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

import '../widgets/semantics_tester.dart';

void main() {
  testWidgets('Custom selected and unselected textStyles are honored', (WidgetTester tester) async {
    const TextStyle selectedTextStyle = TextStyle(fontWeight: FontWeight.w300, fontSize: 17.0);
    const TextStyle unselectedTextStyle = TextStyle(fontWeight: FontWeight.w800, fontSize: 11.0);

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
        selectedLabelTextStyle: selectedTextStyle,
        unselectedLabelTextStyle: unselectedTextStyle,
      ),
    );

    final TextStyle actualSelectedTextStyle = tester.renderObject<RenderParagraph>(find.text('Abc')).text.style!;
    final TextStyle actualUnselectedTextStyle = tester.renderObject<RenderParagraph>(find.text('Def')).text.style!;
    expect(actualSelectedTextStyle.fontSize, equals(selectedTextStyle.fontSize));
    expect(actualSelectedTextStyle.fontWeight, equals(selectedTextStyle.fontWeight));
    expect(actualUnselectedTextStyle.fontSize, equals(actualUnselectedTextStyle.fontSize));
    expect(actualUnselectedTextStyle.fontWeight, equals(actualUnselectedTextStyle.fontWeight));
  });

  testWidgets('Custom selected and unselected iconThemes are honored', (WidgetTester tester) async {
    const IconThemeData selectedIconTheme = IconThemeData(size: 36, color: Color(0x00000001));
    const IconThemeData unselectedIconTheme = IconThemeData(size: 18, color: Color(0x00000002));

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
        selectedIconTheme: selectedIconTheme,
        unselectedIconTheme: unselectedIconTheme,
      ),
    );

    final TextStyle actualSelectedIconTheme = _iconStyle(tester, Icons.favorite);
    final TextStyle actualUnselectedIconTheme = _iconStyle(tester, Icons.bookmark_border);
    expect(actualSelectedIconTheme.color, equals(selectedIconTheme.color));
    expect(actualSelectedIconTheme.fontSize, equals(selectedIconTheme.size));
    expect(actualUnselectedIconTheme.color, equals(unselectedIconTheme.color));
    expect(actualUnselectedIconTheme.fontSize, equals(unselectedIconTheme.size));
  });

  testWidgets('No selected destination when selectedIndex is null', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: null,
        destinations: _destinations(),
      ),
    );

    final Iterable<Semantics> semantics = tester.widgetList<Semantics>(find.byType(Semantics));
    expect(semantics.where((Semantics s) => s.properties.selected ?? false), isEmpty);
  });

  testWidgets('backgroundColor can be changed', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
      ),
    );

    expect(_railMaterial(tester).color, equals(Colors.white));

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
        backgroundColor: Colors.green,
      ),
    );

    expect(_railMaterial(tester).color, equals(Colors.green));
  });

  testWidgets('elevation can be changed', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
      ),
    );

    expect(_railMaterial(tester).elevation, equals(0));

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
        elevation: 7,
      ),
    );

    expect(_railMaterial(tester).elevation, equals(7));
  });

  testWidgets('Renders at the correct default width - [labelType]=none (default)', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, 80.0);
  });

  testWidgets('Renders at the correct default width - [labelType]=selected', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        labelType: NavigationRailLabelType.selected,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, 80.0);
  });

  testWidgets('Renders at the correct default width - [labelType]=all', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        labelType: NavigationRailLabelType.all,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, 80.0);
  });

  testWidgets('Renders wider for a destination with a long label - [labelType]=all', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        labelType: NavigationRailLabelType.all,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Longer Label'),
          ),
        ],
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    // Total padding is 16 (8 on each side).
    expect(renderBox.size.width, _labelRenderBox(tester, 'Longer Label').size.width + 16.0);
  });

  testWidgets('Renders only icons - [labelType]=none (default)', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
      ),
    );

    expect(find.byIcon(Icons.favorite), findsOneWidget);
    expect(find.byIcon(Icons.bookmark_border), findsOneWidget);
    expect(find.byIcon(Icons.star_border), findsOneWidget);
    expect(find.byIcon(Icons.hotel), findsOneWidget);

    // When there are no labels, a 0 opacity label is still shown for semantics.
    expect(_labelOpacity(tester, 'Abc'), 0);
    expect(_labelOpacity(tester, 'Def'), 0);
    expect(_labelOpacity(tester, 'Ghi'), 0);
    expect(_labelOpacity(tester, 'Jkl'), 0);
  });

  testWidgets('Renders icons and labels - [labelType]=all', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
      ),
    );

    expect(find.byIcon(Icons.favorite), findsOneWidget);
    expect(find.byIcon(Icons.bookmark_border), findsOneWidget);
    expect(find.byIcon(Icons.star_border), findsOneWidget);
    expect(find.byIcon(Icons.hotel), findsOneWidget);

    expect(find.text('Abc'), findsOneWidget);
    expect(find.text('Def'), findsOneWidget);
    expect(find.text('Ghi'), findsOneWidget);
    expect(find.text('Jkl'), findsOneWidget);

    // When displaying all labels, there is no opacity.
    expect(_opacityAboveLabel('Abc'), findsNothing);
    expect(_opacityAboveLabel('Def'), findsNothing);
    expect(_opacityAboveLabel('Ghi'), findsNothing);
    expect(_opacityAboveLabel('Jkl'), findsNothing);
  });

  testWidgets('Renders icons and selected label - [labelType]=selected', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.selected,
      ),
    );

    expect(find.byIcon(Icons.favorite), findsOneWidget);
    expect(find.byIcon(Icons.bookmark_border), findsOneWidget);
    expect(find.byIcon(Icons.star_border), findsOneWidget);
    expect(find.byIcon(Icons.hotel), findsOneWidget);

    // Only the selected label is visible.
    expect(_labelOpacity(tester, 'Abc'), 1);
    expect(_labelOpacity(tester, 'Def'), 0);
    expect(_labelOpacity(tester, 'Ghi'), 0);
    expect(_labelOpacity(tester, 'Jkl'), 0);
  });

  testWidgets('Destination spacing is correct - [labelType]=none (default), [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationPadding / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Destination spacing is correct - [labelType]=none (default), [textScaleFactor]=3.0', (WidgetTester tester) async {
    // Since the rail is icon only, its destinations should not be affected by
    // textScaleFactor.

    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 3.0,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationPadding / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Destination spacing is correct - [labelType]=none (default), [textScaleFactor]=0.75', (WidgetTester tester) async {
    // Since the rail is icon only, its destinations should not be affected by
    // textScaleFactor.

    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 0.75,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationPadding / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Destination spacing is correct - [labelType]=selected, [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between the indicator and label.
    const double destinationLabelSpacing = 4.0;
    // Height of the label.
    const double labelHeight = 16.0;
    // Height of a destination with both icon and label.
    const double destinationHeightWithLabel = destinationHeight + destinationLabelSpacing + labelHeight;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.selected,
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination is topPadding below the rail top.
    double nextDestinationY = topPadding;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstLabelRenderBox.size.width) / 2.0,
          nextDestinationY + destinationHeight + destinationLabelSpacing,
        ),
      ),
    );

    // The second destination is below the first with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is below the second with some spacing.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is below the third with some spacing.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  },
  skip: isBrowser, // https://github.com/flutter/flutter/issues/99786
  );

  testWidgets('Destination spacing is correct - [labelType]=selected, [textScaleFactor]=3.0', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 126.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between the indicator and label.
    const double destinationLabelSpacing = 4.0;
    // Height of the label.
    const double labelHeight = 16.0 * 3.0;
    // Height of a destination with both icon and label.
    const double destinationHeightWithLabel = destinationHeight + destinationLabelSpacing + labelHeight;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 3.0,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.selected,
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination topPadding below the rail top.
    double nextDestinationY = topPadding;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstLabelRenderBox.size.width) / 2.0,
          nextDestinationY + destinationHeight + destinationLabelSpacing,
        ),
      ),
    );

    // The second destination is below the first with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is below the second with some spacing.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is below the third with some spacing.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  },
  skip: isBrowser, // https://github.com/flutter/flutter/issues/99786
  );

  testWidgets('Destination spacing is correct - [labelType]=selected, [textScaleFactor]=0.75', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between the indicator and label.
    const double destinationLabelSpacing = 4.0;
    // Height of the label.
    const double labelHeight = 16.0 * 0.75;
    // Height of a destination with both icon and label.
    const double destinationHeightWithLabel = destinationHeight + destinationLabelSpacing + labelHeight;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 0.75,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.selected,
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination topPadding below the rail top.
    double nextDestinationY = topPadding;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstLabelRenderBox.size.width) / 2.0,
          nextDestinationY + destinationHeight + destinationLabelSpacing,
        ),
      ),
    );

    // The second destination is below the first with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is below the second with some spacing.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is below the third with some spacing.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  },
  skip: isBrowser, // https://github.com/flutter/flutter/issues/99786
  );

  testWidgets('Destination spacing is correct - [labelType]=all, [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between the indicator and label.
    const double destinationLabelSpacing = 4.0;
    // Height of the label.
    const double labelHeight = 16.0;
    // Height of a destination with both icon and label.
    const double destinationHeightWithLabel = destinationHeight + destinationLabelSpacing + labelHeight;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination topPadding below the rail top.
    double nextDestinationY = topPadding;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstLabelRenderBox.size.width) / 2.0,
          nextDestinationY + destinationHeight + destinationLabelSpacing,
        ),
      ),
    );

    // The second destination is below the first with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is below the second with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is below the third with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  },
  skip: isBrowser, // https://github.com/flutter/flutter/issues/99786
  );

  testWidgets('Destination spacing is correct - [labelType]=all, [textScaleFactor]=3.0', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 126.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between the indicator and label.
    const double destinationLabelSpacing = 4.0;
    // Height of the label.
    const double labelHeight = 16.0 * 3.0;
    // Height of a destination with both icon and label.
    const double destinationHeightWithLabel = destinationHeight + destinationLabelSpacing + labelHeight;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 3.0,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination topPadding below the rail top.
    double nextDestinationY = topPadding;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstLabelRenderBox.size.width) / 2.0,
          nextDestinationY + destinationHeight + destinationLabelSpacing,
        ),
      ),
    );

    // The second destination is below the first with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is below the second with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is below the third with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  },
  skip: isBrowser, // https://github.com/flutter/flutter/issues/99786
  );

  testWidgets('Destination spacing is correct - [labelType]=all, [textScaleFactor]=0.75', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between the indicator and label.
    const double destinationLabelSpacing = 4.0;
    // Height of the label.
    const double labelHeight = 16.0 * 0.75;
    // Height of a destination with both icon and label.
    const double destinationHeightWithLabel = destinationHeight + destinationLabelSpacing + labelHeight;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 0.75,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination topPadding below the rail top.
    double nextDestinationY = topPadding;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstLabelRenderBox.size.width) / 2.0,
          nextDestinationY + destinationHeight + destinationLabelSpacing,
        ),
      ),
    );

    // The second destination is below the first with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is below the second with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is below the third with some spacing.
    nextDestinationY += destinationHeightWithLabel + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  },
  skip: isBrowser, // https://github.com/flutter/flutter/issues/99786
  );

  testWidgets('Destination spacing is correct for a compact rail - [preferredWidth]=56, [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double compactWidth = 56.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        minWidth: 56.0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, 56.0);

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationSpacing / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is row below the first destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is a row below the second destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is a row below the third destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Destination spacing is correct for a compact rail - [preferredWidth]=56, [textScaleFactor]=3.0', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double compactWidth = 56.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 3.0,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        minWidth: 56.0,
        destinations: _destinations(),
      ),
    );

    // Since the rail is icon only, its preferred width should not be affected
    // by  textScaleFactor.
    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, compactWidth);

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationSpacing / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is row below the first destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is a row below the second destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is a row below the third destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Destination spacing is correct for a compact rail - [preferredWidth]=56, [textScaleFactor]=0.75', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double compactWidth = 56.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationSpacing = 12.0;

    await _pumpNavigationRail(
      tester,
      textScaleFactor: 0.75,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        minWidth: 56.0,
        destinations: _destinations(),
      ),
    );

    // Since the rail is icon only, its preferred width should not be affected
    // by  textScaleFactor.
    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, compactWidth);

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationSpacing / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is row below the first destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is a row below the second destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is a row below the third destination.
    nextDestinationY += destinationHeight + destinationSpacing;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (compactWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Group alignment works - [groupAlignment]=-1.0 (default)', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationPadding / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Group alignment works - [groupAlignment]=0.0', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        groupAlignment: 0.0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination below the rail top by some padding with an offset for the alignment.
    double nextDestinationY = topPadding + destinationPadding / 2 + 208;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Group alignment works - [groupAlignment]=1.0', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        groupAlignment: 1.0,
        destinations: _destinations(),
      ),
    );

    final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
    expect(renderBox.size.width, destinationWidth);

    // The first destination below the rail top by some padding with an offset for the alignment.
    double nextDestinationY = topPadding + destinationPadding / 2 + 416;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Leading and trailing appear in the correct places', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        leading: FloatingActionButton(onPressed: () { }),
        trailing: FloatingActionButton(onPressed: () { }),
        destinations: _destinations(),
      ),
    );

    final RenderBox leading = tester.renderObject<RenderBox>(find.byType(FloatingActionButton).at(0));
    final RenderBox trailing = tester.renderObject<RenderBox>(find.byType(FloatingActionButton).at(1));
    expect(leading.localToGlobal(Offset.zero), Offset((80 - leading.size.width) / 2, 8.0));
    expect(trailing.localToGlobal(Offset.zero), Offset((80 - trailing.size.width) / 2, 248.0));
  });

  testWidgets('Extended rail animates the width and labels appear - [textDirection]=LTR', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    bool extended = false;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Scaffold(
              body: Row(
                children: <Widget>[
                  NavigationRail(
                    selectedIndex: 0,
                    destinations: _destinations(),
                    extended: extended,
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

    expect(rail.size.width, destinationWidth);

    stateSetter(() {
      extended = true;
    });

    await tester.pump();
    await tester.pump(const Duration(milliseconds: 100));
    expect(rail.size.width, equals(168.0));

    await tester.pumpAndSettle();
    expect(rail.size.width, equals(256.0));

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationPadding / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          destinationWidth,
          nextDestinationY + (destinationHeight - firstLabelRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    final RenderBox secondLabelRenderBox = _labelRenderBox(tester, 'Def');
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      secondLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          destinationWidth,
          nextDestinationY + (destinationHeight - secondLabelRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    final RenderBox thirdLabelRenderBox = _labelRenderBox(tester, 'Ghi');
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      thirdLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          destinationWidth,
          nextDestinationY + (destinationHeight - thirdLabelRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    final RenderBox fourthLabelRenderBox = _labelRenderBox(tester, 'Jkl');
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          (destinationWidth - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      fourthLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          destinationWidth,
          nextDestinationY + (destinationHeight - fourthLabelRenderBox.size.height) / 2.0,
        ),
      ),
    );
  });

  testWidgets('Extended rail animates the width and labels appear - [textDirection]=RTL', (WidgetTester tester) async {
    // Padding at the top of the rail.
    const double topPadding = 8.0;
    // Width of a destination.
    const double destinationWidth = 80.0;
    // Height of a destination indicator with icon.
    const double destinationHeight = 32.0;
    // Space between destinations.
    const double destinationPadding = 12.0;

    bool extended = false;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Directionality(
              textDirection: TextDirection.rtl,
              child: Scaffold(
                body: Row(
                  textDirection: TextDirection.rtl,
                  children: <Widget>[
                    NavigationRail(
                      selectedIndex: 0,
                      destinations: _destinations(),
                      extended: extended,
                    ),
                    const Expanded(
                      child: Text('body'),
                    ),
                  ],
                ),
              ),
            );
          },
        ),
      ),
    );

    final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

    expect(rail.size.width, equals(destinationWidth));
    expect(rail.localToGlobal(Offset.zero), equals(const Offset(720.0, 0.0)));

    stateSetter(() {
      extended = true;
    });

    await tester.pump();
    await tester.pump(const Duration(milliseconds: 100));
    expect(rail.size.width, equals(168.0));
    expect(rail.localToGlobal(Offset.zero), equals(const Offset(632.0, 0.0)));

    await tester.pumpAndSettle();
    expect(rail.size.width, equals(256.0));
    expect(rail.localToGlobal(Offset.zero), equals(const Offset(544.0, 0.0)));

    // The first destination below the rail top by some padding.
    double nextDestinationY = topPadding + destinationPadding / 2;
    final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
    final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
    expect(
      firstIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800.0 - (destinationWidth + firstIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - firstIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      firstLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800.0 - destinationWidth - firstLabelRenderBox.size.width,
          nextDestinationY + (destinationHeight - firstLabelRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The second destination is one height below the first destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
    final RenderBox secondLabelRenderBox = _labelRenderBox(tester, 'Def');
    expect(
      secondIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800.0 - (destinationWidth + secondIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - secondIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      secondLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800.0 - destinationWidth - secondLabelRenderBox.size.width,
          nextDestinationY + (destinationHeight - secondLabelRenderBox.size.height) / 2.0,
        ),
      ),
    );

    // The third destination is one height below the second destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
    final RenderBox thirdLabelRenderBox = _labelRenderBox(tester, 'Ghi');
    expect(
      thirdIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800.0 - (destinationWidth + thirdIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - thirdIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      thirdLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800.0 - destinationWidth - thirdLabelRenderBox.size.width,
          nextDestinationY + (destinationHeight - thirdLabelRenderBox.size.height)  / 2.0,
        ),
      ),
    );

    // The fourth destination is one height below the third destination.
    nextDestinationY += destinationHeight + destinationPadding;
    final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
    final RenderBox fourthLabelRenderBox = _labelRenderBox(tester, 'Jkl');
    expect(
      fourthIconRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800 - (destinationWidth + fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (destinationHeight - fourthIconRenderBox.size.height) / 2.0,
        ),
      ),
    );
    expect(
      fourthLabelRenderBox.localToGlobal(Offset.zero),
      equals(
        Offset(
          800.0 - destinationWidth - fourthLabelRenderBox.size.width,
          nextDestinationY + (destinationHeight - fourthLabelRenderBox.size.height)  / 2.0,
        ),
      ),
    );
  });

  testWidgets('Extended rail gets wider with longer labels are larger text scale', (WidgetTester tester) async {
    bool extended = false;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Scaffold(
              body: Row(
                children: <Widget>[
                  MediaQuery(
                    data: MediaQuery.of(context).copyWith(textScaleFactor: 3.0),
                    child: NavigationRail(
                      selectedIndex: 0,
                      destinations: const <NavigationRailDestination>[
                        NavigationRailDestination(
                          icon: Icon(Icons.favorite_border),
                          selectedIcon: Icon(Icons.favorite),
                          label: Text('Abc'),
                        ),
                        NavigationRailDestination(
                          icon: Icon(Icons.bookmark_border),
                          selectedIcon: Icon(Icons.bookmark),
                          label: Text('Longer Label'),
                        ),
                      ],
                      extended: extended,
                    ),
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

    expect(rail.size.width, equals(80.0));

    stateSetter(() {
      extended = true;
    });

    await tester.pump();
    await tester.pump(const Duration(milliseconds: 100));
    expect(rail.size.width, equals(303.0));

    await tester.pumpAndSettle();
    expect(rail.size.width, equals(526.0));
  });

  testWidgets('Extended rail final width can be changed', (WidgetTester tester) async {
    bool extended = false;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Scaffold(
              body: Row(
                children: <Widget>[
                  NavigationRail(
                    selectedIndex: 0,
                    minExtendedWidth: 300,
                    destinations: _destinations(),
                    extended: extended,
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

    expect(rail.size.width, equals(80.0));

    stateSetter(() {
      extended = true;
    });

    await tester.pumpAndSettle();
    expect(rail.size.width, equals(300.0));
  });

  /// Regression test for https://github.com/flutter/flutter/issues/65657
  testWidgets('Extended rail transition does not jump from the beginning', (WidgetTester tester) async {
    bool extended = false;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Scaffold(
              body: Row(
                children: <Widget>[
                  NavigationRail(
                    selectedIndex: 0,
                    destinations: const <NavigationRailDestination>[
                      NavigationRailDestination(
                        icon: Icon(Icons.favorite_border),
                        selectedIcon: Icon(Icons.favorite),
                        label: Text('Abc'),
                      ),
                      NavigationRailDestination(
                        icon: Icon(Icons.bookmark_border),
                        selectedIcon: Icon(Icons.bookmark),
                        label: Text('Longer Label'),
                      ),
                    ],
                    extended: extended,
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    final Finder rail = find.byType(NavigationRail);

    // Before starting the animation, the rail has a width of 80.
    expect(tester.getSize(rail).width, 80.0);

    stateSetter(() {
      extended = true;
    });

    await tester.pump();
    // Create very close to 0, but non-zero, animation value.
    await tester.pump(const Duration(milliseconds: 1));
    // Expect that it has started to extend.
    expect(tester.getSize(rail).width, greaterThan(80.0));
    // Expect that it has only extended by a small amount, or that the first
    // frame does not jump. This helps verify that it is a smooth animation.
    expect(tester.getSize(rail).width, closeTo(80.0, 1.0));
  });

  testWidgets('Extended rail animation can be consumed', (WidgetTester tester) async {
    bool extended = false;
    late Animation<double> animation;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Scaffold(
              body: Row(
                children: <Widget>[
                  NavigationRail(
                    selectedIndex: 0,
                    leading: Builder(
                      builder: (BuildContext context) {
                        animation = NavigationRail.extendedAnimation(context);
                        return FloatingActionButton(onPressed: () { });
                      },
                    ),
                    destinations: _destinations(),
                    extended: extended,
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    expect(animation.isDismissed, isTrue);

    stateSetter(() {
      extended = true;
    });
    await tester.pumpAndSettle();

    expect(animation.isCompleted, isTrue);
  });

  testWidgets('onDestinationSelected is called', (WidgetTester tester) async {
    late int selectedIndex;

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: 0,
        destinations: _destinations(),
        onDestinationSelected: (int index) {
          selectedIndex = index;
        },
        labelType: NavigationRailLabelType.all,
      ),
    );

    await tester.tap(find.text('Def'));
    expect(selectedIndex, 1);

    await tester.tap(find.text('Ghi'));
    expect(selectedIndex, 2);

    // Wait for any pending shader compilation.
    tester.pumpAndSettle();
  });

  testWidgets('onDestinationSelected is not called if null', (WidgetTester tester) async {
    const int selectedIndex = 0;
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        selectedIndex: selectedIndex,
        destinations: _destinations(),
        labelType: NavigationRailLabelType.all,
      ),
    );

    await tester.tap(find.text('Def'));
    expect(selectedIndex, 0);

    // Wait for any pending shader compilation.
    tester.pumpAndSettle();
  });

  testWidgets('Changing destinations animate when [labelType]=selected', (WidgetTester tester) async {
    int selectedIndex = 0;

    await tester.pumpWidget(
      MaterialApp(
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return Scaffold(
              body: Row(
                children: <Widget>[
                  NavigationRail(
                    destinations: _destinations(),
                    selectedIndex: selectedIndex,
                    labelType: NavigationRailLabelType.selected,
                    onDestinationSelected: (int index) {
                      setState(() {
                        selectedIndex = index;
                      });
                    },
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    // Tap the second destination.
    await tester.tap(find.byIcon(Icons.bookmark_border));
    expect(selectedIndex, 1);

    // The second destination animates in.
    expect(_labelOpacity(tester, 'Def'), equals(0.0));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 100));
    expect(_labelOpacity(tester, 'Def'), equals(0.5));
    await tester.pumpAndSettle();
    expect(_labelOpacity(tester, 'Def'), equals(1.0));

    // Tap the third destination.
    await tester.tap(find.byIcon(Icons.star_border));
    expect(selectedIndex, 2);

    // The second destination animates out quickly and the third destination
    // animates in.
    expect(_labelOpacity(tester, 'Ghi'), equals(0.0));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 25));
    expect(_labelOpacity(tester, 'Def'), equals(0.5));
    expect(_labelOpacity(tester, 'Ghi'), equals(0.0));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 25));
    expect(_labelOpacity(tester, 'Def'), equals(0.0));
    expect(_labelOpacity(tester, 'Ghi'), equals(0.0));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 50));
    expect(_labelOpacity(tester, 'Ghi'), equals(0.5));
    await tester.pumpAndSettle();
    expect(_labelOpacity(tester, 'Ghi'), equals(1.0));
  });

  testWidgets('Changing destinations animate for selectedIndex=null', (WidgetTester tester) async {
    int? selectedIndex = 0;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Scaffold(
              body: Row(
                children: <Widget>[
                  NavigationRail(
                    destinations: _destinations(),
                    selectedIndex: selectedIndex,
                    labelType: NavigationRailLabelType.selected,
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    // Unset the selected index.
    stateSetter(() {
      selectedIndex = null;
    });

    // The first destination animates out.
    expect(_labelOpacity(tester, 'Abc'), equals(1.0));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 25));
    expect(_labelOpacity(tester, 'Abc'), equals(0.5));
    await tester.pumpAndSettle();
    expect(_labelOpacity(tester, 'Abc'), equals(0.0));

    // Set the selected index to the first destination.
    stateSetter(() {
      selectedIndex = 0;
    });

    // The first destination animates in.
    expect(_labelOpacity(tester, 'Abc'), equals(0.0));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 100));
    expect(_labelOpacity(tester, 'Abc'), equals(0.5));
    await tester.pumpAndSettle();
    expect(_labelOpacity(tester, 'Abc'), equals(1.0));
  });

  testWidgets('Changing destinations animate when selectedIndex=null during transition', (WidgetTester tester) async {
    int? selectedIndex = 0;
    late StateSetter stateSetter;

    await tester.pumpWidget(
      MaterialApp(
        home: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            stateSetter = setState;
            return Scaffold(
              body: Row(
                children: <Widget>[
                  NavigationRail(
                    destinations: _destinations(),
                    selectedIndex: selectedIndex,
                    labelType: NavigationRailLabelType.selected,
                  ),
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );

    stateSetter(() {
      selectedIndex = 1;
    });

    await tester.pump();
    await tester.pump(const Duration(milliseconds: 175));

    // Interrupt while animating from index 0 to 1.
    stateSetter(() {
      selectedIndex = null;
    });

    expect(_labelOpacity(tester, 'Abc'), equals(0));
    expect(_labelOpacity(tester, 'Def'), equals(1));

    await tester.pump();
    // Create very close to 0, but non-zero, animation value.
    await tester.pump(const Duration(milliseconds: 1));
    // Ensure the opacity is animated back towards 0.
    expect(_labelOpacity(tester, 'Def'), lessThan(0.5));
    expect(_labelOpacity(tester, 'Def'), closeTo(0.5, 0.03));

    await tester.pumpAndSettle();
    expect(_labelOpacity(tester, 'Abc'), equals(0.0));
    expect(_labelOpacity(tester, 'Def'), equals(0.0));
  });

  testWidgets('Semantics - labelType=[none]', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await _pumpLocalizedTestRail(tester, labelType: NavigationRailLabelType.none);

    expect(semantics, hasSemantics(_expectedSemantics(), ignoreId: true, ignoreTransform: true, ignoreRect: true));

    semantics.dispose();
  });

  testWidgets('Semantics - labelType=[selected]', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await _pumpLocalizedTestRail(tester, labelType: NavigationRailLabelType.selected);

    expect(semantics, hasSemantics(_expectedSemantics(), ignoreId: true, ignoreTransform: true, ignoreRect: true));

    semantics.dispose();
  });

  testWidgets('Semantics - labelType=[all]', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await _pumpLocalizedTestRail(tester, labelType: NavigationRailLabelType.all);

    expect(semantics, hasSemantics(_expectedSemantics(), ignoreId: true, ignoreTransform: true, ignoreRect: true));

    semantics.dispose();
  });

  testWidgets('Semantics - extended', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await _pumpLocalizedTestRail(tester, extended: true);

    expect(semantics, hasSemantics(_expectedSemantics(), ignoreId: true, ignoreTransform: true, ignoreRect: true));

    semantics.dispose();
  });

  testWidgets('NavigationRailDestination padding properly applied - NavigationRailLabelType.all', (WidgetTester tester) async {
    const EdgeInsets defaultPadding = EdgeInsets.symmetric(horizontal: 8.0);
    const EdgeInsets secondItemPadding = EdgeInsets.symmetric(vertical: 30.0);
    const EdgeInsets thirdItemPadding = EdgeInsets.symmetric(horizontal: 10.0);

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        labelType: NavigationRailLabelType.all,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
            padding: secondItemPadding,
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
            padding: thirdItemPadding,
          ),
        ],
      ),
    );

    final Padding firstItem = tester.widget<Padding>(
      find.descendant(of: find.widgetWithText(InkResponse, 'Abc'), matching: find.widgetWithText(Padding, 'Abc'))
    );
    final Padding secondItem = tester.widget<Padding>(
      find.descendant(of: find.widgetWithText(InkResponse, 'Def'), matching: find.widgetWithText(Padding, 'Def'))
    );
    final Padding thirdItem = tester.widget<Padding>(
        find.descendant(of: find.widgetWithText(InkResponse, 'Ghi'), matching: find.widgetWithText(Padding, 'Ghi'))
    );

    expect(firstItem.padding, defaultPadding);
    expect(secondItem.padding, secondItemPadding);
    expect(thirdItem.padding, thirdItemPadding);
  });

  testWidgets('NavigationRailDestination padding properly applied - NavigationRailLabelType.selected', (WidgetTester tester) async {
    const EdgeInsets defaultPadding = EdgeInsets.symmetric(horizontal: 8.0);
    const EdgeInsets secondItemPadding = EdgeInsets.symmetric(vertical: 30.0);
    const EdgeInsets thirdItemPadding = EdgeInsets.symmetric(horizontal: 10.0);

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        labelType: NavigationRailLabelType.selected,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
            padding: secondItemPadding,
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
            padding: thirdItemPadding,
          ),
        ],
      ),
    );

    final Padding firstItem = tester.widget<Padding>(
        find.descendant(of: find.widgetWithText(InkResponse, 'Abc'), matching: find.widgetWithText(Padding, 'Abc'))
    );
    final Padding secondItem = tester.widget<Padding>(
        find.descendant(of: find.widgetWithText(InkResponse, 'Def'), matching: find.widgetWithText(Padding, 'Def'))
    );
    final Padding thirdItem = tester.widget<Padding>(
        find.descendant(of: find.widgetWithText(InkResponse, 'Ghi'), matching: find.widgetWithText(Padding, 'Ghi'))
    );

    expect(firstItem.padding, defaultPadding);
    expect(secondItem.padding, secondItemPadding);
    expect(thirdItem.padding, thirdItemPadding);
  });

  testWidgets('NavigationRailDestination padding properly applied - NavigationRailLabelType.none', (WidgetTester tester) async {
    const EdgeInsets defaultPadding = EdgeInsets.zero;
    const EdgeInsets secondItemPadding = EdgeInsets.symmetric(vertical: 30.0);
    const EdgeInsets thirdItemPadding = EdgeInsets.symmetric(horizontal: 10.0);

    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        labelType: NavigationRailLabelType.none,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
            padding: secondItemPadding,
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
            padding: thirdItemPadding,
          ),
        ],
      ),
    );

    final Padding firstItem = tester.widget<Padding>(
        find.descendant(of: find.widgetWithText(InkResponse, 'Abc'), matching: find.widgetWithText(Padding, 'Abc'))
    );
    final Padding secondItem = tester.widget<Padding>(
        find.descendant(of: find.widgetWithText(InkResponse, 'Def'), matching: find.widgetWithText(Padding, 'Def'))
    );
    final Padding thirdItem = tester.widget<Padding>(
        find.descendant(of: find.widgetWithText(InkResponse, 'Ghi'), matching: find.widgetWithText(Padding, 'Ghi'))
    );

    expect(firstItem.padding, defaultPadding);
    expect(secondItem.padding, secondItemPadding);
    expect(thirdItem.padding, thirdItemPadding);
  });

  testWidgets('NavigationRailDestination adds indicator by default when ThemeData.useMaterial3 is true', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        labelType: NavigationRailLabelType.selected,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
          ),
        ],
      ),
    );

    expect(find.byType(NavigationIndicator), findsWidgets);
  });

  testWidgets('NavigationRailDestination adds indicator when useIndicator is true', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        useIndicator: true,
        labelType: NavigationRailLabelType.selected,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
          ),
        ],
      ),
    );

    expect(find.byType(NavigationIndicator), findsWidgets);
  });

  testWidgets('NavigationRailDestination does not add indicator when useIndicator is false', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        useIndicator: false,
        labelType: NavigationRailLabelType.selected,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
          ),
        ],
      ),
    );

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

  testWidgets('NavigationRailDestination adds an oval indicator when no labels are present', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        useIndicator: true,
        labelType: NavigationRailLabelType.none,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
          ),
        ],
      ),
    );

    final NavigationIndicator indicator = tester.widget<NavigationIndicator>(find.byType(NavigationIndicator).first);

    expect(indicator.width, 56);
    expect(indicator.height, 32);
  });

  testWidgets('NavigationRailDestination adds an oval indicator when selected labels are present', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        useIndicator: true,
        labelType: NavigationRailLabelType.selected,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
          ),
        ],
      ),
    );

    final NavigationIndicator indicator = tester.widget<NavigationIndicator>(find.byType(NavigationIndicator).first);

    expect(indicator.width, 56);
    expect(indicator.height, 32);
  });

  testWidgets('NavigationRailDestination adds an oval indicator when all labels are present', (WidgetTester tester) async {
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        useIndicator: true,
        labelType: NavigationRailLabelType.all,
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.star_border),
            selectedIcon: Icon(Icons.star),
            label: Text('Ghi'),
          ),
        ],
      ),
    );

    final NavigationIndicator indicator = tester.widget<NavigationIndicator>(find.byType(NavigationIndicator).first);

    expect(indicator.width, 56);
    expect(indicator.height, 32);
  });

  testWidgets('NavigationRailDestination has center aligned indicator - [labelType]=none', (WidgetTester tester) async {
    // This is a regression test for
    // https://github.com/flutter/flutter/issues/97753
    await _pumpNavigationRail(
      tester,
      navigationRail: NavigationRail(
        labelType: NavigationRailLabelType.none,
        selectedIndex: 0,
        destinations:  <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Stack(
              children: const <Widget>[
                Icon(Icons.umbrella),
                Positioned(
                  top: 0,
                  right: 0,
                  child: Text(
                    'Text',
                    style: TextStyle(fontSize: 10, color: Colors.red),
                  ),
                ),
              ],
            ),
            label: const Text('Abc'),
          ),
          const NavigationRailDestination(
            icon: Icon(Icons.umbrella),
            label: Text('Def'),
          ),
          const NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            label: Text('Ghi'),
          ),
        ],
      ),
    );
    // Indicator with Stack widget
    final RenderBox firstIndicator = tester.renderObject(find.byType(Icon).first);
    expect(firstIndicator.localToGlobal(Offset.zero).dx, 28.0);
    // Indicator without Stack widget
    final RenderBox lastIndicator = tester.renderObject(find.byType(Icon).last);
    expect(lastIndicator.localToGlobal(Offset.zero).dx, 28.0);
  });

  testWidgets('NavigationRail respects the notch/system navigation bar in landscape mode', (WidgetTester tester) async {
    const double safeAreaPadding = 40.0;
    NavigationRail navigationRail() {
      return NavigationRail(
        selectedIndex: 0,
        destinations: const <NavigationRailDestination>[
          NavigationRailDestination(
            icon: Icon(Icons.favorite_border),
            selectedIcon: Icon(Icons.favorite),
            label: Text('Abc'),
          ),
          NavigationRailDestination(
            icon: Icon(Icons.bookmark_border),
            selectedIcon: Icon(Icons.bookmark),
            label: Text('Def'),
          ),
        ],
      );
    }

    await tester.pumpWidget(_buildWidget(navigationRail()));
    final double defaultWidth = tester.getSize(find.byType(NavigationRail)).width;
    expect(defaultWidth, 80);

    await tester.pumpWidget(
      _buildWidget(
        MediaQuery(
          data: const MediaQueryData(
            padding: EdgeInsets.only(left: safeAreaPadding),
          ),
          child: navigationRail(),
        ),
      ),
    );
    final double updatedWidth = tester.getSize(find.byType(NavigationRail)).width;
    expect(updatedWidth, defaultWidth + safeAreaPadding);

    // test width when text direction is RTL.
    await tester.pumpWidget(
      _buildWidget(
        MediaQuery(
          data: const MediaQueryData(
            padding: EdgeInsets.only(right: safeAreaPadding),
          ),
          child: navigationRail(),
        ),
        isRTL: true,
      ),
    );
    final double updatedWidthRTL = tester.getSize(find.byType(NavigationRail)).width;
    expect(updatedWidthRTL, defaultWidth + safeAreaPadding);
  });

  group('Material 2', () {
    // Original Material 2 tests. Remove this group after `useMaterial3` has been deprecated.
    testWidgets('Renders at the correct default width - [labelType]=none (default)', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);
    });

    testWidgets('Renders at the correct default width - [labelType]=selected', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          labelType: NavigationRailLabelType.selected,
          destinations: _destinations(),
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);
    });

    testWidgets('Renders at the correct default width - [labelType]=all', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          labelType: NavigationRailLabelType.all,
          destinations: _destinations(),
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);
    });

    testWidgets('Destination spacing is correct - [labelType]=none (default), [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=none (default), [textScaleFactor]=3.0', (WidgetTester tester) async {
      // Since the rail is icon only, its destinations should not be affected by
      // textScaleFactor.
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 3.0,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=none (default), [textScaleFactor]=0.75', (WidgetTester tester) async {
      // Since the rail is icon only, its destinations should not be affected by
      // textScaleFactor.
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 0.75,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=selected, [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
          labelType: NavigationRailLabelType.selected,
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height - firstLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstLabelRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 + firstIconRenderBox.size.height - firstLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=selected, [textScaleFactor]=3.0', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 3.0,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
          labelType: NavigationRailLabelType.selected,
        ),
      );

      // The rail and destinations sizes grow to fit the larger text labels.
      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 142.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );

      // The first label sits right below the first icon.
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - firstLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + firstIconRenderBox.size.height,
          ),
        ),
      );

      nextDestinationY += 16.0 + firstIconRenderBox.size.height + firstLabelRenderBox.size.height + 16.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + 24.0,
          ),
        ),
      );

      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + 24.0,
          ),
        ),
      );

      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + 24.0,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=selected, [textScaleFactor]=0.75', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 0.75,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
          labelType: NavigationRailLabelType.selected,
        ),
      );

      // A smaller textScaleFactor will not reduce the default width of the rail
      // since there is a minWidth.
      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height - firstLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstLabelRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 + firstIconRenderBox.size.height - firstLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(Offset(
          (72.0 - fourthIconRenderBox.size.width) / 2.0,
          nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
        )),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=all, [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
          labelType: NavigationRailLabelType.all,
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + firstIconRenderBox.size.height,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      final RenderBox secondLabelRenderBox = _labelRenderBox(tester, 'Def');
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        secondLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + secondIconRenderBox.size.height,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      final RenderBox thirdLabelRenderBox = _labelRenderBox(tester, 'Ghi');
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        thirdLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + thirdIconRenderBox.size.height,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      final RenderBox fourthLabelRenderBox = _labelRenderBox(tester, 'Jkl');
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        fourthLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + fourthIconRenderBox.size.height,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=all, [textScaleFactor]=3.0', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 3.0,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
          labelType: NavigationRailLabelType.all,
        ),
      );

      // The rail and destinations sizes grow to fit the larger text labels.
      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 142.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - firstLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + firstIconRenderBox.size.height,
          ),
        ),
      );

      nextDestinationY += 16.0 + firstIconRenderBox.size.height + firstLabelRenderBox.size.height + 16.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      final RenderBox secondLabelRenderBox = _labelRenderBox(tester, 'Def');
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        secondLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - secondLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + secondIconRenderBox.size.height,
          ),
        ),
      );

      nextDestinationY += 16.0 + secondIconRenderBox.size.height + secondLabelRenderBox.size.height + 16.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      final RenderBox thirdLabelRenderBox = _labelRenderBox(tester, 'Ghi');
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        thirdLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - thirdLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + thirdIconRenderBox.size.height,
          ),
        ),
      );

      nextDestinationY += 16.0 + thirdIconRenderBox.size.height + thirdLabelRenderBox.size.height + 16.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      final RenderBox fourthLabelRenderBox = _labelRenderBox(tester, 'Jkl');
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        fourthLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (142.0 - fourthLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + fourthIconRenderBox.size.height,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct - [labelType]=all, [textScaleFactor]=0.75', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 0.75,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
          labelType: NavigationRailLabelType.all,
        ),
      );

      // A smaller textScaleFactor will not reduce the default size of the rail.
      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 72.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + firstIconRenderBox.size.height,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      final RenderBox secondLabelRenderBox = _labelRenderBox(tester, 'Def');
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        secondLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + secondIconRenderBox.size.height,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      final RenderBox thirdLabelRenderBox = _labelRenderBox(tester, 'Ghi');
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        thirdLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + thirdIconRenderBox.size.height,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      final RenderBox fourthLabelRenderBox = _labelRenderBox(tester, 'Jkl');
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0,
          ),
        ),
      );
      expect(
        fourthLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthLabelRenderBox.size.width) / 2.0,
            nextDestinationY + 16.0 + fourthIconRenderBox.size.height,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct for a compact rail - [preferredWidth]=56, [textScaleFactor]=1.0 (default)', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          minWidth: 56.0,
          destinations: _destinations(),
        ),
      );

      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 56.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 56 below the first destination.
      nextDestinationY += 56.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 56 below the second destination.
      nextDestinationY += 56.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 56 below the third destination.
      nextDestinationY += 56.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct for a compact rail - [preferredWidth]=56, [textScaleFactor]=3.0', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 3.0,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          minWidth: 56.0,
          destinations: _destinations(),
        ),
      );

      // Since the rail is icon only, its preferred width should not be affected
      // by  textScaleFactor.
      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 56.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 56 below the first destination.
      nextDestinationY += 56.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 56 below the second destination.
      nextDestinationY += 56.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 56 below the third destination.
      nextDestinationY += 56.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Destination spacing is correct for a compact rail - [preferredWidth]=56, [textScaleFactor]=0.75', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        textScaleFactor: 3.0,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          minWidth: 56.0,
          destinations: _destinations(),
        ),
      );

      // Since the rail is icon only, its preferred width should not be affected
      // by  textScaleFactor.
      final RenderBox renderBox = tester.renderObject(find.byType(NavigationRail));
      expect(renderBox.size.width, 56.0);

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 56 below the first destination.
      nextDestinationY += 56.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 56 below the second destination.
      nextDestinationY += 56.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 56 below the third destination.
      nextDestinationY += 56.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (56.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (56.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Group alignment works - [groupAlignment]=-1.0 (default)', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          destinations: _destinations(),
        ),
      );

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Group alignment works - [groupAlignment]=0.0', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          groupAlignment: 0.0,
          destinations: _destinations(),
        ),
      );

      double nextDestinationY = 160.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Group alignment works - [groupAlignment]=1.0', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          groupAlignment: 1.0,
          destinations: _destinations(),
        ),
      );

      double nextDestinationY = 312.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Leading and trailing appear in the correct places', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          selectedIndex: 0,
          leading: FloatingActionButton(onPressed: () { }),
          trailing: FloatingActionButton(onPressed: () { }),
          destinations: _destinations(),
        ),
      );

      final RenderBox leading = tester.renderObject<RenderBox>(find.byType(FloatingActionButton).at(0));
      final RenderBox trailing = tester.renderObject<RenderBox>(find.byType(FloatingActionButton).at(1));
      expect(leading.localToGlobal(Offset.zero), Offset((72 - leading.size.width) / 2.0, 8.0));
      expect(trailing.localToGlobal(Offset.zero), Offset((72 - trailing.size.width) / 2.0, 360.0));
    });

    testWidgets('Extended rail animates the width and labels appear - [textDirection]=LTR', (WidgetTester tester) async {
      bool extended = false;
      late StateSetter stateSetter;

      await tester.pumpWidget(
        MaterialApp(
          theme: ThemeData(useMaterial3: false),
          home: StatefulBuilder(
            builder: (BuildContext context, StateSetter setState) {
              stateSetter = setState;
              return Scaffold(
                body: Row(
                  children: <Widget>[
                    NavigationRail(
                      selectedIndex: 0,
                      destinations: _destinations(),
                      extended: extended,
                    ),
                    const Expanded(
                      child: Text('body'),
                    ),
                  ],
                ),
              );
            },
          ),
        ),
      );

      final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

      expect(rail.size.width, equals(72.0));

      stateSetter(() {
        extended = true;
      });

      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(rail.size.width, equals(164.0));

      await tester.pumpAndSettle();
      expect(rail.size.width, equals(256.0));

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            72.0,
            nextDestinationY + (72.0 - firstLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      final RenderBox secondLabelRenderBox = _labelRenderBox(tester, 'Def');
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        secondLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            72.0,
            nextDestinationY + (72.0 - secondLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      final RenderBox thirdLabelRenderBox = _labelRenderBox(tester, 'Ghi');
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        thirdLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            72.0,
            nextDestinationY + (72.0 - thirdLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      final RenderBox fourthLabelRenderBox = _labelRenderBox(tester, 'Jkl');
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            (72.0 - fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        fourthLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            72.0,
            nextDestinationY + (72.0 - fourthLabelRenderBox.size.height) / 2.0,
          ),
        ),
      );
    });

    testWidgets('Extended rail animates the width and labels appear - [textDirection]=RTL', (WidgetTester tester) async {
      bool extended = false;
      late StateSetter stateSetter;

      await tester.pumpWidget(
        MaterialApp(
          theme: ThemeData(useMaterial3: false),
          home: StatefulBuilder(
            builder: (BuildContext context, StateSetter setState) {
              stateSetter = setState;
              return Directionality(
                textDirection: TextDirection.rtl,
                child: Scaffold(
                  body: Row(
                    textDirection: TextDirection.rtl,
                    children: <Widget>[
                      NavigationRail(
                        selectedIndex: 0,
                        destinations: _destinations(),
                        extended: extended,
                      ),
                      const Expanded(
                        child: Text('body'),
                      ),
                    ],
                  ),
                ),
              );
            },
          ),
        ),
      );

      final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

      expect(rail.size.width, equals(72.0));
      expect(rail.localToGlobal(Offset.zero), equals(const Offset(728.0, 0.0)));

      stateSetter(() {
        extended = true;
      });

      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(rail.size.width, equals(164.0));
      expect(rail.localToGlobal(Offset.zero), equals(const Offset(636.0, 0.0)));

      await tester.pumpAndSettle();
      expect(rail.size.width, equals(256.0));
      expect(rail.localToGlobal(Offset.zero), equals(const Offset(544.0, 0.0)));

      // The first destination is 8 from the top because of the default vertical
      // padding at the to of the rail.
      double nextDestinationY = 8.0;
      final RenderBox firstIconRenderBox = _iconRenderBox(tester, Icons.favorite);
      final RenderBox firstLabelRenderBox = _labelRenderBox(tester, 'Abc');
      expect(
        firstIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - (72.0 + firstIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - firstIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        firstLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - 72.0 - firstLabelRenderBox.size.width,
            nextDestinationY + (72.0 - firstLabelRenderBox.size.height)  / 2.0,
          ),
        ),
      );

      // The second destination is 72 below the first destination.
      nextDestinationY += 72.0;
      final RenderBox secondIconRenderBox = _iconRenderBox(tester, Icons.bookmark_border);
      final RenderBox secondLabelRenderBox = _labelRenderBox(tester, 'Def');
      expect(
        secondIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - (72.0 + secondIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - secondIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        secondLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - 72.0 - secondLabelRenderBox.size.width,
            nextDestinationY + (72.0 - secondLabelRenderBox.size.height)  / 2.0,
          ),
        ),
      );

      // The third destination is 72 below the second destination.
      nextDestinationY += 72.0;
      final RenderBox thirdIconRenderBox = _iconRenderBox(tester, Icons.star_border);
      final RenderBox thirdLabelRenderBox = _labelRenderBox(tester, 'Ghi');
      expect(
        thirdIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - (72.0 + thirdIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - thirdIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        thirdLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - 72.0 - thirdLabelRenderBox.size.width,
            nextDestinationY + (72.0 - thirdLabelRenderBox.size.height)  / 2.0,
          ),
        ),
      );

      // The fourth destination is 72 below the third destination.
      nextDestinationY += 72.0;
      final RenderBox fourthIconRenderBox = _iconRenderBox(tester, Icons.hotel);
      final RenderBox fourthLabelRenderBox = _labelRenderBox(tester, 'Jkl');
      expect(
        fourthIconRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - (72.0 + fourthIconRenderBox.size.width) / 2.0,
            nextDestinationY + (72.0 - fourthIconRenderBox.size.height) / 2.0,
          ),
        ),
      );
      expect(
        fourthLabelRenderBox.localToGlobal(Offset.zero),
        equals(
          Offset(
            800.0 - 72.0 - fourthLabelRenderBox.size.width,
            nextDestinationY + (72.0 - fourthLabelRenderBox.size.height)  / 2.0,
          ),
        ),
      );
    });

    testWidgets('Extended rail gets wider with longer labels are larger text scale', (WidgetTester tester) async {
      bool extended = false;
      late StateSetter stateSetter;

      await tester.pumpWidget(
        MaterialApp(
          theme: ThemeData(useMaterial3: false),
          home: StatefulBuilder(
            builder: (BuildContext context, StateSetter setState) {
              stateSetter = setState;
              return Scaffold(
                body: Row(
                  children: <Widget>[
                    MediaQuery(
                      data: MediaQuery.of(context).copyWith(textScaleFactor: 3.0),
                      child: NavigationRail(
                        selectedIndex: 0,
                        destinations: const <NavigationRailDestination>[
                          NavigationRailDestination(
                            icon: Icon(Icons.favorite_border),
                            selectedIcon: Icon(Icons.favorite),
                            label: Text('Abc'),
                          ),
                          NavigationRailDestination(
                            icon: Icon(Icons.bookmark_border),
                            selectedIcon: Icon(Icons.bookmark),
                            label: Text('Longer Label'),
                          ),
                        ],
                        extended: extended,
                      ),
                    ),
                    const Expanded(
                      child: Text('body'),
                    ),
                  ],
                ),
              );
            },
          ),
        ),
      );

      final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

      expect(rail.size.width, equals(72.0));

      stateSetter(() {
        extended = true;
      });

      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(rail.size.width, equals(328.0));

      await tester.pumpAndSettle();
      expect(rail.size.width, equals(584.0));
    });

    testWidgets('Extended rail final width can be changed', (WidgetTester tester) async {
      bool extended = false;
      late StateSetter stateSetter;

      await tester.pumpWidget(
        MaterialApp(
          theme: ThemeData(useMaterial3: false),
          home: StatefulBuilder(
            builder: (BuildContext context, StateSetter setState) {
              stateSetter = setState;
              return Scaffold(
                body: Row(
                  children: <Widget>[
                    NavigationRail(
                      selectedIndex: 0,
                      minExtendedWidth: 300,
                      destinations: _destinations(),
                      extended: extended,
                    ),
                    const Expanded(
                      child: Text('body'),
                    ),
                  ],
                ),
              );
            },
          ),
        ),
      );

      final RenderBox rail = tester.firstRenderObject<RenderBox>(find.byType(NavigationRail));

      expect(rail.size.width, equals(72.0));

      stateSetter(() {
        extended = true;
      });

      await tester.pumpAndSettle();
      expect(rail.size.width, equals(300.0));
    });

    /// Regression test for https://github.com/flutter/flutter/issues/65657
    testWidgets('Extended rail transition does not jump from the beginning', (WidgetTester tester) async {
      bool extended = false;
      late StateSetter stateSetter;

      await tester.pumpWidget(
        MaterialApp(
          theme: ThemeData(useMaterial3: false),
          home: StatefulBuilder(
            builder: (BuildContext context, StateSetter setState) {
              stateSetter = setState;
              return Scaffold(
                body: Row(
                  children: <Widget>[
                    NavigationRail(
                      selectedIndex: 0,
                      destinations: const <NavigationRailDestination>[
                        NavigationRailDestination(
                          icon: Icon(Icons.favorite_border),
                          selectedIcon: Icon(Icons.favorite),
                          label: Text('Abc'),
                        ),
                        NavigationRailDestination(
                          icon: Icon(Icons.bookmark_border),
                          selectedIcon: Icon(Icons.bookmark),
                          label: Text('Longer Label'),
                        ),
                      ],
                      extended: extended,
                    ),
                    const Expanded(
                      child: Text('body'),
                    ),
                  ],
                ),
              );
            },
          ),
        ),
      );

      final Finder rail = find.byType(NavigationRail);

      // Before starting the animation, the rail has a width of 72.
      expect(tester.getSize(rail).width, 72.0);

      stateSetter(() {
        extended = true;
      });

      await tester.pump();
      // Create very close to 0, but non-zero, animation value.
      await tester.pump(const Duration(milliseconds: 1));
      // Expect that it has started to extend.
      expect(tester.getSize(rail).width, greaterThan(72.0));
      // Expect that it has only extended by a small amount, or that the first
      // frame does not jump. This helps verify that it is a smooth animation.
      expect(tester.getSize(rail).width, closeTo(72.0, 1.0));
    });

    testWidgets('NavigationRailDestination adds circular indicator when no labels are present', (WidgetTester tester) async {
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          useIndicator: true,
          labelType: NavigationRailLabelType.none,
          selectedIndex: 0,
          destinations: const <NavigationRailDestination>[
            NavigationRailDestination(
              icon: Icon(Icons.favorite_border),
              selectedIcon: Icon(Icons.favorite),
              label: Text('Abc'),
            ),
            NavigationRailDestination(
              icon: Icon(Icons.bookmark_border),
              selectedIcon: Icon(Icons.bookmark),
              label: Text('Def'),
            ),
            NavigationRailDestination(
              icon: Icon(Icons.star_border),
              selectedIcon: Icon(Icons.star),
              label: Text('Ghi'),
            ),
          ],
        ),
      );

      final NavigationIndicator indicator = tester.widget<NavigationIndicator>(find.byType(NavigationIndicator).first);

      expect(indicator.width, 56);
      expect(indicator.height, 56);
    });

    testWidgets('NavigationRailDestination has center aligned indicator - [labelType]=none', (WidgetTester tester) async {
      // This is a regression test for
      // https://github.com/flutter/flutter/issues/97753
      await _pumpNavigationRail(
        tester,
        useMaterial3: false,
        navigationRail: NavigationRail(
          labelType: NavigationRailLabelType.none,
          selectedIndex: 0,
          destinations:  <NavigationRailDestination>[
            NavigationRailDestination(
              icon: Stack(
                children: const <Widget>[
                  Icon(Icons.umbrella),
                  Positioned(
                    top: 0,
                    right: 0,
                    child: Text(
                      'Text',
                      style: TextStyle(fontSize: 10, color: Colors.red),
                    ),
                  ),
                ],
              ),
              label: const Text('Abc'),
            ),
            const NavigationRailDestination(
              icon: Icon(Icons.umbrella),
              label: Text('Def'),
            ),
            const NavigationRailDestination(
              icon: Icon(Icons.bookmark_border),
              label: Text('Ghi'),
            ),
          ],
        ),
      );
      // Indicator with Stack widget
      final RenderBox firstIndicator = tester.renderObject(find.byType(Icon).first);
      expect(firstIndicator.localToGlobal(Offset.zero).dx, 24.0);
      // Indicator without Stack widget
      final RenderBox lastIndicator = tester.renderObject(find.byType(Icon).last);
      expect(lastIndicator.localToGlobal(Offset.zero).dx, 24.0);
    });

    testWidgets('NavigationRail respects the notch/system navigation bar in landscape mode', (WidgetTester tester) async {
      const double safeAreaPadding = 40.0;
      NavigationRail navigationRail() {
        return NavigationRail(
          selectedIndex: 0,
          destinations: const <NavigationRailDestination>[
            NavigationRailDestination(
              icon: Icon(Icons.favorite_border),
              selectedIcon: Icon(Icons.favorite),
              label: Text('Abc'),
            ),
            NavigationRailDestination(
              icon: Icon(Icons.bookmark_border),
              selectedIcon: Icon(Icons.bookmark),
              label: Text('Def'),
            ),
          ],
        );
      }

      await tester.pumpWidget(_buildWidget(navigationRail(), useMaterial3: false));
      final double defaultWidth = tester.getSize(find.byType(NavigationRail)).width;
      expect(defaultWidth, 72);

      await tester.pumpWidget(
        _buildWidget(
            MediaQuery(
              data: const MediaQueryData(
                padding: EdgeInsets.only(left: safeAreaPadding),
              ),
              child: navigationRail(),
            ),
            useMaterial3: false
        ),
      );
      final double updatedWidth = tester.getSize(find.byType(NavigationRail)).width;
      expect(updatedWidth, defaultWidth + safeAreaPadding);

      // test width when text direction is RTL.
      await tester.pumpWidget(
        _buildWidget(
          MediaQuery(
            data: const MediaQueryData(
              padding: EdgeInsets.only(right: safeAreaPadding),
            ),
            child: navigationRail(),
          ),
          useMaterial3: false,
          isRTL: true,
        ),
      );
      final double updatedWidthRTL = tester.getSize(find.byType(NavigationRail)).width;
      expect(updatedWidthRTL, defaultWidth + safeAreaPadding);
    });

  }); // End Material 2 group
}

TestSemantics _expectedSemantics() {
  return TestSemantics.root(
    children: <TestSemantics>[
      TestSemantics(
        textDirection: TextDirection.ltr,
        children: <TestSemantics>[
          TestSemantics(
            children: <TestSemantics>[
              TestSemantics(
                flags: <SemanticsFlag>[SemanticsFlag.scopesRoute],
                children: <TestSemantics>[
                  TestSemantics(
                    flags: <SemanticsFlag>[
                      SemanticsFlag.isSelected,
                      SemanticsFlag.isFocusable,
                    ],
                    actions: <SemanticsAction>[SemanticsAction.tap],
                    label: 'Abc\nTab 1 of 4',
                    textDirection: TextDirection.ltr,
                  ),
                  TestSemantics(
                    flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
                    actions: <SemanticsAction>[SemanticsAction.tap],
                    label: 'Def\nTab 2 of 4',
                    textDirection: TextDirection.ltr,
                  ),
                  TestSemantics(
                    flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
                    actions: <SemanticsAction>[SemanticsAction.tap],
                    label: 'Ghi\nTab 3 of 4',
                    textDirection: TextDirection.ltr,
                  ),
                  TestSemantics(
                    flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
                    actions: <SemanticsAction>[SemanticsAction.tap],
                    label: 'Jkl\nTab 4 of 4',
                    textDirection: TextDirection.ltr,
                  ),
                  TestSemantics(
                    label: 'body',
                    textDirection: TextDirection.ltr,
                  ),
                ],
              ),
            ],
          ),
        ],
      ),
    ],
  );
}

List<NavigationRailDestination> _destinations() {
  return const <NavigationRailDestination>[
    NavigationRailDestination(
      icon: Icon(Icons.favorite_border),
      selectedIcon: Icon(Icons.favorite),
      label: Text('Abc'),
    ),
    NavigationRailDestination(
      icon: Icon(Icons.bookmark_border),
      selectedIcon: Icon(Icons.bookmark),
      label: Text('Def'),
    ),
    NavigationRailDestination(
      icon: Icon(Icons.star_border),
      selectedIcon: Icon(Icons.star),
      label: Text('Ghi'),
    ),
    NavigationRailDestination(
      icon: Icon(Icons.hotel),
      selectedIcon: Icon(Icons.home),
      label: Text('Jkl'),
    ),
  ];
}

Future<void> _pumpNavigationRail(
  WidgetTester tester, {
  double textScaleFactor = 1.0,
  required NavigationRail navigationRail,
  bool useMaterial3 = true,
}) async {
  await tester.pumpWidget(
    MaterialApp(
      theme: ThemeData(useMaterial3: useMaterial3),
      home: Builder(
        builder: (BuildContext context) {
          return MediaQuery(
            data: MediaQuery.of(context).copyWith(textScaleFactor: textScaleFactor),
            child: Scaffold(
              body: Row(
                children: <Widget>[
                  navigationRail,
                  const Expanded(
                    child: Text('body'),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    ),
  );
}

Future<void> _pumpLocalizedTestRail(WidgetTester tester, { NavigationRailLabelType? labelType, bool extended = false }) async {
  await tester.pumpWidget(
    Localizations(
      locale: const Locale('en', 'US'),
      delegates: const <LocalizationsDelegate<dynamic>>[
        DefaultMaterialLocalizations.delegate,
        DefaultWidgetsLocalizations.delegate,
      ],
      child: MaterialApp(
        home: Scaffold(
          body: Row(
            children: <Widget>[
              NavigationRail(
                selectedIndex: 0,
                extended: extended,
                destinations: _destinations(),
                labelType: labelType,
              ),
              const Expanded(
                child: Text('body'),
              ),
            ],
          ),
        ),
      ),
    ),
  );
}

RenderBox _iconRenderBox(WidgetTester tester, IconData iconData) {
  return tester.firstRenderObject<RenderBox>(
    find.descendant(
      of: find.byIcon(iconData),
      matching: find.byType(RichText),
    ),
  );
}

RenderBox _labelRenderBox(WidgetTester tester, String text) {
  return tester.firstRenderObject<RenderBox>(
    find.descendant(
      of: find.text(text),
      matching: find.byType(RichText),
    ),
  );
}

TextStyle _iconStyle(WidgetTester tester, IconData icon) {
  return tester.widget<RichText>(
    find.descendant(
      of: find.byIcon(icon),
      matching: find.byType(RichText),
    ),
  ).text.style!;
}

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

// Only valid when labelType != all.
double? _labelOpacity(WidgetTester tester, String text) {
  // We search for both Opacity and FadeTransition since in some
  // cases opacity is animated, in other it's not.
  final Iterable<Opacity> opacityWidgets = tester.widgetList<Opacity>(find.ancestor(
    of: find.text(text),
    matching: find.byType(Opacity),
  ));
  if (opacityWidgets.isNotEmpty) {
    return opacityWidgets.single.opacity;
  }

  final FadeTransition fadeTransitionWidget = tester.widget<FadeTransition>(
    find.ancestor(
      of: find.text(text),
      matching: find.byType(FadeTransition),
    ).first, // first because there's also a FadeTransition from the MaterialPageRoute, which is up the tree
  );
  return fadeTransitionWidget.opacity.value;
}

Material _railMaterial(WidgetTester tester) {
  // The first material is for the rail, and the rest are for the destinations.
  return tester.firstWidget<Material>(
    find.descendant(
      of: find.byType(NavigationRail),
      matching: find.byType(Material),
    ),
  );
}

Widget _buildWidget(Widget child, {bool useMaterial3 = true, bool isRTL = false}) {
  return MaterialApp(
    theme: ThemeData(useMaterial3: useMaterial3),
    home: Directionality(
      textDirection: isRTL ? TextDirection.rtl : TextDirection.ltr,
      child: Scaffold(
        body: Row(
          children: <Widget>[
            child,
            const Expanded(
              child: Text('body'),
            ),
          ],
        ),
      ),
    ),
  );
}