samples/material_3_demo/test/component_screen_test.dart

// Copyright 2021 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// ignore_for_file: avoid_types_on_closure_parameters
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:material_3_demo/main.dart';
import 'package:material_3_demo/src/component_screen.dart';

void main() {
  testWidgets('Default main page shows all M3 components', (tester) async {
    widgetSetup(tester, 800, windowHeight: 7500);
    await tester.pumpWidget(const App());

    // Elements on the app bar
    expect(find.text('Material 3'), findsOneWidget);
    expect(
      find.widgetWithIcon(AppBar, Icons.dark_mode_outlined),
      findsOneWidget,
    );
    expect(find.widgetWithIcon(AppBar, Icons.filter_2), findsOneWidget);
    expect(
      find.widgetWithIcon(AppBar, Icons.palette_outlined),
      findsOneWidget,
    );

    // Elements on the component screen
    // Common buttons
    expect(
      find.widgetWithText(ElevatedButton, 'Elevated'),
      findsNWidgets(2),
    );
    expect(find.widgetWithText(FilledButton, 'Filled'), findsNWidgets(2));
    expect(
      find.widgetWithText(FilledButton, 'Filled tonal'),
      findsNWidgets(2),
    );
    expect(
      find.widgetWithText(OutlinedButton, 'Outlined'),
      findsNWidgets(2),
    );
    expect(find.widgetWithText(TextButton, 'Text'), findsNWidgets(2));
    expect(find.widgetWithText(Buttons, 'Icon'), findsNWidgets(5));

    // FABs
    expect(
      find.byType(FloatingActionButton),
      findsNWidgets(6),
    ); // 2 more show up in the bottom app bar. 1 more in the navigation rail
    expect(
      find.widgetWithText(FloatingActionButton, 'Create'),
      findsOneWidget,
    );

    // Icon buttons
    expect(
      find.widgetWithIcon(IconButton, Icons.settings_outlined),
      findsNWidgets(8),
    );

    // Segmented buttons
    expect(find.byType(SegmentedButton<Calendar>), findsOneWidget);
    expect(find.byType(SegmentedButton<Sizes>), findsOneWidget);

    // Badges
    expect(find.byType(Badge), findsNWidgets(4));

    // Progress indicators
    Finder circularProgressIndicator = find.byType(
      CircularProgressIndicator,
    );
    expect(circularProgressIndicator, findsOneWidget);
    Finder linearProgressIndicator = find.byType(LinearProgressIndicator);
    expect(linearProgressIndicator, findsOneWidget);

    // Snackbar
    expect(
      find.widgetWithText(TextButton, 'Show snackbar'),
      findsOneWidget,
    );

    // Bottom sheet
    expect(
      find.widgetWithText(TextButton, 'Show modal bottom sheet'),
      findsOneWidget,
    );
    expect(
      find.widgetWithText(TextButton, 'Show bottom sheet'),
      findsOneWidget,
    );

    // Cards
    expect(find.widgetWithText(Cards, 'Elevated'), findsOneWidget);
    expect(find.widgetWithText(Cards, 'Filled'), findsOneWidget);
    expect(find.widgetWithText(Cards, 'Outlined'), findsOneWidget);

    // Carousels
    expect(find.byType(CarouselView), findsNWidgets(2));

    // Dialogs
    expect(find.widgetWithText(TextButton, 'Show dialog'), findsOneWidget);
    expect(
      find.widgetWithText(TextButton, 'Show full-screen dialog'),
      findsOneWidget,
    );

    // Dividers
    expect(find.byKey(const Key('divider')), findsOneWidget);

    // Bottom app bar
    expect(find.byType(BottomAppBar), findsOneWidget);

    // Navigation bar
    // Third one is off screen in the scaffold
    expect(find.byType(NavigationBar), findsNWidgets(3));

    // Navigation drawer
    expect(find.byType(Drawer), findsOneWidget);
    expect(
      find.widgetWithText(TextButton, 'Show modal navigation drawer'),
      findsOneWidget,
    );

    // Navigation rail
    // Second one is off screen in the scaffold
    expect(find.byType(NavigationRail), findsNWidgets(2));

    // Tabs
    expect(find.byType(TabBar), findsOneWidget);

    // Search
    expect(find.byType(SearchBar), findsOneWidget);

    // Top app bars
    expect(find.byType(AppBar), findsNWidgets(6));

    // Checkboxes
    Finder checkboxExample = find.byType(CheckboxListTile);
    expect(checkboxExample, findsNWidgets(4));

    // Chips
    expect(
      find.byType(ActionChip),
      findsNWidgets(4),
    ); // includes Assist and Suggestion chip.
    expect(find.byType(FilterChip), findsNWidgets(2));
    expect(find.byType(InputChip), findsNWidgets(2));

    // Date and time pickers
    expect(
      find.widgetWithText(DatePicker, 'Show date picker'),
      findsOneWidget,
    );
    expect(
      find.widgetWithText(TimePicker, 'Show time picker'),
      findsOneWidget,
    );

    // Menus
    expect(find.byType(MenuAnchor), findsNWidgets(5));
    expect(find.byType(DropdownMenu<ColorLabel>), findsOneWidget);
    expect(find.byType(DropdownMenu<IconLabel>), findsOneWidget);

    // Radios
    Finder radioExample = find.byType(RadioListTile<Options>);
    expect(radioExample, findsNWidgets(3));

    // Sliders
    expect(find.byType(Slider), findsNWidgets(2));

    // Switches
    expect(find.byType(Switch), findsNWidgets(4));

    // TextFields
    expect(find.widgetWithText(TextField, 'Disabled'), findsNWidgets(2));
    expect(find.widgetWithText(TextField, 'Filled'), findsNWidgets(2));
    expect(find.widgetWithText(TextField, 'Outlined'), findsNWidgets(2));
  });

  testWidgets(
    'NavigationRail doesn\'t show when width value is small than 1000 '
    '(in Portrait mode or narrow screen)',
    (tester) async {
      widgetSetup(tester, 999, windowHeight: 7000);
      await tester.pumpWidget(const App());
      await tester.pumpAndSettle();

      // When screen width is less than 1000, NavigationBar will show. At the same
      // time, the NavigationBar example still show up in the navigation group.
      expect(
        find.byType(NavigationBars),
        findsNWidgets(3),
      ); // The real navBar, badges example and navBar example
      expect(
        find.widgetWithText(NavigationBar, 'Components'),
        findsOneWidget,
      );
      expect(find.widgetWithText(NavigationBar, 'Color'), findsOneWidget);
      expect(
        find.widgetWithText(NavigationBar, 'Typography'),
        findsOneWidget,
      );
      expect(
        find.widgetWithText(NavigationBar, 'Elevation'),
        findsOneWidget,
      );

      expect(
        find.widgetWithText(NavigationBar, 'Explore'),
        findsOneWidget,
      );
      expect(find.widgetWithText(NavigationBar, 'Pets'), findsOneWidget);
      expect(
        find.widgetWithText(NavigationBar, 'Account'),
        findsOneWidget,
      );
    },
  );

  testWidgets(
    'NavigationRail shows when width value is greater than or equal '
    'to 1000 (in Landscape mode or wider screen)',
    (tester) async {
      widgetSetup(tester, 1001, windowHeight: 3000);
      await tester.pumpWidget(const App());
      await tester.pumpAndSettle();

      // When screen width is greater than or equal to 1000, NavigationRail will show.
      // At the same time, the NavigationBar will NOT show.
      expect(find.byType(NavigationRail), findsNWidgets(2));
      expect(find.byType(Tooltip, skipOffstage: false), findsWidgets);
      expect(
        find.widgetWithText(NavigationRail, 'Components'),
        findsOneWidget,
      );
      expect(find.widgetWithText(NavigationRail, 'Color'), findsOneWidget);
      expect(
        find.widgetWithText(NavigationRail, 'Typography'),
        findsOneWidget,
      );
      expect(
        find.widgetWithText(NavigationRail, 'Elevation'),
        findsOneWidget,
      );

      expect(
        find.widgetWithText(NavigationBar, 'Explore'),
        findsOneWidget,
      );
      expect(find.widgetWithText(NavigationBar, 'Pets'), findsOneWidget);
      expect(
        find.widgetWithText(NavigationBar, 'Account'),
        findsOneWidget,
      );

      // the Navigation bar should be out of screen.
      final RenderBox box = tester.renderObject(
        find.widgetWithText(NavigationBar, 'Components'),
      );
      expect(box.localToGlobal(Offset.zero), const Offset(0.0, 3080.0));
    },
  );
}

void widgetSetup(
  WidgetTester tester,
  double windowWidth, {
  double? windowHeight,
}) {
  final height = windowHeight ?? 846;
  tester.view.devicePixelRatio = 2;
  final dpi = tester.view.devicePixelRatio;
  tester.view.physicalSize = Size(windowWidth * dpi, height * dpi);
}