Add more widgets to a11y assessment app (#152662)

## Pre-launch Checklist

- [ ] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [ ] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [ ] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [ ] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [ ] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [ ] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

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[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

dev/a11y_assessments/lib/use_cases/action_chip.dart

@@ -0,0 +1,54 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class ActionChipUseCase extends UseCase {
+  @override
+  String get name => 'ActionChip';
+
+  @override
+  String get route => '/action-chip';
+
+  @override
+  Widget build(BuildContext context) => const MainWidget();
+}
+
+class MainWidget extends StatefulWidget {
+  const MainWidget({super.key});
+
+  @override
+  State<MainWidget> createState() => MainWidgetState();
+}
+
+class MainWidgetState extends State<MainWidget> {
+  bool favorite = false;
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('ActionChip'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            ActionChip(
+              avatar: const Icon(Icons.favorite),
+              label: const Text('Action'),
+              onPressed: () {},
+            ),
+            const ActionChip(
+              avatar: Icon(Icons.favorite),
+              label: Text('Action'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/card.dart

@@ -0,0 +1,51 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class CardUseCase extends UseCase {
+  @override
+  String get name => 'Card';
+
+  @override
+  String get route => '/card';
+
+  @override
+  Widget build(BuildContext context) => const MainWidget();
+}
+
+class MainWidget extends StatefulWidget {
+  const MainWidget({super.key});
+
+  @override
+  State<MainWidget> createState() => MainWidgetState();
+}
+
+class MainWidgetState extends State<MainWidget> {
+  bool favorite = false;
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('Card'),
+      ),
+      body: const Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            Card(
+              child: Padding(
+                padding: EdgeInsets.all(16),
+                child: Text('Card'),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/expansion_tile.dart

@@ -0,0 +1,74 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class ExpansionTileUseCase extends UseCase {
+  @override
+  String get name => 'ExpansionTile';
+
+  @override
+  String get route => '/expansion-tile';
+
+  @override
+  Widget build(BuildContext context) => const ExpansionTileExample();
+}
+
+
+class ExpansionTileExample extends StatefulWidget {
+  const ExpansionTileExample({super.key});
+
+  @override
+  State<ExpansionTileExample> createState() => _ExpansionTileExampleState();
+}
+
+class _ExpansionTileExampleState extends State<ExpansionTileExample> {
+  bool _customTileExpanded = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('ExpansionTile'),
+      ),
+      body: Column(
+        children: <Widget>[
+          const ExpansionTile(
+            title: Text('ExpansionTile 1'),
+            subtitle: Text('Trailing expansion arrow icon'),
+            children: <Widget>[
+              ListTile(title: Text('This is tile number 1')),
+            ],
+          ),
+          ExpansionTile(
+            title: const Text('ExpansionTile 2'),
+            subtitle: const Text('Custom expansion arrow icon'),
+            trailing: Icon(
+              _customTileExpanded ? Icons.arrow_drop_down_circle : Icons.arrow_drop_down,
+            ),
+            children: const <Widget>[
+              ListTile(title: Text('This is tile number 2')),
+            ],
+            onExpansionChanged: (bool expanded) {
+              setState(() {
+                _customTileExpanded = expanded;
+              });
+            },
+          ),
+          const ExpansionTile(
+            title: Text('ExpansionTile 3'),
+            subtitle: Text('Leading expansion arrow icon'),
+            controlAffinity: ListTileControlAffinity.leading,
+            children: <Widget>[
+              ListTile(title: Text('This is tile number 3')),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/snack_bar.dart

@@ -0,0 +1,67 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class SnackBarUseCase extends UseCase {
+  @override
+  String get name => 'SnackBar';
+
+  @override
+  String get route => '/snack-bar';
+
+  @override
+  Widget build(BuildContext context) => const MainWidget();
+}
+
+class MainWidget extends StatefulWidget {
+  const MainWidget({super.key});
+
+  @override
+  State<MainWidget> createState() => MainWidgetState();
+}
+
+class MainWidgetState extends State<MainWidget> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('SnackBar'),
+      ),
+      body: Center(
+        child: Column(
+          children: <Widget>[
+            ElevatedButton(
+              child: const Text('Show Snackbar'),
+              onPressed: () {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  const SnackBar(
+                    content: Text('Awesome Snackbar!'),
+                  ),
+                );
+              },
+            ),
+            ElevatedButton(
+              child: const Text('Show Snackbar with action '),
+              onPressed: () {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  SnackBar(
+                    content: const Text('Awesome Snackbar!'),
+                    action: SnackBarAction(
+                      label: 'Action',
+                      onPressed: () {},
+                    ),
+                  ),
+                );
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/switch_list_tile.dart

@@ -0,0 +1,66 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class SwitchListTileUseCase extends UseCase {
+  @override
+  String get name => 'SwitchListTile';
+
+  @override
+  String get route => '/switch-list-tile';
+
+  @override
+  Widget build(BuildContext context) => const SwitchListTileExample();
+}
+
+class SwitchListTileExample extends StatefulWidget {
+  const SwitchListTileExample({super.key});
+
+  @override
+  State<SwitchListTileExample> createState() => _SwitchListTileExampleState();
+}
+
+class _SwitchListTileExampleState extends State<SwitchListTileExample> {
+  bool _lights1 = false;
+  bool _lights2 = false;
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('SwitchListTile'),
+      ),
+      body: Center(
+        child: Column(
+          children: <Widget>[
+            SwitchListTile(
+              title: const Text('Lights'),
+              value: _lights1,
+              onChanged: (bool value) {
+                setState(() {
+                  _lights1 = value;
+                });
+              },
+              secondary: const Icon(Icons.lightbulb_outline),
+            ),
+            SwitchListTile(
+              title: const Text('Lights'),
+              subtitle: const Text('Subtitle'),
+              value: _lights2,
+              onChanged: (bool value) {
+                setState(() {
+                  _lights2 = value;
+                });
+              },
+              secondary: const Icon(Icons.lightbulb_outline),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/use_cases.dart

@@ -4,15 +4,20 @@
 
 import 'package:flutter/widgets.dart';
 
+import 'action_chip.dart';
 import 'auto_complete.dart';
 import 'badge.dart';
+import 'card.dart';
 import 'check_box_list_tile.dart';
 import 'date_picker.dart';
 import 'dialog.dart';
+import 'expansion_tile.dart';
 import 'material_banner.dart';
 import 'navigation_bar.dart';
 import 'radio_list_tile.dart';
 import 'slider.dart';
+import 'snack_bar.dart';
+import 'switch_list_tile.dart';
 import 'text_button.dart';
 import 'text_field.dart';
 import 'text_field_password.dart';
@@ -36,4 +41,9 @@ final List<UseCase> useCases = <UseCase>[
   NavigationBarUseCase(),
   TextButtonUseCase(),
   RadioListTileUseCase(),
+  ActionChipUseCase(),
+  SnackBarUseCase(),
+  SwitchListTileUseCase(),
+  ExpansionTileUseCase(),
+  CardUseCase(),
 ];

dev/a11y_assessments/test/action_chip_test.dart

@@ -0,0 +1,16 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:a11y_assessments/use_cases/action_chip.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'test_utils.dart';
+
+void main() {
+  testWidgets('action chip can run', (WidgetTester tester) async {
+    await pumpsUseCase(tester, ActionChipUseCase());
+    expect(find.byType(ActionChip), findsExactly(2));
+  });
+}

dev/a11y_assessments/test/card_test.dart

@@ -0,0 +1,16 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:a11y_assessments/use_cases/card.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'test_utils.dart';
+
+void main() {
+  testWidgets('card can run', (WidgetTester tester) async {
+    await pumpsUseCase(tester, CardUseCase());
+    expect(find.byType(Card), findsExactly(1));
+  });
+}

dev/a11y_assessments/test/expansion_tile_test.dart

@@ -0,0 +1,16 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:a11y_assessments/use_cases/expansion_tile.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'test_utils.dart';
+
+void main() {
+  testWidgets('action chip can run', (WidgetTester tester) async {
+    await pumpsUseCase(tester, ExpansionTileUseCase());
+    expect(find.byType(ExpansionTile), findsExactly(3));
+  });
+}

dev/a11y_assessments/test/snack_bar_test.dart

@@ -0,0 +1,20 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:a11y_assessments/use_cases/snack_bar.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'test_utils.dart';
+
+void main() {
+  testWidgets('snack bar can run', (WidgetTester tester) async {
+    await pumpsUseCase(tester,  SnackBarUseCase());
+    const String snackBarText = 'Awesome Snackbar!';
+    expect(find.text(snackBarText), findsNothing);
+    await tester.tap(find.text('Show Snackbar'));
+    expect(find.text(snackBarText), findsNothing);
+    await tester.pump();
+    expect(find.text(snackBarText), findsOneWidget);
+  });
+}

dev/a11y_assessments/test/switch_list_tile_test.dart

@@ -0,0 +1,16 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:a11y_assessments/use_cases/switch_list_tile.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'test_utils.dart';
+
+void main() {
+  testWidgets('action chip can run', (WidgetTester tester) async {
+    await pumpsUseCase(tester, SwitchListTileUseCase());
+    expect(find.byType(SwitchListTile), findsExactly(2));
+  });
+}