snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

material_3_demo/test/component_screen_test.dart

@@ -0,0 +1,275 @@
+// 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);
+}