packages/flutter/test/material/navigation_bar_theme_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.

 // This file is run as part of a reduced test set in CI on Mac and Windows
 // machines.
 @Tags(<String>['reduced-test-set'])
 library;

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

 void main() {
   test('copyWith, ==, hashCode basics', () {
     expect(const NavigationBarThemeData(), const NavigationBarThemeData().copyWith());
     expect(const NavigationBarThemeData().hashCode, const NavigationBarThemeData().copyWith().hashCode);
   });

   test('NavigationBarThemeData lerp special cases', () {
     expect(NavigationBarThemeData.lerp(null, null, 0), null);
     const NavigationBarThemeData data = NavigationBarThemeData();
     expect(identical(NavigationBarThemeData.lerp(data, data, 0.5), data), true);
   });

   testWidgets('Default debugFillProperties', (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
     const NavigationBarThemeData().debugFillProperties(builder);

     final List<String> description = builder.properties
         .where((DiagnosticsNode node) => !node.isFiltered(DiagnosticLevel.info))
         .map((DiagnosticsNode node) => node.toString())
         .toList();

     expect(description, <String>[]);
   });

   testWidgets('Custom debugFillProperties', (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
     const NavigationBarThemeData(
       height: 200.0,
       backgroundColor: Color(0x00000099),
       elevation: 20.0,
       indicatorColor: Color(0x00000098),
       indicatorShape: CircleBorder(),
       labelTextStyle: MaterialStatePropertyAll<TextStyle>(TextStyle(fontSize: 7.0)),
       iconTheme: MaterialStatePropertyAll<IconThemeData>(IconThemeData(color: Color(0x00000097))),
       labelBehavior: NavigationDestinationLabelBehavior.alwaysHide,
       overlayColor: MaterialStatePropertyAll<Color>(Color(0x00000096)),
     ).debugFillProperties(builder);

     final List<String> description = builder.properties
         .where((DiagnosticsNode node) => !node.isFiltered(DiagnosticLevel.info))
         .map((DiagnosticsNode node) => node.toString())
         .toList();

     expect(description[0], 'height: 200.0');
     expect(description[1], 'backgroundColor: Color(0x00000099)');
     expect(description[2], 'elevation: 20.0');
     expect(description[3], 'indicatorColor: Color(0x00000098)');
     expect(description[4], 'indicatorShape: CircleBorder(BorderSide(width: 0.0, style: none))');
     expect(description[5], 'labelTextStyle: WidgetStatePropertyAll(TextStyle(inherit: true, size: 7.0))');
     // Ignore instance address for IconThemeData.
     expect(description[6].contains('iconTheme: WidgetStatePropertyAll(IconThemeData'), isTrue);
     expect(description[6].contains('(color: Color(0x00000097))'), isTrue);
     expect(description[7], 'labelBehavior: NavigationDestinationLabelBehavior.alwaysHide');
     expect(description[8], 'overlayColor: WidgetStatePropertyAll(Color(0x00000096))');
   });

   testWidgets('NavigationBarThemeData values are used when no NavigationBar properties are specified', (WidgetTester tester) async {
     const double height = 200.0;
     const Color backgroundColor = Color(0x00000001);
     const double elevation = 42.0;
     const Color indicatorColor = Color(0x00000002);
     const ShapeBorder indicatorShape = CircleBorder();
     const double selectedIconSize = 25.0;
     const double unselectedIconSize = 23.0;
     const Color selectedIconColor = Color(0x00000003);
     const Color unselectedIconColor = Color(0x00000004);
     const double selectedIconOpacity = 0.99;
     const double unselectedIconOpacity = 0.98;
     const double selectedLabelFontSize = 13.0;
     const double unselectedLabelFontSize = 11.0;
     const NavigationDestinationLabelBehavior labelBehavior = NavigationDestinationLabelBehavior.alwaysShow;

     await tester.pumpWidget(
       MaterialApp(
         home: Scaffold(
           bottomNavigationBar: NavigationBarTheme(
             data: NavigationBarThemeData(
               height: height,
               backgroundColor: backgroundColor,
               elevation: elevation,
               indicatorColor: indicatorColor,
               indicatorShape: indicatorShape,
               iconTheme: MaterialStateProperty.resolveWith((Set<MaterialState> states) {
                 if (states.contains(MaterialState.selected)) {
                   return const IconThemeData(
                     size: selectedIconSize,
                     color: selectedIconColor,
                     opacity: selectedIconOpacity,
                   );
                 }
                 return const IconThemeData(
                   size: unselectedIconSize,
                   color: unselectedIconColor,
                   opacity: unselectedIconOpacity,
                 );
               }),
               labelTextStyle: MaterialStateProperty.resolveWith((Set<MaterialState> states) {
                 if (states.contains(MaterialState.selected)) {
                   return const TextStyle(fontSize: selectedLabelFontSize);
                 }
                 return const TextStyle(fontSize: unselectedLabelFontSize);
               }),
               labelBehavior: labelBehavior,
             ),
             child: NavigationBar(
               destinations: _destinations(),
             ),
           ),
         ),
       ),
     );

     expect(_barHeight(tester), height);
     expect(_barMaterial(tester).color, backgroundColor);
     expect(_barMaterial(tester).elevation, elevation);
     expect(_indicator(tester)?.color, indicatorColor);
     expect(_indicator(tester)?.shape, indicatorShape);
     expect(_selectedIconTheme(tester).size, selectedIconSize);
     expect(_selectedIconTheme(tester).color, selectedIconColor);
     expect(_selectedIconTheme(tester).opacity, selectedIconOpacity);
     expect(_unselectedIconTheme(tester).size, unselectedIconSize);
     expect(_unselectedIconTheme(tester).color, unselectedIconColor);
     expect(_unselectedIconTheme(tester).opacity, unselectedIconOpacity);
     expect(_selectedLabelStyle(tester).fontSize, selectedLabelFontSize);
     expect(_unselectedLabelStyle(tester).fontSize, unselectedLabelFontSize);
     expect(_labelBehavior(tester), labelBehavior);
   });

   testWidgets('NavigationBar values take priority over NavigationBarThemeData values when both properties are specified', (WidgetTester tester) async {
     const double height = 200.0;
     const Color backgroundColor = Color(0x00000001);
     const double elevation = 42.0;
     const NavigationDestinationLabelBehavior labelBehavior = NavigationDestinationLabelBehavior.alwaysShow;

     await tester.pumpWidget(
       MaterialApp(
         home: Scaffold(
           bottomNavigationBar: NavigationBarTheme(
             data: const NavigationBarThemeData(
               height: 100.0,
               elevation: 18.0,
               backgroundColor: Color(0x00000099),
               labelBehavior: NavigationDestinationLabelBehavior.alwaysHide,
             ),
             child: NavigationBar(
               height: height,
               elevation: elevation,
               backgroundColor: backgroundColor,
               labelBehavior: labelBehavior,
               destinations: _destinations(),
             ),
           ),
         ),
       ),
     );

     expect(_barHeight(tester), height);
     expect(_barMaterial(tester).color, backgroundColor);
     expect(_barMaterial(tester).elevation, elevation);
     expect(_labelBehavior(tester), labelBehavior);
   });

   testWidgets('Custom label style renders ink ripple properly', (WidgetTester tester) async {
     Widget buildWidget({ NavigationDestinationLabelBehavior? labelBehavior }) {
       return MaterialApp(
         theme: ThemeData(
           navigationBarTheme: const NavigationBarThemeData(
             labelTextStyle: MaterialStatePropertyAll<TextStyle>(
               TextStyle(fontSize: 25, color: Color(0xff0000ff)),
             ),
           ),
           useMaterial3: true,
         ),
         home: Scaffold(
           bottomNavigationBar: Center(
             child: NavigationBar(
               labelBehavior: labelBehavior,
               destinations: const <Widget>[
                 NavigationDestination(
                   icon: SizedBox(),
                   label: 'AC',
                 ),
                 NavigationDestination(
                   icon: SizedBox(),
                   label: 'Alarm',
                 ),
               ],
               onDestinationSelected: (int i) { },
             ),
           ),
         ),
       );
     }

     await tester.pumpWidget(buildWidget());

     final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
     await gesture.addPointer();
     await gesture.moveTo(tester.getCenter(find.byType(NavigationDestination).last));
     await tester.pumpAndSettle();

     await expectLater(find.byType(NavigationBar), matchesGoldenFile('indicator_custom_label_style.png'));
   });

   testWidgets('NavigationBar respects NavigationBarTheme.overlayColor in active/pressed/hovered states', (WidgetTester tester) async {
     tester.binding.focusManager.highlightStrategy = FocusHighlightStrategy.alwaysTraditional;
     const Color hoverColor = Color(0xff0000ff);
     const Color focusColor = Color(0xff00ffff);
     const Color pressedColor = Color(0xffff00ff);
     final MaterialStateProperty<Color?> overlayColor = MaterialStateProperty.resolveWith<Color>(
       (Set<MaterialState> states) {
         if (states.contains(MaterialState.hovered)) {
           return hoverColor;
         }
         if (states.contains(MaterialState.focused)) {
           return focusColor;
         }
         if (states.contains(MaterialState.pressed)) {
           return pressedColor;
         }
         return Colors.transparent;
     });

     await tester.pumpWidget(MaterialApp(
       theme: ThemeData(navigationBarTheme: NavigationBarThemeData(overlayColor: overlayColor)),
       home: Scaffold(
         bottomNavigationBar: RepaintBoundary(
           child: NavigationBar(
             destinations: const <Widget>[
               NavigationDestination(
                 icon: Icon(Icons.ac_unit),
                 label: 'AC',
               ),
               NavigationDestination(
                 icon: Icon(Icons.access_alarm),
                 label: 'Alarm',
               ),
             ],
             onDestinationSelected: (int i) { },
           ),
         ),
       ),
     ));

     final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
     await gesture.addPointer();
     await gesture.moveTo(tester.getCenter(find.byType(NavigationIndicator).last));
     await tester.pumpAndSettle();

     final RenderObject inkFeatures = tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');

     // Test hovered state.
     expect(
       inkFeatures,
       kIsWeb
         ? (paints..rrect()..rrect()..circle(color: hoverColor))
         : (paints..circle(color: hoverColor)),
     );

     await gesture.down(tester.getCenter(find.byType(NavigationIndicator).last));
     await tester.pumpAndSettle();

     // Test pressed state.
     expect(
       inkFeatures,
       kIsWeb
         ? (paints..circle()..circle()..circle(color: pressedColor))
         : (paints..circle()..circle(color: pressedColor)),
     );

     await gesture.up();
     await tester.pumpAndSettle();

     // Press tab to focus the navigation bar.
     await tester.sendKeyEvent(LogicalKeyboardKey.tab);
     await tester.pumpAndSettle();

     // Test focused state.
     expect(
       inkFeatures,
       kIsWeb ? (paints..circle()..circle(color: focusColor)) : (paints..circle()..circle(color: focusColor)),
     );
   });
 }

 List<NavigationDestination> _destinations() {
   return const <NavigationDestination>[
     NavigationDestination(
       icon: Icon(Icons.favorite_border),
       selectedIcon: Icon(Icons.favorite),
       label: 'Abc',
     ),
     NavigationDestination(
       icon: Icon(Icons.star_border),
       selectedIcon: Icon(Icons.star),
       label: 'Def',
     ),
   ];
 }

 double _barHeight(WidgetTester tester) {
   return tester.getRect(
     find.byType(NavigationBar),
   ).height;
 }

 Material _barMaterial(WidgetTester tester) {
   return tester.firstWidget<Material>(
     find.descendant(
       of: find.byType(NavigationBar),
       matching: find.byType(Material),
     ),
   );
 }

 ShapeDecoration? _indicator(WidgetTester tester) {
   return tester.firstWidget<Container>(
     find.descendant(
       of: find.byType(FadeTransition),
       matching: find.byType(Container),
     ),
   ).decoration as ShapeDecoration?;
 }

 IconThemeData _selectedIconTheme(WidgetTester tester) {
   return _iconTheme(tester, Icons.favorite);
 }

 IconThemeData _unselectedIconTheme(WidgetTester tester) {
   return _iconTheme(tester, Icons.star_border);
 }

 IconThemeData _iconTheme(WidgetTester tester, IconData icon) {
   return tester.firstWidget<IconTheme>(
     find.ancestor(
       of: find.byIcon(icon),
       matching: find.byType(IconTheme),
     ),
   ).data;
 }

 TextStyle _selectedLabelStyle(WidgetTester tester) {
   return tester.widget<RichText>(
     find.descendant(
       of: find.text('Abc'),
       matching: find.byType(RichText),
     ),
   ).text.style!;
 }

 TextStyle _unselectedLabelStyle(WidgetTester tester) {
   return tester.widget<RichText>(
     find.descendant(
       of: find.text('Def'),
       matching: find.byType(RichText),
     ),
   ).text.style!;
 }

 NavigationDestinationLabelBehavior _labelBehavior(WidgetTester tester) {
   if (_opacityAboveLabel('Abc').evaluate().isNotEmpty && _opacityAboveLabel('Def').evaluate().isNotEmpty) {
     return _labelOpacity(tester, 'Abc') == 1
         ? NavigationDestinationLabelBehavior.onlyShowSelected
         : NavigationDestinationLabelBehavior.alwaysHide;
   } else {
     return NavigationDestinationLabelBehavior.alwaysShow;
   }
 }

 Finder _opacityAboveLabel(String text) {
   return find.ancestor(
     of: find.text(text),
     matching: find.byType(Opacity),
   );
 }

 // Only valid when labelBehavior != alwaysShow.
 double _labelOpacity(WidgetTester tester, String text) {
   final Opacity opacityWidget = tester.widget<Opacity>(
     find.ancestor(
       of: find.text(text),
       matching: find.byType(Opacity),
     ),
   );
   return opacityWidget.opacity;
 }
	// 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.

	// This file is run as part of a reduced test set in CI on Mac and Windows
	// machines.
	@Tags(<String>['reduced-test-set'])
	library;

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

	void main() {
	test('copyWith, ==, hashCode basics', () {
	expect(const NavigationBarThemeData(), const NavigationBarThemeData().copyWith());
	expect(const NavigationBarThemeData().hashCode, const NavigationBarThemeData().copyWith().hashCode);
	});

	test('NavigationBarThemeData lerp special cases', () {
	expect(NavigationBarThemeData.lerp(null, null, 0), null);
	const NavigationBarThemeData data = NavigationBarThemeData();
	expect(identical(NavigationBarThemeData.lerp(data, data, 0.5), data), true);
	});

	testWidgets('Default debugFillProperties', (WidgetTester tester) async {
	final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
	const NavigationBarThemeData().debugFillProperties(builder);

	final List<String> description = builder.properties
	.where((DiagnosticsNode node) => !node.isFiltered(DiagnosticLevel.info))
	.map((DiagnosticsNode node) => node.toString())
	.toList();

	expect(description, <String>[]);
	});

	testWidgets('Custom debugFillProperties', (WidgetTester tester) async {
	final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
	const NavigationBarThemeData(
	height: 200.0,
	backgroundColor: Color(0x00000099),
	elevation: 20.0,
	indicatorColor: Color(0x00000098),
	indicatorShape: CircleBorder(),
	labelTextStyle: MaterialStatePropertyAll<TextStyle>(TextStyle(fontSize: 7.0)),
	iconTheme: MaterialStatePropertyAll<IconThemeData>(IconThemeData(color: Color(0x00000097))),
	labelBehavior: NavigationDestinationLabelBehavior.alwaysHide,
	overlayColor: MaterialStatePropertyAll<Color>(Color(0x00000096)),
	).debugFillProperties(builder);

	final List<String> description = builder.properties
	.where((DiagnosticsNode node) => !node.isFiltered(DiagnosticLevel.info))
	.map((DiagnosticsNode node) => node.toString())
	.toList();

	expect(description[0], 'height: 200.0');
	expect(description[1], 'backgroundColor: Color(0x00000099)');
	expect(description[2], 'elevation: 20.0');
	expect(description[3], 'indicatorColor: Color(0x00000098)');
	expect(description[4], 'indicatorShape: CircleBorder(BorderSide(width: 0.0, style: none))');
	expect(description[5], 'labelTextStyle: WidgetStatePropertyAll(TextStyle(inherit: true, size: 7.0))');
	// Ignore instance address for IconThemeData.
	expect(description[6].contains('iconTheme: WidgetStatePropertyAll(IconThemeData'), isTrue);
	expect(description[6].contains('(color: Color(0x00000097))'), isTrue);
	expect(description[7], 'labelBehavior: NavigationDestinationLabelBehavior.alwaysHide');
	expect(description[8], 'overlayColor: WidgetStatePropertyAll(Color(0x00000096))');
	});

	testWidgets('NavigationBarThemeData values are used when no NavigationBar properties are specified', (WidgetTester tester) async {
	const double height = 200.0;
	const Color backgroundColor = Color(0x00000001);
	const double elevation = 42.0;
	const Color indicatorColor = Color(0x00000002);
	const ShapeBorder indicatorShape = CircleBorder();
	const double selectedIconSize = 25.0;
	const double unselectedIconSize = 23.0;
	const Color selectedIconColor = Color(0x00000003);
	const Color unselectedIconColor = Color(0x00000004);
	const double selectedIconOpacity = 0.99;
	const double unselectedIconOpacity = 0.98;
	const double selectedLabelFontSize = 13.0;
	const double unselectedLabelFontSize = 11.0;
	const NavigationDestinationLabelBehavior labelBehavior = NavigationDestinationLabelBehavior.alwaysShow;

	await tester.pumpWidget(
	MaterialApp(
	home: Scaffold(
	bottomNavigationBar: NavigationBarTheme(
	data: NavigationBarThemeData(
	height: height,
	backgroundColor: backgroundColor,
	elevation: elevation,
	indicatorColor: indicatorColor,
	indicatorShape: indicatorShape,
	iconTheme: MaterialStateProperty.resolveWith((Set<MaterialState> states) {
	if (states.contains(MaterialState.selected)) {
	return const IconThemeData(
	size: selectedIconSize,
	color: selectedIconColor,
	opacity: selectedIconOpacity,
	);
	}
	return const IconThemeData(
	size: unselectedIconSize,
	color: unselectedIconColor,
	opacity: unselectedIconOpacity,
	);
	}),
	labelTextStyle: MaterialStateProperty.resolveWith((Set<MaterialState> states) {
	if (states.contains(MaterialState.selected)) {
	return const TextStyle(fontSize: selectedLabelFontSize);
	}
	return const TextStyle(fontSize: unselectedLabelFontSize);
	}),
	labelBehavior: labelBehavior,
	),
	child: NavigationBar(
	destinations: _destinations(),
	),
	),
	),
	),
	);

	expect(_barHeight(tester), height);
	expect(_barMaterial(tester).color, backgroundColor);
	expect(_barMaterial(tester).elevation, elevation);
	expect(_indicator(tester)?.color, indicatorColor);
	expect(_indicator(tester)?.shape, indicatorShape);
	expect(_selectedIconTheme(tester).size, selectedIconSize);
	expect(_selectedIconTheme(tester).color, selectedIconColor);
	expect(_selectedIconTheme(tester).opacity, selectedIconOpacity);
	expect(_unselectedIconTheme(tester).size, unselectedIconSize);
	expect(_unselectedIconTheme(tester).color, unselectedIconColor);
	expect(_unselectedIconTheme(tester).opacity, unselectedIconOpacity);
	expect(_selectedLabelStyle(tester).fontSize, selectedLabelFontSize);
	expect(_unselectedLabelStyle(tester).fontSize, unselectedLabelFontSize);
	expect(_labelBehavior(tester), labelBehavior);
	});

	testWidgets('NavigationBar values take priority over NavigationBarThemeData values when both properties are specified', (WidgetTester tester) async {
	const double height = 200.0;
	const Color backgroundColor = Color(0x00000001);
	const double elevation = 42.0;
	const NavigationDestinationLabelBehavior labelBehavior = NavigationDestinationLabelBehavior.alwaysShow;

	await tester.pumpWidget(
	MaterialApp(
	home: Scaffold(
	bottomNavigationBar: NavigationBarTheme(
	data: const NavigationBarThemeData(
	height: 100.0,
	elevation: 18.0,
	backgroundColor: Color(0x00000099),
	labelBehavior: NavigationDestinationLabelBehavior.alwaysHide,
	),
	child: NavigationBar(
	height: height,
	elevation: elevation,
	backgroundColor: backgroundColor,
	labelBehavior: labelBehavior,
	destinations: _destinations(),
	),
	),
	),
	),
	);

	expect(_barHeight(tester), height);
	expect(_barMaterial(tester).color, backgroundColor);
	expect(_barMaterial(tester).elevation, elevation);
	expect(_labelBehavior(tester), labelBehavior);
	});

	testWidgets('Custom label style renders ink ripple properly', (WidgetTester tester) async {
	Widget buildWidget({ NavigationDestinationLabelBehavior? labelBehavior }) {
	return MaterialApp(
	theme: ThemeData(
	navigationBarTheme: const NavigationBarThemeData(
	labelTextStyle: MaterialStatePropertyAll<TextStyle>(
	TextStyle(fontSize: 25, color: Color(0xff0000ff)),
	),
	),
	useMaterial3: true,
	),
	home: Scaffold(
	bottomNavigationBar: Center(
	child: NavigationBar(
	labelBehavior: labelBehavior,
	destinations: const <Widget>[
	NavigationDestination(
	icon: SizedBox(),
	label: 'AC',
	),
	NavigationDestination(
	icon: SizedBox(),
	label: 'Alarm',
	),
	],
	onDestinationSelected: (int i) { },
	),
	),
	),
	);
	}

	await tester.pumpWidget(buildWidget());

	final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
	await gesture.addPointer();
	await gesture.moveTo(tester.getCenter(find.byType(NavigationDestination).last));
	await tester.pumpAndSettle();

	await expectLater(find.byType(NavigationBar), matchesGoldenFile('indicator_custom_label_style.png'));
	});

	testWidgets('NavigationBar respects NavigationBarTheme.overlayColor in active/pressed/hovered states', (WidgetTester tester) async {
	tester.binding.focusManager.highlightStrategy = FocusHighlightStrategy.alwaysTraditional;
	const Color hoverColor = Color(0xff0000ff);
	const Color focusColor = Color(0xff00ffff);
	const Color pressedColor = Color(0xffff00ff);
	final MaterialStateProperty<Color?> overlayColor = MaterialStateProperty.resolveWith<Color>(
	(Set<MaterialState> states) {
	if (states.contains(MaterialState.hovered)) {
	return hoverColor;
	}
	if (states.contains(MaterialState.focused)) {
	return focusColor;
	}
	if (states.contains(MaterialState.pressed)) {
	return pressedColor;
	}
	return Colors.transparent;
	});

	await tester.pumpWidget(MaterialApp(
	theme: ThemeData(navigationBarTheme: NavigationBarThemeData(overlayColor: overlayColor)),
	home: Scaffold(
	bottomNavigationBar: RepaintBoundary(
	child: NavigationBar(
	destinations: const <Widget>[
	NavigationDestination(
	icon: Icon(Icons.ac_unit),
	label: 'AC',
	),
	NavigationDestination(
	icon: Icon(Icons.access_alarm),
	label: 'Alarm',
	),
	],
	onDestinationSelected: (int i) { },
	),
	),
	),
	));

	final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
	await gesture.addPointer();
	await gesture.moveTo(tester.getCenter(find.byType(NavigationIndicator).last));
	await tester.pumpAndSettle();

	final RenderObject inkFeatures = tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');

	// Test hovered state.
	expect(
	inkFeatures,
	kIsWeb
	? (paints..rrect()..rrect()..circle(color: hoverColor))
	: (paints..circle(color: hoverColor)),
	);

	await gesture.down(tester.getCenter(find.byType(NavigationIndicator).last));
	await tester.pumpAndSettle();

	// Test pressed state.
	expect(
	inkFeatures,
	kIsWeb
	? (paints..circle()..circle()..circle(color: pressedColor))
	: (paints..circle()..circle(color: pressedColor)),
	);

	await gesture.up();
	await tester.pumpAndSettle();

	// Press tab to focus the navigation bar.
	await tester.sendKeyEvent(LogicalKeyboardKey.tab);
	await tester.pumpAndSettle();

	// Test focused state.
	expect(
	inkFeatures,
	kIsWeb ? (paints..circle()..circle(color: focusColor)) : (paints..circle()..circle(color: focusColor)),
	);
	});
	}

	List<NavigationDestination> _destinations() {
	return const <NavigationDestination>[
	NavigationDestination(
	icon: Icon(Icons.favorite_border),
	selectedIcon: Icon(Icons.favorite),
	label: 'Abc',
	),
	NavigationDestination(
	icon: Icon(Icons.star_border),
	selectedIcon: Icon(Icons.star),
	label: 'Def',
	),
	];
	}

	double _barHeight(WidgetTester tester) {
	return tester.getRect(
	find.byType(NavigationBar),
	).height;
	}

	Material _barMaterial(WidgetTester tester) {
	return tester.firstWidget<Material>(
	find.descendant(
	of: find.byType(NavigationBar),
	matching: find.byType(Material),
	),
	);
	}

	ShapeDecoration? _indicator(WidgetTester tester) {
	return tester.firstWidget<Container>(
	find.descendant(
	of: find.byType(FadeTransition),
	matching: find.byType(Container),
	),
	).decoration as ShapeDecoration?;
	}

	IconThemeData _selectedIconTheme(WidgetTester tester) {
	return _iconTheme(tester, Icons.favorite);
	}

	IconThemeData _unselectedIconTheme(WidgetTester tester) {
	return _iconTheme(tester, Icons.star_border);
	}

	IconThemeData _iconTheme(WidgetTester tester, IconData icon) {
	return tester.firstWidget<IconTheme>(
	find.ancestor(
	of: find.byIcon(icon),
	matching: find.byType(IconTheme),
	),
	).data;
	}

	TextStyle _selectedLabelStyle(WidgetTester tester) {
	return tester.widget<RichText>(
	find.descendant(
	of: find.text('Abc'),
	matching: find.byType(RichText),
	),
	).text.style!;
	}

	TextStyle _unselectedLabelStyle(WidgetTester tester) {
	return tester.widget<RichText>(
	find.descendant(
	of: find.text('Def'),
	matching: find.byType(RichText),
	),
	).text.style!;
	}

	NavigationDestinationLabelBehavior _labelBehavior(WidgetTester tester) {
	if (_opacityAboveLabel('Abc').evaluate().isNotEmpty && _opacityAboveLabel('Def').evaluate().isNotEmpty) {
	return _labelOpacity(tester, 'Abc') == 1
	? NavigationDestinationLabelBehavior.onlyShowSelected
	: NavigationDestinationLabelBehavior.alwaysHide;
	} else {
	return NavigationDestinationLabelBehavior.alwaysShow;
	}
	}

	Finder _opacityAboveLabel(String text) {
	return find.ancestor(
	of: find.text(text),
	matching: find.byType(Opacity),
	);
	}

	// Only valid when labelBehavior != alwaysShow.
	double _labelOpacity(WidgetTester tester, String text) {
	final Opacity opacityWidget = tester.widget<Opacity>(
	find.ancestor(
	of: find.text(text),
	matching: find.byType(Opacity),
	),
	);
	return opacityWidget.opacity;
	}