const Text('Show About Dialog'),
               );
             },
           );
         },
       ),
     ));

     await tester.tap(find.text('Show About Dialog'));
     await tester.pumpAndSettle();

     // Try dragging by the [AboutDialog]'s title.
     RenderBox box = tester.renderObject(find.text('A'));
     Offset originalOffset = box.localToGlobal(Offset.zero);
     await tester.drag(find.byKey(contentKey), const Offset(0.0, -20.0));

     expect(box.localToGlobal(Offset.zero), equals(originalOffset.translate(0.0, -20.0)));

     // Try dragging by the additional children in contents.
     box = tester.renderObject(find.byKey(contentKey));
     originalOffset = box.localToGlobal(Offset.zero);
     await tester.drag(find.byKey(contentKey), const Offset(0.0, -20.0));

     expect(box.localToGlobal(Offset.zero), equals(originalOffset.translate(0.0, -20.0)));
   });
 }

 class FakeLicenseEntry extends LicenseEntry {
   FakeLicenseEntry();

   bool get paragraphsCalled => _paragraphsCalled;
   bool _paragraphsCalled = false;

   @override
   Iterable<String> packages = <String>[];

   @override
   Iterable<LicenseParagraph> get paragraphs {
     _paragraphsCalled = true;
     return <LicenseParagraph>[];
   }
 }

 class LicensePageObserver extends NavigatorObserver {
   int licensePageCount = 0;

   @override
   void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
     if (route is MaterialPageRoute<dynamic>) {
       licensePageCount++;
     }
     super.didPush(route, previousRoute);
   }
 }

 class AboutDialogObserver extends NavigatorObserver {
   int dialogCount = 0;

   @override
   void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
     if (route.toString().contains('_DialogRoute')) {
       dialogCount++;
     }
     super.didPush(route, previousRoute);
   }
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'dart:async';

	import 'package:flutter/foundation.dart';
	import 'package:flutter/material.dart';
	import 'package:flutter_test/flutter_test.dart';

	void main() {
	tearDown(() {
	LicenseRegistry.reset();
	});

	testWidgets('AboutListTile control test', (WidgetTester tester) async {
	const FlutterLogo logo = FlutterLogo();

	await tester.pumpWidget(
	MaterialApp(
	title: 'Pirate app',
	home: Scaffold(
	appBar: AppBar(
	title: const Text('Home'),
	),
	drawer: Drawer(
	child: ListView(
	children: const <Widget>[
	AboutListTile(
	applicationVersion: '0.1.2',
	applicationIcon: logo,
	applicationLegalese: 'I am the very model of a modern major general.',
	aboutBoxChildren: <Widget>[
	Text('About box'),
	],
	),
	],
	),
	),
	),
	),
	);

	expect(find.text('About Pirate app'), findsNothing);
	expect(find.text('0.1.2'), findsNothing);
	expect(find.byWidget(logo), findsNothing);
	expect(
	find.text('I am the very model of a modern major general.'),
	findsNothing,
	);
	expect(find.text('About box'), findsNothing);

	await tester.tap(find.byType(IconButton));
	await tester.pumpAndSettle(const Duration(milliseconds: 100));

	expect(find.text('About Pirate app'), findsOneWidget);
	expect(find.text('0.1.2'), findsNothing);
	expect(find.byWidget(logo), findsNothing);
	expect(
	find.text('I am the very model of a modern major general.'),
	findsNothing,
	);
	expect(find.text('About box'), findsNothing);

	await tester.tap(find.text('About Pirate app'));
	await tester.pumpAndSettle(const Duration(milliseconds: 100));

	expect(find.text('About Pirate app'), findsOneWidget);
	expect(find.text('0.1.2'), findsOneWidget);
	expect(find.byWidget(logo), findsOneWidget);
	expect(
	find.text('I am the very model of a modern major general.'),
	findsOneWidget,
	);
	expect(find.text('About box'), findsOneWidget);

	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
	const LicenseEntryWithLineBreaks(<String>['Pirate package '], 'Pirate license'),
	]);
	});

	await tester.tap(find.text('VIEW LICENSES'));
	await tester.pumpAndSettle(const Duration(milliseconds: 100));

	expect(find.text('Pirate app'), findsOneWidget);
	expect(find.text('0.1.2'), findsOneWidget);
	expect(find.byWidget(logo), findsOneWidget);
	expect(
	find.text('I am the very model of a modern major general.'),
	findsOneWidget,
	);
	expect(find.text('Pirate license'), findsOneWidget);
	}, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

	testWidgets('About box logic defaults to executable name for app name', (WidgetTester tester) async {
	await tester.pumpWidget(
	const MaterialApp(
	title: 'flutter_tester',
	home: Material(child: AboutListTile()),
	),
	);
	expect(find.text('About flutter_tester'), findsOneWidget);
	});

	testWidgets('LicensePage control test', (WidgetTester tester) async {
	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
	const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
	]);
	});

	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
	const LicenseEntryWithLineBreaks(
	<String>['Another package'],
	'Another license',
	),
	]);
	});

	await tester.pumpWidget(
	const MaterialApp(
	home: Center(
	child: LicensePage(),
	),
	),
	);

	expect(find.text('AAA'), findsNothing);
	expect(find.text('BBB'), findsNothing);
	expect(find.text('Another package'), findsNothing);
	expect(find.text('Another license'), findsNothing);

	await tester.pumpAndSettle();

	expect(find.text('AAA'), findsOneWidget);
	expect(find.text('BBB'), findsOneWidget);
	expect(find.text('Another package'), findsOneWidget);
	expect(find.text('Another license'), findsOneWidget);
	}, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

	testWidgets('LicensePage control test with all properties', (WidgetTester tester) async {
	const FlutterLogo logo = FlutterLogo();

	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
	const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
	]);
	});

	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
	const LicenseEntryWithLineBreaks(
	<String>['Another package'],
	'Another license',
	),
	]);
	});

	await tester.pumpWidget(
	const MaterialApp(
	title: 'Pirate app',
	home: Center(
	child: LicensePage(
	applicationName: 'LicensePage test app',
	applicationVersion: '0.1.2',
	applicationIcon: logo,
	applicationLegalese: 'I am the very model of a modern major general.',
	),
	),
	),
	);

	expect(find.text('Pirate app'), findsNothing);
	expect(find.text('LicensePage test app'), findsOneWidget);
	expect(find.text('0.1.2'), findsOneWidget);
	expect(find.byWidget(logo), findsOneWidget);
	expect(
	find.text('I am the very model of a modern major general.'),
	findsOneWidget,
	);
	expect(find.text('AAA'), findsNothing);
	expect(find.text('BBB'), findsNothing);
	expect(find.text('Another package'), findsNothing);
	expect(find.text('Another license'), findsNothing);

	await tester.pumpAndSettle();

	expect(find.text('Pirate app'), findsNothing);
	expect(find.text('LicensePage test app'), findsOneWidget);
	expect(find.text('0.1.2'), findsOneWidget);
	expect(find.byWidget(logo), findsOneWidget);
	expect(
	find.text('I am the very model of a modern major general.'),
	findsOneWidget,
	);
	expect(find.text('AAA'), findsOneWidget);
	expect(find.text('BBB'), findsOneWidget);
	expect(find.text('Another package'), findsOneWidget);
	expect(find.text('Another license'), findsOneWidget);
	}, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

	testWidgets('LicensePage respects the notch', (WidgetTester tester) async {
	const double safeareaPadding = 27.0;

	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
	const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
	]);
	});

	await tester.pumpWidget(
	const MaterialApp(
	home: MediaQuery(
	data: MediaQueryData(
	padding: EdgeInsets.all(safeareaPadding),
	),
	child: LicensePage(),
	),
	),
	);

	await tester.pumpAndSettle();

	expect(tester.getTopLeft(find.text('DEF')), const Offset(8.0 + safeareaPadding, 287.0));
	}, skip: isBrowser); // https://github.com/flutter/flutter/issues/54385

	testWidgets('LicensePage returns early if unmounted', (WidgetTester tester) async {
	final Completer<LicenseEntry> licenseCompleter = Completer<LicenseEntry>();
	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromFuture(licenseCompleter.future);
	});

	await tester.pumpWidget(
	const MaterialApp(
	home: LicensePage(),
	),
	);
	await tester.pump();

	await tester.pumpWidget(
	const MaterialApp(
	home: Placeholder(),
	),
	);

	await tester.pumpAndSettle();
	final FakeLicenseEntry licenseEntry = FakeLicenseEntry();
	licenseCompleter.complete(licenseEntry);
	expect(licenseEntry.paragraphsCalled, false);
	});

	testWidgets('LicensePage returns late if unmounted', (WidgetTester tester) async {
	final Completer<LicenseEntry> licenseCompleter = Completer<LicenseEntry>();
	LicenseRegistry.addLicense(() {
	return Stream<LicenseEntry>.fromFuture(licenseCompleter.future);
	});

	await tester.pumpWidget(
	const MaterialApp(
	home: LicensePage(),
	),
	);
	await tester.pump();
	final FakeLicenseEntry licenseEntry = FakeLicenseEntry();
	licenseCompleter.complete(licenseEntry);

	await tester.pumpWidget(
	const MaterialApp(
	home: Placeholder(),
	),
	);

	await tester.pumpAndSettle();
	expect(licenseEntry.paragraphsCalled, true);
	});

	testWidgets('LicensePage logic defaults to executable name for app name', (WidgetTester tester) async {
	await tester.pumpWidget(
	const MaterialApp(
	title: 'flutter_tester',
	home: Material(child: LicensePage()),
	),
	);
	expect(find.text('flutter_tester'), findsOneWidget);
	});

	testWidgets('AboutListTile dense property is applied', (WidgetTester tester) async {
	await tester.pumpWidget(const MaterialApp(
	home: Material(child: Center(child: AboutListTile())),
	));
	Rect tileRect = tester.getRect(find.byType(AboutListTile));
	expect(tileRect.height, 56.0);

	await tester.pumpWidget(const MaterialApp(
	home: Material(child: Center(child: AboutListTile(dense: false))),
	));
	tileRect = tester.getRect(find.byType(AboutListTile));
	expect(tileRect.height, 56.0);

	await tester.pumpWidget(const MaterialApp(
	home: Material(child: Center(child: AboutListTile(dense: true))),
	));
	tileRect = tester.getRect(find.byType(AboutListTile));
	expect(tileRect.height, 48.0);
	});

	testWidgets('showLicensePage uses nested navigator by default', (WidgetTester tester) async {
	final LicensePageObserver rootObserver = LicensePageObserver();
	final LicensePageObserver nestedObserver = LicensePageObserver();

	await tester.pumpWidget(MaterialApp(
	navigatorObservers: <NavigatorObserver>[rootObserver],
	initialRoute: '/',
	onGenerateRoute: (_) {
	return PageRouteBuilder<dynamic>(
	pageBuilder: (_, __, ___) => Navigator(
	observers: <NavigatorObserver>[nestedObserver],
	onGenerateRoute: (RouteSettings settings) {
	return PageRouteBuilder<dynamic>(
	pageBuilder: (BuildContext context, _, __) {
	return RaisedButton(
	onPressed: () {
	showLicensePage(
	context: context,
	applicationName: 'A',
	);
	},
	child: const Text('Show License Page'),
	);
	},
	);
	},
	),
	);
	},
	));

	// Open the dialog.
	await tester.tap(find.byType(RaisedButton));

	expect(rootObserver.licensePageCount, 0);
	expect(nestedObserver.licensePageCount, 1);
	});

	testWidgets('showLicensePage uses root navigator if useRootNavigator is true', (WidgetTester tester) async {
	final LicensePageObserver rootObserver = LicensePageObserver();
	final LicensePageObserver nestedObserver = LicensePageObserver();

	await tester.pumpWidget(MaterialApp(
	navigatorObservers: <NavigatorObserver>[rootObserver],
	initialRoute: '/',
	onGenerateRoute: (_) {
	return PageRouteBuilder<dynamic>(
	pageBuilder: (_, __, ___) => Navigator(
	observers: <NavigatorObserver>[nestedObserver],
	onGenerateRoute: (RouteSettings settings) {
	return PageRouteBuilder<dynamic>(
	pageBuilder: (BuildContext context, _, __) {
	return RaisedButton(
	onPressed: () {
	showLicensePage(
	context: context,
	useRootNavigator: true,
	applicationName: 'A',
	);
	},
	child: const Text('Show License Page'),
	);
	},
	);
	},
	),
	);
	},
	));

	// Open the dialog.
	await tester.tap(find.byType(RaisedButton));

	expect(rootObserver.licensePageCount, 1);
	expect(nestedObserver.licensePageCount, 0);
	});

	testWidgets('showAboutDialog uses root navigator by default', (WidgetTester tester) async {
	final AboutDialogObserver rootObserver = AboutDialogObserver();
	final AboutDialogObserver nestedObserver = AboutDialogObserver();

	await tester.pumpWidget(MaterialApp(
	navigatorObservers: <NavigatorObserver>[rootObserver],
	home: Navigator(
	observers: <NavigatorObserver>[nestedObserver],
	onGenerateRoute: (RouteSettings settings) {
	return MaterialPageRoute<dynamic>(
	builder: (BuildContext context) {
	return RaisedButton(
	onPressed: () {
	showAboutDialog(
	context: context,
	applicationName: 'A',
	);
	},
	child: const Text('Show About Dialog'),
	);
	},
	);
	},
	),
	));

	// Open the dialog.
	await tester.tap(find.byType(RaisedButton));

	expect(rootObserver.dialogCount, 1);
	expect(nestedObserver.dialogCount, 0);
	});

	testWidgets('showAboutDialog uses nested navigator if useRootNavigator is false', (WidgetTester tester) async {
	final AboutDialogObserver rootObserver = AboutDialogObserver();
	final AboutDialogObserver nestedObserver = AboutDialogObserver();

	await tester.pumpWidget(MaterialApp(
	navigatorObservers: <NavigatorObserver>[rootObserver],
	home: Navigator(
	observers: <NavigatorObserver>[nestedObserver],
	onGenerateRoute: (RouteSettings settings) {
	return MaterialPageRoute<dynamic>(
	builder: (BuildContext context) {
	return RaisedButton(
	onPressed: () {
	showAboutDialog(
	context: context,
	useRootNavigator: false,
	applicationName: 'A',
	);
	},
	child: const Text('Show About Dialog'),
	);
	},
	);
	},
	),
	));

	// Open the dialog.
	await tester.tap(find.byType(RaisedButton));

	expect(rootObserver.dialogCount, 0);
	expect(nestedObserver.dialogCount, 1);
	});

	testWidgets("AboutListTile's child should not be offset when the icon is not specified.", (WidgetTester tester) async {
	await tester.pumpWidget(
	const MaterialApp(
	home: Scaffold(
	body: AboutListTile(
	child: Text('About'),
	),
	),
	),
	);

	expect(
	find.descendant(
	of: find.byType(AboutListTile),
	matching: find.byType(Icon),
	),
	findsNothing,
	);
	});

	testWidgets("AboutDialog's contents are scrollable", (WidgetTester tester) async {
	final Key contentKey = UniqueKey();
	await tester.pumpWidget(MaterialApp(
	home: Navigator(
	onGenerateRoute: (RouteSettings settings) {
	return MaterialPageRoute<dynamic>(
	builder: (BuildContext context) {
	return RaisedButton(
	onPressed: () {
	showAboutDialog(
	context: context,
	useRootNavigator: false,
	applicationName: 'A',
	children: <Widget>[
	Container(
	key: contentKey,
	color: Colors.orange,
	height: 500,
	),
	],
	);
	},
	child: const Text('Show About Dialog'),
	);
	},
	);
	},
	),
	));

	await tester.tap(find.text('Show About Dialog'));
	await tester.pumpAndSettle();

	// Try dragging by the [AboutDialog]'s title.
	RenderBox box = tester.renderObject(find.text('A'));
	Offset originalOffset = box.localToGlobal(Offset.zero);
	await tester.drag(find.byKey(contentKey), const Offset(0.0, -20.0));

	expect(box.localToGlobal(Offset.zero), equals(originalOffset.translate(0.0, -20.0)));

	// Try dragging by the additional children in contents.
	box = tester.renderObject(find.byKey(contentKey));
	originalOffset = box.localToGlobal(Offset.zero);
	await tester.drag(find.byKey(contentKey), const Offset(0.0, -20.0));

	expect(box.localToGlobal(Offset.zero), equals(originalOffset.translate(0.0, -20.0)));
	});
	}

	class FakeLicenseEntry extends LicenseEntry {
	FakeLicenseEntry();

	bool get paragraphsCalled => _paragraphsCalled;
	bool _paragraphsCalled = false;

	@override
	Iterable<String> packages = <String>[];

	@override
	Iterable<LicenseParagraph> get paragraphs {
	_paragraphsCalled = true;
	return <LicenseParagraph>[];
	}
	}

	class LicensePageObserver extends NavigatorObserver {
	int licensePageCount = 0;

	@override
	void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
	if (route is MaterialPageRoute<dynamic>) {
	licensePageCount++;
	}
	super.didPush(route, previousRoute);
	}
	}

	class AboutDialogObserver extends NavigatorObserver {
	int dialogCount = 0;

	@override
	void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
	if (route.toString().contains('_DialogRoute')) {
	dialogCount++;
	}
	super.didPush(route, previousRoute);
	}
	}