about_test.dart 61.3 KB
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';
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import 'dart:ui';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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  tearDown(() {
    LicenseRegistry.reset();
  });

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  testWidgets('Material3 has sentence case labels', (WidgetTester tester) async {
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    await tester.pumpWidget(MaterialApp(
      theme: ThemeData(useMaterial3: true),
      builder: (BuildContext context, Widget? child) {
        return MediaQuery(
          // Display has a vertical hinge down the middle
          data: const MediaQueryData(
            size: Size(800, 600),
            displayFeatures: <DisplayFeature>[
              DisplayFeature(
                bounds: Rect.fromLTRB(390, 0, 410, 600),
                type: DisplayFeatureType.hinge,
                state: DisplayFeatureState.unknown,
              ),
            ],
          ),
          child: child!,
        );
      },
      home: Builder(
        builder: (BuildContext context) => ElevatedButton(
          onPressed: () {
            showAboutDialog(
              context: context,
              useRootNavigator: false,
              applicationName: 'A',
            );
          },
          child: const Text('Show About Dialog'),
        ),
      ),
    ));

    // Open the dialog.
    await tester.tap(find.byType(ElevatedButton));
    await tester.pumpAndSettle();
    expect(find.text('Close'), findsOneWidget);
    expect(find.text('View licenses'), findsOneWidget);
  });

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  testWidgets('Material2 - AboutListTile control test', (WidgetTester tester) async {
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    const FlutterLogo logo = FlutterLogo();

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    await tester.pumpWidget(
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      MaterialApp(
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        theme: ThemeData(useMaterial3: false),
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        title: 'Pirate app',
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        home: Scaffold(
          appBar: AppBar(
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            title: const Text('Home'),
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          ),
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          drawer: Drawer(
            child: ListView(
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              children: const <Widget>[
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                AboutListTile(
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                  applicationVersion: '0.1.2',
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                  applicationIcon: logo,
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                  applicationLegalese: 'I am the very model of a modern major general.',
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                  aboutBoxChildren: <Widget>[
                    Text('About box'),
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                  ],
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                ),
              ],
            ),
          ),
        ),
      ),
    );

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

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

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

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

    await tester.tap(find.text('VIEW LICENSES'));
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    await tester.pumpAndSettle();
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    expect(find.text('Pirate app'), findsOneWidget);
    expect(find.text('0.1.2'), findsOneWidget);
    expect(find.byWidget(logo), findsOneWidget);
    expect(
      find.text('I am the very model of a modern major general.'),
      findsOneWidget,
    );
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    await tester.tap(find.text('Pirate package '));
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    await tester.pumpAndSettle();
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    expect(find.text('Pirate license'), findsOneWidget);
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  });
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  testWidgets('Material3 - AboutListTile control test', (WidgetTester tester) async {
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    const FlutterLogo logo = FlutterLogo();

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        title: 'Pirate app',
        home: Scaffold(
          appBar: AppBar(
            title: const Text('Home'),
          ),
          drawer: Drawer(
            child: ListView(
              children: const <Widget>[
                AboutListTile(
                  applicationVersion: '0.1.2',
                  applicationIcon: logo,
                  applicationLegalese: 'I am the very model of a modern major general.',
                  aboutBoxChildren: <Widget>[
                    Text('About box'),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );

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

    await tester.tap(find.byType(IconButton));
    await tester.pumpAndSettle();

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

    await tester.tap(find.text('About Pirate app'));
    await tester.pumpAndSettle();

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

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

    await tester.tap(find.text('View licenses'));
    await tester.pumpAndSettle();

    expect(find.text('Pirate app'), findsOneWidget);
    expect(find.text('0.1.2'), findsOneWidget);
    expect(find.byWidget(logo), findsOneWidget);
    expect(
      find.text('I am the very model of a modern major general.'),
      findsOneWidget,
    );
    await tester.tap(find.text('Pirate package '));
    await tester.pumpAndSettle();
    expect(find.text('Pirate license'), findsOneWidget);
  });

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

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

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

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    await tester.pumpWidget(
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      const MaterialApp(
        home: Center(
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          child: LicensePage(),
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        ),
      ),
    );
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    expect(find.text('AAA'), findsNothing);
    expect(find.text('BBB'), findsNothing);
    expect(find.text('Another package'), findsNothing);
    expect(find.text('Another license'), findsNothing);
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    await tester.pumpAndSettle();
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    // Check for packages.
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    expect(find.text('AAA'), findsOneWidget);
    expect(find.text('Another package'), findsOneWidget);
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    // Check license is displayed after entering into license page for 'AAA'.
    await tester.tap(find.text('AAA'));
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    await tester.pumpAndSettle();
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    expect(find.text('BBB'), findsOneWidget);

    /// Go back to list of packages.
    await tester.pageBack();
    await tester.pumpAndSettle();

    /// Check license is displayed after entering into license page for
    /// 'Another package'.
    await tester.tap(find.text('Another package'));
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    await tester.pumpAndSettle();
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    expect(find.text('Another license'), findsOneWidget);
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  });
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  testWidgets('LicensePage control test with all properties', (WidgetTester tester) async {
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    const FlutterLogo logo = FlutterLogo();

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

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

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

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

    await tester.pumpAndSettle();

    expect(find.text('Pirate app'), findsNothing);
    expect(find.text('LicensePage test app'), findsOneWidget);
    expect(find.text('0.1.2'), findsOneWidget);
    expect(find.byWidget(logo), findsOneWidget);
    expect(
      find.text('I am the very model of a modern major general.'),
      findsOneWidget,
    );
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    // Check for packages.
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    expect(find.text('AAA'), findsOneWidget);
    expect(find.text('Another package'), findsOneWidget);
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    // Check license is displayed after entering into license page for 'AAA'.
    await tester.tap(find.text('AAA'));
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    await tester.pumpAndSettle();
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    expect(find.text('BBB'), findsOneWidget);

    /// Go back to list of packages.
    await tester.pageBack();
    await tester.pumpAndSettle();

    /// Check license is displayed after entering into license page for
    /// 'Another package'.
    await tester.tap(find.text('Another package'));
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    await tester.pumpAndSettle();
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    expect(find.text('Another license'), findsOneWidget);
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  });
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  testWidgets('Material2 - _PackageLicensePage title style without AppBarTheme', (WidgetTester tester) async {
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    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
      ]);
    });

    const TextStyle titleTextStyle = TextStyle(
      fontSize: 20,
      color: Colors.black,
      inherit: false,
    );
    const TextStyle subtitleTextStyle = TextStyle(
      fontSize: 15,
      color: Colors.red,
      inherit: false,
    );

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(
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          useMaterial3: false,
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          primaryTextTheme: const TextTheme(
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            titleLarge: titleTextStyle,
            titleSmall: subtitleTextStyle,
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          ),
        ),
        home: const Center(
          child: LicensePage(),
        ),
      ),
    );
    await tester.pumpAndSettle();

    // Check for packages.
    expect(find.text('AAA'), findsOneWidget);

    // Check license is displayed after entering into license page for 'AAA'.
    await tester.tap(find.text('AAA'));
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    await tester.pumpAndSettle();
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    // Check for titles style.
    final Text title = tester.widget(find.text('AAA'));
    expect(title.style, titleTextStyle);
    final Text subtitle = tester.widget(find.text('1 license.'));
    expect(subtitle.style, subtitleTextStyle);
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  });
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  testWidgets('Material3 - _PackageLicensePage title style without AppBarTheme', (WidgetTester tester) async {
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    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
      ]);
    });

    const TextStyle titleTextStyle = TextStyle(
      fontSize: 20,
      color: Colors.black,
      inherit: false,
    );
    const TextStyle subtitleTextStyle = TextStyle(
      fontSize: 15,
      color: Colors.red,
      inherit: false,
    );

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(
          useMaterial3: true,
          textTheme: const TextTheme(
            titleLarge: titleTextStyle,
            titleSmall: subtitleTextStyle,
          ),
        ),
        home: const Center(
          child: LicensePage(),
        ),
      ),
    );
    await tester.pumpAndSettle();

    // Check for packages.
    expect(find.text('AAA'), findsOneWidget);

    // Check license is displayed after entering into license page for 'AAA'.
    await tester.tap(find.text('AAA'));
    await tester.pumpAndSettle();

    // Check for titles style.
    final Text title = tester.widget(find.text('AAA'));
    expect(title.style, titleTextStyle);
    final Text subtitle = tester.widget(find.text('1 license.'));
    expect(subtitle.style, subtitleTextStyle);
  });

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  testWidgets('_PackageLicensePage title style with AppBarTheme', (WidgetTester tester) async {
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    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
      ]);
    });

    const TextStyle titleTextStyle = TextStyle(
      fontSize: 20,
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      color: Colors.indigo,
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    );

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(
          // Not used because appBarTheme is prioritized.
          primaryTextTheme: const TextTheme(
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            titleLarge: TextStyle(
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              fontSize: 12,
              color: Colors.grey,
            ),
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            titleSmall: TextStyle(
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              fontSize: 10,
              color: Colors.grey,
            ),
          ),
          appBarTheme: const AppBarTheme(
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            titleTextStyle: titleTextStyle,
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            foregroundColor: Colors.indigo,
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          ),
        ),
        home: const Center(
          child: LicensePage(),
        ),
      ),
    );
    await tester.pumpAndSettle();

    // Check for packages.
    expect(find.text('AAA'), findsOneWidget);

    // Check license is displayed after entering into license page for 'AAA'.
    await tester.tap(find.text('AAA'));
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    await tester.pumpAndSettle();
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    // Check for titles style.
    final Text title = tester.widget(find.text('AAA'));
    expect(title.style, titleTextStyle);
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  });
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  testWidgets('Material2 - LicensePage respects the notch', (WidgetTester tester) async {
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    const double safeareaPadding = 27.0;

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

    await tester.pumpWidget(
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      MaterialApp(
        theme: ThemeData(useMaterial3: false),
        home: const MediaQuery(
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          data: MediaQueryData(
            padding: EdgeInsets.all(safeareaPadding),
          ),
          child: LicensePage(),
        ),
      ),
    );

    await tester.pumpAndSettle();

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    // The position of the top left of app bar title should indicate whether
    // the safe area is sufficiently respected.
    expect(
      tester.getTopLeft(find.text('Licenses')),
      const Offset(16.0 + safeareaPadding, 18.0 + safeareaPadding),
    );
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  });
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  testWidgets('Material3 - LicensePage respects the notch', (WidgetTester tester) async {
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    const double safeareaPadding = 27.0;

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

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        home: const MediaQuery(
          data: MediaQueryData(
            padding: EdgeInsets.all(safeareaPadding),
          ),
          child: LicensePage(),
        ),
      ),
    );

    await tester.pumpAndSettle();

    // The position of the top left of app bar title should indicate whether
    // the safe area is sufficiently respected.
    expect(
      tester.getTopLeft(find.text('Licenses')),
      const Offset(16.0 + safeareaPadding, 14.0 + safeareaPadding),
    );
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  }, skip: kIsWeb && !isCanvasKit); // https://github.com/flutter/flutter/issues/99933
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  testWidgets('LicensePage returns early if unmounted', (WidgetTester tester) async {
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    final Completer<LicenseEntry> licenseCompleter = Completer<LicenseEntry>();
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromFuture(licenseCompleter.future);
    });

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

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

    await tester.pumpAndSettle();
    final FakeLicenseEntry licenseEntry = FakeLicenseEntry();
    licenseCompleter.complete(licenseEntry);
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    expect(licenseEntry.packagesCalled, false);
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  });
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  testWidgets('LicensePage returns late if unmounted', (WidgetTester tester) async {
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    final Completer<LicenseEntry> licenseCompleter = Completer<LicenseEntry>();
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromFuture(licenseCompleter.future);
    });

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

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

    await tester.pumpAndSettle();
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    expect(licenseEntry.packagesCalled, true);
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  });
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  testWidgets('LicensePage logic defaults to executable name for app name', (WidgetTester tester) async {
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    await tester.pumpWidget(
      const MaterialApp(
        title: 'flutter_tester',
        home: Material(child: LicensePage()),
      ),
    );
    expect(find.text('flutter_tester'), findsOneWidget);
  });
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  testWidgets('AboutListTile dense property is applied', (WidgetTester tester) async {
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    await tester.pumpWidget(const MaterialApp(
      home: Material(child: Center(child: AboutListTile())),
    ));
    Rect tileRect = tester.getRect(find.byType(AboutListTile));
    expect(tileRect.height, 56.0);

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

    await tester.pumpWidget(const MaterialApp(
      home: Material(child: Center(child: AboutListTile(dense: true))),
    ));
    tileRect = tester.getRect(find.byType(AboutListTile));
    expect(tileRect.height, 48.0);
  });
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  testWidgets('showLicensePage uses nested navigator by default', (WidgetTester tester) async {
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    final LicensePageObserver rootObserver = LicensePageObserver();
    final LicensePageObserver nestedObserver = LicensePageObserver();

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

    // Open the dialog.
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    await tester.tap(find.byType(ElevatedButton));
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    expect(rootObserver.licensePageCount, 0);
    expect(nestedObserver.licensePageCount, 1);
  });

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

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

    // Open the dialog.
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    await tester.tap(find.byType(ElevatedButton));
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    expect(rootObserver.licensePageCount, 1);
    expect(nestedObserver.licensePageCount, 0);
  });

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  group('Barrier dismissible', () {
    late AboutDialogObserver rootObserver;

    setUp(() {
      rootObserver = AboutDialogObserver();
    });

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    testWidgets('Barrier is dismissible with default parameter', (WidgetTester tester) async {
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      await tester.pumpWidget(
        MaterialApp(
          navigatorObservers: <NavigatorObserver>[rootObserver],
          home: Material(
            child: Center(
              child: Builder(
                builder: (BuildContext context) {
                  return ElevatedButton(
                    child: const Text('X'),
                    onPressed: () => showAboutDialog(
                      context: context,
                    ),
                  );
                },
              ),
            ),
          ),
        ),
      );

      // Open the dialog.
      await tester.tap(find.byType(ElevatedButton));
      await tester.pumpAndSettle();
      expect(rootObserver.dialogCount, 1);

      // Tap on the barrier.
      await tester.tapAt(const Offset(10.0, 10.0));
      await tester.pumpAndSettle();
      expect(rootObserver.dialogCount, 0);
    });

766
    testWidgets('Barrier is not dismissible with barrierDismissible is false', (WidgetTester tester) async {
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      await tester.pumpWidget(
        MaterialApp(
          navigatorObservers: <NavigatorObserver>[rootObserver],
          home: Material(
            child: Center(
              child: Builder(
                builder: (BuildContext context) {
                  return ElevatedButton(
                    child: const Text('X'),
                    onPressed: () => showAboutDialog(
                        context: context,
                        barrierDismissible: false
                    ),
                  );
                },
              ),
            ),
          ),
        ),
      );

      // Open the dialog.
      await tester.tap(find.byType(ElevatedButton));
      await tester.pumpAndSettle();
      expect(rootObserver.dialogCount, 1);

      // Tap on the barrier, which shouldn't do anything this time.
      await tester.tapAt(const Offset(10.0, 10.0));
      await tester.pumpAndSettle();
      expect(rootObserver.dialogCount, 1);
    });
  });

800
  testWidgets('Barrier color', (WidgetTester tester) async {
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    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: Center(
            child: Builder(
              builder: (BuildContext context) {
                return ElevatedButton(
                  child: const Text('X'),
                  onPressed: () => showAboutDialog(
                    context: context,
                  ),
                );
              },
            ),
          ),
        ),
      ),
    );

    // Open the dialog.
    await tester.tap(find.byType(ElevatedButton));
    await tester.pumpAndSettle();
    expect(tester.widget<ModalBarrier>(find.byType(ModalBarrier).last).color, Colors.black54);

    // Dismiss the dialog.
    await tester.tapAt(const Offset(10.0, 10.0));

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: Center(
            child: Builder(
              builder: (BuildContext context) {
                return ElevatedButton(
                  child: const Text('X'),
                  onPressed: () => showAboutDialog(
                    context: context,
                    barrierColor: Colors.pink,
                  ),
                );
              },
            ),
          ),
        ),
      ),
    );

    // Open the dialog.
    await tester.tap(find.byType(ElevatedButton));
    await tester.pumpAndSettle();
    expect(tester.widget<ModalBarrier>(find.byType(ModalBarrier).last).color, Colors.pink);
  });

854
  testWidgets('Barrier Label', (WidgetTester tester) async {
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    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: Center(
            child: Builder(
              builder: (BuildContext context) {
                return ElevatedButton(
                  child: const Text('X'),
                  onPressed: () => showAboutDialog(
                    context: context,
                    barrierLabel: 'Custom Label',
                  ),
                );
              },
            ),
          ),
        ),
      ),
    );

    // Open the dialog.
    await tester.tap(find.byType(ElevatedButton));
    await tester.pumpAndSettle();
    expect(tester.widget<ModalBarrier>(find.byType(ModalBarrier).last).semanticsLabel, 'Custom Label');
  });

881
  testWidgets('showAboutDialog uses root navigator by default', (WidgetTester tester) async {
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    final AboutDialogObserver rootObserver = AboutDialogObserver();
    final AboutDialogObserver nestedObserver = AboutDialogObserver();

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

    // Open the dialog.
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    await tester.tap(find.byType(ElevatedButton));
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    expect(rootObserver.dialogCount, 1);
    expect(nestedObserver.dialogCount, 0);
  });

914
  testWidgets('showAboutDialog uses nested navigator if useRootNavigator is false', (WidgetTester tester) async {
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    final AboutDialogObserver rootObserver = AboutDialogObserver();
    final AboutDialogObserver nestedObserver = AboutDialogObserver();

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

    // Open the dialog.
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    await tester.tap(find.byType(ElevatedButton));
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    expect(rootObserver.dialogCount, 0);
    expect(nestedObserver.dialogCount, 1);
  });
947

948
  group('showAboutDialog avoids overlapping display features', () {
949
    testWidgets('default positioning', (WidgetTester tester) async {
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      await tester.pumpWidget(MaterialApp(
        builder: (BuildContext context, Widget? child) {
          return MediaQuery(
            // Display has a vertical hinge down the middle
            data: const MediaQueryData(
              size: Size(800, 600),
              displayFeatures: <DisplayFeature>[
                DisplayFeature(
                  bounds: Rect.fromLTRB(390, 0, 410, 600),
                  type: DisplayFeatureType.hinge,
                  state: DisplayFeatureState.unknown,
                ),
              ],
            ),
            child: child!,
          );
        },
        home: Builder(
          builder: (BuildContext context) => ElevatedButton(
            onPressed: () {
              showAboutDialog(
                context: context,
                useRootNavigator: false,
                applicationName: 'A',
              );
            },
            child: const Text('Show About Dialog'),
          ),
        ),
      ));

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

      // By default it should place the dialog on the left screen
      expect(tester.getTopLeft(find.byType(AboutDialog)), Offset.zero);
      expect(tester.getBottomRight(find.byType(AboutDialog)), const Offset(390.0, 600.0));
    });

990
    testWidgets('positioning using anchorPoint', (WidgetTester tester) async {
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      await tester.pumpWidget(MaterialApp(
        builder: (BuildContext context, Widget? child) {
          return MediaQuery(
            // Display has a vertical hinge down the middle
            data: const MediaQueryData(
              size: Size(800, 600),
              displayFeatures: <DisplayFeature>[
                DisplayFeature(
                  bounds: Rect.fromLTRB(390, 0, 410, 600),
                  type: DisplayFeatureType.hinge,
                  state: DisplayFeatureState.unknown,
                ),
              ],
            ),
            child: child!,
          );
        },
        home: Builder(
          builder: (BuildContext context) => ElevatedButton(
            onPressed: () {
              showAboutDialog(
                context: context,
                useRootNavigator: false,
                applicationName: 'A',
                anchorPoint: const Offset(1000, 0),
              );
            },
            child: const Text('Show About Dialog'),
          ),
        ),
      ));

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

      // The anchorPoint hits the right side of the display
      expect(tester.getTopLeft(find.byType(AboutDialog)), const Offset(410.0, 0.0));
      expect(tester.getBottomRight(find.byType(AboutDialog)), const Offset(800.0, 600.0));
    });

1032
    testWidgets('positioning using Directionality', (WidgetTester tester) async {
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      await tester.pumpWidget(MaterialApp(
        builder: (BuildContext context, Widget? child) {
          return MediaQuery(
            // Display has a vertical hinge down the middle
            data: const MediaQueryData(
              size: Size(800, 600),
              displayFeatures: <DisplayFeature>[
                DisplayFeature(
                  bounds: Rect.fromLTRB(390, 0, 410, 600),
                  type: DisplayFeatureType.hinge,
                  state: DisplayFeatureState.unknown,
                ),
              ],
            ),
            child: Directionality(
              textDirection: TextDirection.rtl,
              child: child!,
            ),
          );
        },
        home: Builder(
          builder: (BuildContext context) => ElevatedButton(
            onPressed: () {
              showAboutDialog(
                context: context,
                useRootNavigator: false,
                applicationName: 'A',
              );
            },
            child: const Text('Show About Dialog'),
          ),
        ),
      ));

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

      // Since this is rtl, the first screen is the on the right
      expect(tester.getTopLeft(find.byType(AboutDialog)), const Offset(410.0, 0.0));
      expect(tester.getBottomRight(find.byType(AboutDialog)), const Offset(800.0, 600.0));
    });
  });

1077
  testWidgets("AboutListTile's child should not be offset when the icon is not specified.", (WidgetTester tester) async {
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    await tester.pumpWidget(
      const MaterialApp(
        home: Scaffold(
          body: AboutListTile(
            child: Text('About'),
          ),
        ),
      ),
    );

    expect(
      find.descendant(
        of: find.byType(AboutListTile),
        matching: find.byType(Icon),
      ),
      findsNothing,
    );
  });
1096

1097
  testWidgets("AboutDialog's contents are scrollable", (WidgetTester tester) async {
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    final Key contentKey = UniqueKey();
    await tester.pumpWidget(MaterialApp(
      home: Navigator(
        onGenerateRoute: (RouteSettings settings) {
          return MaterialPageRoute<dynamic>(
            builder: (BuildContext context) {
1104
              return ElevatedButton(
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                onPressed: () {
                  showAboutDialog(
                    context: context,
                    useRootNavigator: false,
                    applicationName: 'A',
                    children: <Widget>[
                      Container(
                        key: contentKey,
                        color: Colors.orange,
                        height: 500,
                      ),
                    ],
                  );
                },
                child: const Text('Show About Dialog'),
              );
            },
          );
        },
      ),
    ));

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

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

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

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

    expect(box.localToGlobal(Offset.zero), equals(originalOffset.translate(0.0, -20.0)));
  });
1144

1145
  testWidgets("Material2 - LicensePage's color must be same whether loading or done", (WidgetTester tester) async {
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    const Color scaffoldColor = Color(0xFF123456);
    const Color cardColor = Color(0xFF654321);

    await tester.pumpWidget(MaterialApp(
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      theme: ThemeData.light(useMaterial3: false).copyWith(
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        scaffoldBackgroundColor: scaffoldColor,
        cardColor: cardColor,
      ),
      home: Scaffold(
        body: Center(
          child: Builder(
            builder: (BuildContext context) => GestureDetector(
              child: const Text('Show licenses'),
              onTap: () {
                showLicensePage(
                  context: context,
                  applicationName: 'MyApp',
                  applicationVersion: '1.0.0',
                );
1165
              },
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            ),
          ),
        ),
      ),
    ));

    await tester.tap(find.text('Show licenses'));
    await tester.pump();
    await tester.pump();

    // Check color when loading.
    final List<Material> materialLoadings = tester.widgetList<Material>(find.byType(Material)).toList();
    expect(materialLoadings.length, equals(4));
    expect(materialLoadings[1].color, scaffoldColor);
    expect(materialLoadings[2].color, cardColor);

    await tester.pumpAndSettle();

    // Check color when done.
    expect(find.byKey(const ValueKey<ConnectionState>(ConnectionState.done)), findsOneWidget);
    final List<Material> materialDones = tester.widgetList<Material>(find.byType(Material)).toList();
    expect(materialDones.length, equals(3));
    expect(materialDones[0].color, scaffoldColor);
    expect(materialDones[1].color, cardColor);
  });
1191

1192
  testWidgets("Material3 - LicensePage's color must be same whether loading or done", (WidgetTester tester) async {
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    const Color scaffoldColor = Color(0xFF123456);
    const Color cardColor = Color(0xFF654321);

    await tester.pumpWidget(MaterialApp(
      theme: ThemeData.light(useMaterial3: true).copyWith(
        scaffoldBackgroundColor: scaffoldColor,
        cardColor: cardColor,
      ),
      home: Scaffold(
        body: Center(
          child: Builder(
            builder: (BuildContext context) => GestureDetector(
              child: const Text('Show licenses'),
              onTap: () {
                showLicensePage(
                  context: context,
                  applicationName: 'MyApp',
                  applicationVersion: '1.0.0',
                );
              },
            ),
          ),
        ),
      ),
    ));

    await tester.tap(find.text('Show licenses'));
    await tester.pump();
    await tester.pump();

    // Check color when loading.
    final List<Material> materialLoadings = tester.widgetList<Material>(find.byType(Material)).toList();
    expect(materialLoadings.length, equals(5));
    expect(materialLoadings[1].color, scaffoldColor);
    expect(materialLoadings[2].color, cardColor);

    await tester.pumpAndSettle();

    // Check color when done.
    expect(find.byKey(const ValueKey<ConnectionState>(ConnectionState.done)), findsOneWidget);
    final List<Material> materialDones = tester.widgetList<Material>(find.byType(Material)).toList();
    expect(materialDones.length, equals(4));
    expect(materialDones[0].color, scaffoldColor);
    expect(materialDones[1].color, cardColor);
  });

1239
  testWidgets('Conflicting scrollbars are not applied by ScrollBehavior to _PackageLicensePage', (WidgetTester tester) async {
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    // Regression test for https://github.com/flutter/flutter/issues/83819
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['AAA'], 'BBB'),
      ]);
    });

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

    // Check for packages.
    expect(find.text('AAA'), findsOneWidget);
    // Check license is displayed after entering into license page for 'AAA'.
    await tester.tap(find.text('AAA'));
1260
    await tester.pumpAndSettle();
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    // The inherited ScrollBehavior should not apply Scrollbars since they are
    // already built in to the widget.
    switch (debugDefaultTargetPlatformOverride) {
      case TargetPlatform.android:
      case TargetPlatform.fuchsia:
      case TargetPlatform.linux:
      case TargetPlatform.macOS:
      case TargetPlatform.windows:
        expect(find.byType(CupertinoScrollbar), findsNothing);
      case TargetPlatform.iOS:
        expect(find.byType(CupertinoScrollbar), findsOneWidget);
      case null:
        break;
    }
    expect(find.byType(Scrollbar), findsOneWidget);
    expect(find.byType(RawScrollbar), findsNothing);

  }, variant: TargetPlatformVariant.all());
1280

1281
  testWidgets('ListView of license entries is primary', (WidgetTester tester) async {
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    // Regression test for https://github.com/flutter/flutter/issues/120710
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
         LicenseEntryWithLineBreaks(
          <String>['AAA'],
          // Add enough content to scroll
          List<String>.generate(500, (int index) => 'BBBB').join('\n'),
        ),
      ]);
    });

    await tester.pumpWidget(
      MaterialApp(
        title: 'Flutter Code Sample',
        home: Scaffold(
          body: Builder(
            builder: (BuildContext context) => TextButton(
              child: const Text('Show License Page'),
              onPressed: () {
                showLicensePage(context: context);
              },
            ),
          ),
        ),
      )
    );
    await tester.pumpAndSettle();

    expect(find.text('Show License Page'), findsOneWidget);
    await tester.tap(find.text('Show License Page'));
    await tester.pumpAndSettle();

    // Check for packages.
    expect(find.text('AAA'), findsOneWidget);
    // Check license is displayed after entering into license page for 'AAA'.
    await tester.tap(find.text('AAA'));
    await tester.pumpAndSettle();

    // The inherited ScrollBehavior should not apply Scrollbars since they are
    // already built in to the widget.
    switch (debugDefaultTargetPlatformOverride) {
      case TargetPlatform.android:
      case TargetPlatform.fuchsia:
      case TargetPlatform.linux:
      case TargetPlatform.macOS:
      case TargetPlatform.windows:
        expect(find.byType(CupertinoScrollbar), findsNothing);
      case TargetPlatform.iOS:
        expect(find.byType(CupertinoScrollbar), findsOneWidget);
      case null:
        break;
    }
    expect(find.byType(Scrollbar), findsOneWidget);
    expect(find.byType(RawScrollbar), findsNothing);
    await tester.drag(find.byType(ListView), const Offset(0.0, 20.0));
    await tester.pumpAndSettle(); // No exception triggered.
  }, variant: TargetPlatformVariant.all());

1340
  testWidgets('LicensePage padding', (WidgetTester tester) async {
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    const FlutterLogo logo = FlutterLogo();

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

    final Finder appName = find.text('LicensePage test app');
    final Finder appIcon = find.byType(FlutterLogo);
    final Finder appVersion = find.text('0.1.2');
    final Finder appLegalese = find.text('I am the very model of a modern major general.');
    final Finder appPowered = find.text('Powered by Flutter');

    expect(appName, findsOneWidget);
    expect(appIcon, findsOneWidget);
    expect(appVersion, findsOneWidget);
    expect(appLegalese, findsOneWidget);
    expect(appPowered, findsOneWidget);

    // Bottom padding is applied to the app version and app legalese text.
    final double appNameBottomPadding = tester.getTopLeft(appIcon).dy - tester.getBottomLeft(appName).dy;
    expect(appNameBottomPadding, 0.0);

    final double appIconBottomPadding = tester.getTopLeft(appVersion).dy - tester.getBottomLeft(appIcon).dy;
    expect(appIconBottomPadding, 0.0);

    final double appVersionBottomPadding = tester.getTopLeft(appLegalese).dy - tester.getBottomLeft(appVersion).dy;
    expect(appVersionBottomPadding, 18.0);

    final double appLegaleseBottomPadding = tester.getTopLeft(appPowered).dy - tester.getBottomLeft(appLegalese).dy;
    expect(appLegaleseBottomPadding, 18.0);
  });

1383
  testWidgets('LicensePage has no extra padding between app icon and app powered text', (WidgetTester tester) async {
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    // This is a regression test for https://github.com/flutter/flutter/issues/99559

    const FlutterLogo logo = FlutterLogo();

    await tester.pumpWidget(
      const MaterialApp(
        title: 'Pirate app',
        home: Center(
          child: LicensePage(
            applicationIcon: logo,
          ),
        ),
      ),
    );

    final Finder appName = find.text('LicensePage test app');
    final Finder appIcon = find.byType(FlutterLogo);
    final Finder appVersion = find.text('0.1.2');
    final Finder appLegalese = find.text('I am the very model of a modern major general.');
    final Finder appPowered = find.text('Powered by Flutter');

    expect(appName, findsNothing);
    expect(appIcon, findsOneWidget);
    expect(appVersion, findsNothing);
    expect(appLegalese, findsNothing);
    expect(appPowered, findsOneWidget);

    // Padding between app icon and app powered text.
    final double appIconBottomPadding = tester.getTopLeft(appPowered).dy - tester.getBottomLeft(appIcon).dy;
    expect(appIconBottomPadding, 18.0);
  });
1415

1416
  testWidgets('Material2 - Error handling test', (WidgetTester tester) async {
1417
    LicenseRegistry.addLicense(() => Stream<LicenseEntry>.error(Exception('Injected failure')));
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    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: false),
        home: const Material(child: AboutListTile())
      )
    );
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    await tester.tap(find.byType(ListTile));
    await tester.pump();
    await tester.pump(const Duration(seconds: 2));
    await tester.tap(find.text('VIEW LICENSES'));
    await tester.pump();
    await tester.pump(const Duration(seconds: 2));
    final Finder finder = find.byWidgetPredicate((Widget widget) => widget.runtimeType.toString() == '_PackagesView');
    // force the stream to complete (has to be done in a runAsync block since it's areal async process)
1432
    await tester.runAsync(() => (tester.firstState(finder) as dynamic).licenses as Future<dynamic>);
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    expect(tester.takeException().toString(), 'Exception: Injected failure');
    await tester.pumpAndSettle();
    expect(tester.takeException().toString(), 'Exception: Injected failure');
    expect(find.text('Exception: Injected failure'), findsOneWidget);
  });
1438

1439
  testWidgets('Material3 - Error handling test', (WidgetTester tester) async {
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    LicenseRegistry.addLicense(() => Stream<LicenseEntry>.error(Exception('Injected failure')));
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        home: const Material(child: AboutListTile())
      )
    );
    await tester.tap(find.byType(ListTile));
    await tester.pump();
    await tester.pump(const Duration(seconds: 2));
    await tester.tap(find.text('View licenses'));
    await tester.pump();
    await tester.pump(const Duration(seconds: 2));
    final Finder finder = find.byWidgetPredicate((Widget widget) => widget.runtimeType.toString() == '_PackagesView');
    // force the stream to complete (has to be done in a runAsync block since it's areal async process)
1455
    await tester.runAsync(() => (tester.firstState(finder) as dynamic).licenses as Future<dynamic>);
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    expect(tester.takeException().toString(), 'Exception: Injected failure');
    await tester.pumpAndSettle();
    expect(tester.takeException().toString(), 'Exception: Injected failure');
    expect(find.text('Exception: Injected failure'), findsOneWidget);
  });

1462
  testWidgets('Material2 - LicensePage master view layout position - ltr', (WidgetTester tester) async {
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    const TextDirection textDirection = TextDirection.ltr;
    const Size defaultSize = Size(800.0, 600.0);
    const Size wideSize = Size(1200.0, 600.0);
    const String title = 'License ABC';
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
      ]);
    });

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    addTearDown(() async {
      await tester.binding.setSurfaceSize(null);
    });

1477 1478 1479 1480
    // Configure to show the default layout.
    await tester.binding.setSurfaceSize(defaultSize);

    await tester.pumpWidget(
1481 1482
      MaterialApp(
        theme: ThemeData(useMaterial3: false),
1483
        title: title,
1484
        home: const Scaffold(
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          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

1493
    await tester.pumpAndSettle(); // Finish rendering the page.
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    // If the layout width is less than 840.0 pixels, nested layout is
    // used which positions license page title at the top center.
    Offset titleOffset = tester.getCenter(find.text(title));
    expect(titleOffset, Offset(defaultSize.width / 2, 92.0));
    expect(tester.getCenter(find.byType(ListView)), Offset(defaultSize.width / 2, 328.0));

    // Configure a wide window to show the lateral UI.
    await tester.binding.setSurfaceSize(wideSize);

    await tester.pumpWidget(
      const MaterialApp(
        title: title,
        home: Scaffold(
          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

1516
    await tester.pumpAndSettle(); // Finish rendering the page.
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    // If the layout width is greater than 840.0 pixels, lateral UI layout
    // is used which positions license page title and packageList
    // at the top left.
    titleOffset = tester.getTopRight(find.text(title));
    expect(titleOffset, const Offset(292.0, 136.0));
    expect(titleOffset.dx, lessThan(wideSize.width - 320)); // Default master view width is 320.0.
    expect(tester.getCenter(find.byType(ListView)), const Offset(160, 356));
1525 1526
  });

1527
  testWidgets('Material3 - LicensePage master view layout position - ltr', (WidgetTester tester) async {
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    const TextDirection textDirection = TextDirection.ltr;
    const Size defaultSize = Size(800.0, 600.0);
    const Size wideSize = Size(1200.0, 600.0);
    const String title = 'License ABC';
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
      ]);
    });

    addTearDown(() async {
      await tester.binding.setSurfaceSize(null);
    });
1541 1542 1543

    // Configure to show the default layout.
    await tester.binding.setSurfaceSize(defaultSize);
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    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        title: title,
        home: const Scaffold(
          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

    await tester.pumpAndSettle(); // Finish rendering the page.

    // If the layout width is less than 840.0 pixels, nested layout is
    // used which positions license page title at the top center.
    Offset titleOffset = tester.getCenter(find.text(title));
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    if (!kIsWeb || isCanvasKit) { // https://github.com/flutter/flutter/issues/99933
      expect(titleOffset, Offset(defaultSize.width / 2, 96.0));
    }
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    expect(tester.getCenter(find.byType(ListView)), Offset(defaultSize.width / 2, 328.0));

    // Configure a wide window to show the lateral UI.
    await tester.binding.setSurfaceSize(wideSize);

    await tester.pumpWidget(
      const MaterialApp(
        title: title,
        home: Scaffold(
          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

    await tester.pumpAndSettle(); // Finish rendering the page.

    // If the layout width is greater than 840.0 pixels, lateral UI layout
    // is used which positions license page title and packageList
    // at the top left.
    titleOffset = tester.getTopRight(find.text(title));
    expect(titleOffset, const Offset(292.0, 136.0));
    expect(titleOffset.dx, lessThan(wideSize.width - 320)); // Default master view width is 320.0.
    expect(tester.getCenter(find.byType(ListView)), const Offset(160, 356));
1592
  });
1593

1594
  testWidgets('Material2 - LicensePage master view layout position - rtl', (WidgetTester tester) async {
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    const TextDirection textDirection = TextDirection.rtl;
    const Size defaultSize = Size(800.0, 600.0);
    const Size wideSize = Size(1200.0, 600.0);
    const String title = 'License ABC';
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
      ]);
    });

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    addTearDown(() async {
      await tester.binding.setSurfaceSize(null);
    });

1609 1610 1611 1612
    // Configure to show the default layout.
    await tester.binding.setSurfaceSize(defaultSize);

    await tester.pumpWidget(
1613 1614
      MaterialApp(
        theme: ThemeData(useMaterial3: false),
1615
        title: title,
1616
        home: const Scaffold(
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          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

1625
    await tester.pumpAndSettle(); // Finish rendering the page.
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    // If the layout width is less than 840.0 pixels, nested layout is
    // used which positions license page title at the top center.
    Offset titleOffset = tester.getCenter(find.text(title));
    expect(titleOffset, Offset(defaultSize.width / 2, 92.0));
    expect(tester.getCenter(find.byType(ListView)), Offset(defaultSize.width / 2, 328.0));

    // Configure a wide window to show the lateral UI.
    await tester.binding.setSurfaceSize(wideSize);

    await tester.pumpWidget(
      const MaterialApp(
        title: title,
        home: Scaffold(
          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

1648
    await tester.pumpAndSettle(); // Finish rendering the page.
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    // If the layout width is greater than 840.0 pixels, lateral UI layout
    // is used which positions license page title and packageList
    // at the top right.
    titleOffset = tester.getTopLeft(find.text(title));
    expect(titleOffset, const Offset(908.0, 136.0));
    expect(titleOffset.dx, greaterThan(wideSize.width - 320)); // Default master view width is 320.0.
    expect(tester.getCenter(find.byType(ListView)), const Offset(1040.0, 356.0));
1657 1658
  });

1659
  testWidgets('Material3 - LicensePage master view layout position - rtl', (WidgetTester tester) async {
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    const TextDirection textDirection = TextDirection.rtl;
    const Size defaultSize = Size(800.0, 600.0);
    const Size wideSize = Size(1200.0, 600.0);
    const String title = 'License ABC';
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
      ]);
    });

    addTearDown(() async {
      await tester.binding.setSurfaceSize(null);
    });
1673 1674 1675

    // Configure to show the default layout.
    await tester.binding.setSurfaceSize(defaultSize);
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    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(useMaterial3: true),
        title: title,
        home: const Scaffold(
          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

    await tester.pumpAndSettle(); // Finish rendering the page.

    // If the layout width is less than 840.0 pixels, nested layout is
    // used which positions license page title at the top center.
    Offset titleOffset = tester.getCenter(find.text(title));
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    if (!kIsWeb || isCanvasKit) { // https://github.com/flutter/flutter/issues/99933
      expect(titleOffset, Offset(defaultSize.width / 2, 96.0));
    }
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    expect(tester.getCenter(find.byType(ListView)), Offset(defaultSize.width / 2, 328.0));

    // Configure a wide window to show the lateral UI.
    await tester.binding.setSurfaceSize(wideSize);

    await tester.pumpWidget(
      const MaterialApp(
        title: title,
        home: Scaffold(
          body: Directionality(
            textDirection: textDirection,
            child: LicensePage(),
          ),
        ),
      ),
    );

    await tester.pumpAndSettle(); // Finish rendering the page.

    // If the layout width is greater than 840.0 pixels, lateral UI layout
    // is used which positions license page title and packageList
    // at the top right.
    titleOffset = tester.getTopLeft(find.text(title));
    expect(titleOffset, const Offset(908.0, 136.0));
    expect(titleOffset.dx, greaterThan(wideSize.width - 320)); // Default master view width is 320.0.
    expect(tester.getCenter(find.byType(ListView)), const Offset(1040.0, 356.0));
1724
  });
1725

1726
  testWidgets('License page title in lateral UI does not use AppBarTheme.foregroundColor', (WidgetTester tester) async {
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
    // This is a regression test for https://github.com/flutter/flutter/issues/108991
    final ThemeData theme = ThemeData(
      appBarTheme: const AppBarTheme(foregroundColor: Color(0xFFFFFFFF)),
      useMaterial3: true,
    );
    const String title = 'License ABC';
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
      ]);
    });

1739 1740 1741 1742
    addTearDown(() async {
      await tester.binding.setSurfaceSize(null);
    });

1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766
    // Configure a wide window to show the lateral UI.
    await tester.binding.setSurfaceSize(const Size(1200.0, 600.0));

    await tester.pumpWidget(
      MaterialApp(
        title: title,
        theme: theme,
        home: const Scaffold(
          body: LicensePage(),
        ),
      ),
    );

    await tester.pumpAndSettle(); // Finish rendering the page.

    final RenderParagraph renderParagraph = tester.renderObject(find.text('ABC').last) as RenderParagraph;

    // License page title should not use AppBarTheme's foregroundColor.
    expect(renderParagraph.text.style!.color, isNot(theme.appBarTheme.foregroundColor));

    // License page title in the lateral UI uses default text style color.
    expect(renderParagraph.text.style!.color, theme.textTheme.titleLarge!.color);
  });

1767
  testWidgets('License page default title text color in the nested UI', (WidgetTester tester) async {
1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
    // This is a regression test for https://github.com/flutter/flutter/issues/108991
    final ThemeData theme = ThemeData(useMaterial3: true);
    const String title = 'License ABC';
    LicenseRegistry.addLicense(() {
      return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
        const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
      ]);
    });

    await tester.pumpWidget(
      MaterialApp(
        title: title,
        theme: theme,
        home: const Scaffold(
          body: LicensePage(),
        ),
      ),
    );

    await tester.pumpAndSettle(); // Finish rendering the page.

    // Currently in the master view.
    expect(find.text('License ABC'), findsOneWidget);

    // Navigate to the license page.
    await tester.tap(find.text('ABC'));
    await tester.pumpAndSettle();

    // Master view is no longer visible.
    expect(find.text('License ABC'), findsNothing);

    final RenderParagraph renderParagraph = tester.renderObject(find.text('ABC').first) as RenderParagraph;
    expect(renderParagraph.text.style!.color, theme.textTheme.titleLarge!.color);
  });

  group('Material 2', () {
1804 1805 1806
    // These tests are only relevant for Material 2. Once Material 2
    // support is deprecated and the APIs are removed, these tests
    // can be deleted.
1807

1808
    testWidgets('License page default title text color in the nested UI', (WidgetTester tester) async {
1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
      // This is a regression test for https://github.com/flutter/flutter/issues/108991
      final ThemeData theme = ThemeData(useMaterial3: false);
      const String title = 'License ABC';
      LicenseRegistry.addLicense(() {
        return Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
          const LicenseEntryWithLineBreaks(<String>['ABC'], 'DEF'),
        ]);
      });

      await tester.pumpWidget(
        MaterialApp(
          title: title,
          theme: theme,
          home: const Scaffold(
            body: LicensePage(),
          ),
        ),
      );

      await tester.pumpAndSettle(); // Finish rendering the page.

      // Currently in the master view.
      expect(find.text('License ABC'), findsOneWidget);

      // Navigate to the license page.
      await tester.tap(find.text('ABC'));
      await tester.pumpAndSettle();

      // Master view is no longer visible.
      expect(find.text('License ABC'), findsNothing);

      final RenderParagraph renderParagraph = tester.renderObject(find.text('ABC').first) as RenderParagraph;
      expect(renderParagraph.text.style!.color, theme.primaryTextTheme.titleLarge!.color);
    });
  });
1844 1845 1846 1847 1848
}

class FakeLicenseEntry extends LicenseEntry {
  FakeLicenseEntry();

1849 1850
  bool get packagesCalled => _packagesCalled;
  bool _packagesCalled = false;
1851 1852

  @override
1853
  Iterable<LicenseParagraph> paragraphs = <LicenseParagraph>[];
1854 1855

  @override
1856 1857 1858
  Iterable<String> get packages {
    _packagesCalled = true;
    return <String>[];
1859
  }
1860
}
1861 1862 1863 1864 1865

class LicensePageObserver extends NavigatorObserver {
  int licensePageCount = 0;

  @override
1866
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
    if (route is MaterialPageRoute<dynamic>) {
      licensePageCount++;
    }
    super.didPush(route, previousRoute);
  }
}

class AboutDialogObserver extends NavigatorObserver {
  int dialogCount = 0;

  @override
1878
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
1879
    if (route is DialogRoute) {
1880 1881 1882 1883
      dialogCount++;
    }
    super.didPush(route, previousRoute);
  }
1884 1885 1886 1887 1888 1889 1890 1891

  @override
  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
    if (route is DialogRoute) {
      dialogCount--;
    }
    super.didPop(route, previousRoute);
  }
1892
}