Add tests for shared_app_data.#.dart API examples. (#147830)

This PR contributes to https://github.com/flutter/flutter/issues/130459

### Description
- Updates `examples/api/lib/widgets/shared_app_data/shared_app_data.0.dart` to meet latest API examples structure
- Updates `examples/api/lib/widgets/shared_app_data/shared_app_data.1.dart` to meet latest API examples structure
- Adds tests for `examples/api/lib/widgets/shared_app_data/shared_app_data.0.dart`
- Adds tests for `examples/api/lib/widgets/shared_app_data/shared_app_data.1.dart`

dev/bots/check_code_samples.dart

@@ -384,8 +384,6 @@ final Set<String> _knownMissingTests = <String>{
   'examples/api/test/widgets/inherited_theme/inherited_theme.0_test.dart',
   'examples/api/test/widgets/sliver/decorated_sliver.0_test.dart',
   'examples/api/test/widgets/autofill/autofill_group.0_test.dart',
-  'examples/api/test/widgets/shared_app_data/shared_app_data.1_test.dart',
-  'examples/api/test/widgets/shared_app_data/shared_app_data.0_test.dart',
   'examples/api/test/widgets/nested_scroll_view/nested_scroll_view_state.0_test.dart',
   'examples/api/test/widgets/nested_scroll_view/nested_scroll_view.2_test.dart',
   'examples/api/test/widgets/nested_scroll_view/nested_scroll_view.1_test.dart',

examples/api/lib/widgets/shared_app_data/shared_app_data.0.dart

@@ -6,38 +6,41 @@ import 'package:flutter/material.dart';
 
 /// Flutter code sample for [SharedAppData].
 
-class ShowSharedValue extends StatelessWidget {
-  const ShowSharedValue({super.key, required this.appDataKey});
+void main() {
+  runApp(const SharedAppDataExampleApp());
+}
 
-  final String appDataKey;
+class SharedAppDataExampleApp extends StatelessWidget {
+  const SharedAppDataExampleApp({super.key});
 
   @override
   Widget build(BuildContext context) {
-    // The SharedAppData.getValue() call causes this widget to depend on the
-    // value of the SharedAppData's 'foo' key. If it's changed, with
-    // SharedAppData.setValue(), then this widget will be rebuilt.
-    final String value = SharedAppData.getValue<String, String>(context, appDataKey, () => 'initial');
-    return Text('$appDataKey: $value');
+    return const MaterialApp(
+      home: SharedAppDataExample(),
+    );
   }
 }
 
 // Demonstrates that changes to the SharedAppData _only_ cause the dependent
 // widgets to be rebuilt. In this case that's the ShowSharedValue widget that's
 // displaying the value of a key whose value has been updated.
-class Home extends StatefulWidget {
-  const Home({super.key});
+class SharedAppDataExample extends StatefulWidget {
+  const SharedAppDataExample({super.key});
 
   @override
-  State<Home> createState() => _HomeState();
+  State<SharedAppDataExample> createState() => _SharedAppDataExampleState();
 }
 
-class _HomeState extends State<Home> {
+class _SharedAppDataExampleState extends State<SharedAppDataExample> {
   int _fooVersion = 0;
   int _barVersion = 0;
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      appBar: AppBar(
+        title: const Text('SharedAppData Sample'),
+      ),
       body: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,
@@ -50,10 +53,13 @@ class _HomeState extends State<Home> {
               child: const Text('change foo'),
               onPressed: () {
                 _fooVersion += 1;
-                // Changing the SharedAppData's value for 'foo' causes the
-                // widgets that depend on 'foo' to be rebuilt.
+                // Changing the SharedAppData's value for 'foo' key causes the
+                // widgets that depend on 'foo' key to be rebuilt.
                 SharedAppData.setValue<String, String?>(
-                    context, 'foo', 'FOO $_fooVersion'); // no need to call setState()
+                  context,
+                  'foo',
+                  'FOO $_fooVersion',
+                ); // No need to call setState().
               },
             ),
             const SizedBox(height: 16),
@@ -61,8 +67,13 @@ class _HomeState extends State<Home> {
               child: const Text('change bar'),
               onPressed: () {
                 _barVersion += 1;
+                // Changing the SharedAppData's value for 'bar' key causes the
+                // widgets that depend on 'bar' key to be rebuilt.
                 SharedAppData.setValue<String, String?>(
-                    context, 'bar', 'BAR $_barVersion'); // no need to call setState()
+                  context,
+                  'bar',
+                  'BAR $_barVersion',
+                ); // No need to call setState().
               },
             ),
           ],
@@ -72,6 +83,22 @@ class _HomeState extends State<Home> {
   }
 }
 
-void main() {
-  runApp(const MaterialApp(home: Home()));
+class ShowSharedValue extends StatelessWidget {
+  const ShowSharedValue({super.key, required this.appDataKey});
+
+  final String appDataKey;
+
+  @override
+  Widget build(BuildContext context) {
+    // The SharedAppData.getValue() call causes this widget to depend on the
+    // value of the SharedAppData's key. If it's changed, with
+    // SharedAppData.setValue(), then this widget will be rebuilt.
+    final String value = SharedAppData.getValue<String, String>(
+      context,
+      appDataKey,
+      () => 'initial',
+    );
+
+    return Text('$appDataKey: $value');
+  }
 }

examples/api/lib/widgets/shared_app_data/shared_app_data.1.dart

@@ -7,27 +7,34 @@ import 'package:flutter/material.dart';
 
 /// Flutter code sample for [SharedAppData].
 
-// A single lazily-constructed object that's shared with the entire application
-// via `SharedObject.of(context)`. The value of the object can be changed with
-// `SharedObject.reset(context)`. Resetting the value will cause all of the
-// widgets that depend on it to be rebuilt.
-class SharedObject {
-  SharedObject._();
+void main() {
+  runApp(const SharedAppDataExampleApp());
+}
 
-  static final Object _sharedObjectKey = Object();
+class SharedAppDataExampleApp extends StatelessWidget {
+  const SharedAppDataExampleApp({super.key});
 
   @override
-  String toString() => describeIdentity(this);
-
-  static void reset(BuildContext context) {
-    // Calling SharedAppData.setValue() causes dependent widgets to be rebuilt.
-    SharedAppData.setValue<Object, SharedObject>(context, _sharedObjectKey, SharedObject._());
+  Widget build(BuildContext context) {
+    return const MaterialApp(
+      home: SharedAppDataExample(),
+    );
   }
+}
 
-  static SharedObject of(BuildContext context) {
-    // If a value for _sharedObjectKey has never been set then the third
-    // callback parameter is used to generate an initial value.
-    return SharedAppData.getValue<Object, SharedObject>(context, _sharedObjectKey, () => SharedObject._());
+class SharedAppDataExample extends StatelessWidget {
+  const SharedAppDataExample({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('SharedAppData Sample'),
+      ),
+      body: const Center(
+        child: CustomWidget(),
+      ),
+    );
   }
 }
 
@@ -48,17 +55,34 @@ class CustomWidget extends StatelessWidget {
   }
 }
 
-class Home extends StatelessWidget {
-  const Home({super.key});
+// A single lazily-constructed object that's shared with the entire application
+// via `SharedObject.of(context)`. The value of the object can be changed with
+// `SharedObject.reset(context)`. Resetting the value will cause all of the
+// widgets that depend on it to be rebuilt.
+class SharedObject {
+  SharedObject._();
+
+  static final Object _sharedObjectKey = Object();
 
   @override
-  Widget build(BuildContext context) {
-    return const Scaffold(
-      body: Center(child: CustomWidget()),
+  String toString() => describeIdentity(this);
+
+  static void reset(BuildContext context) {
+    // Calling SharedAppData.setValue() causes dependent widgets to be rebuilt.
+    SharedAppData.setValue<Object, SharedObject>(
+      context,
+      _sharedObjectKey,
+      SharedObject._(),
+    );
+  }
+
+  static SharedObject of(BuildContext context) {
+    // If a value for _sharedObjectKey has never been set then the third
+    // callback parameter is used to generate an initial value.
+    return SharedAppData.getValue<Object, SharedObject>(
+      context,
+      _sharedObjectKey,
+      () => SharedObject._(),
     );
   }
 }
-
-void main() {
-  runApp(const MaterialApp(home: Home()));
-}

examples/api/test/widgets/shared_app_data/shared_app_data.0_test.dart

@@ -0,0 +1,100 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_api_samples/widgets/shared_app_data/shared_app_data.0.dart'
+    as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Verify correct labels are displayed', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.SharedAppDataExampleApp(),
+    );
+
+    expect(find.text('SharedAppData Sample'), findsOneWidget);
+    expect(find.text('foo: initial'), findsOneWidget);
+    expect(find.text('bar: initial'), findsOneWidget);
+    expect(find.text('change foo'), findsOneWidget);
+    expect(find.text('change bar'), findsOneWidget);
+  });
+
+  testWidgets('foo value can be updated', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.SharedAppDataExampleApp(),
+    );
+
+    int counter = 0;
+
+    while (counter < 10) {
+      counter++;
+
+      await tester.tap(find.ancestor(
+        of: find.text('change foo'),
+        matching: find.byType(ElevatedButton),
+      ));
+      await tester.pump();
+
+      expect(find.text('foo: FOO $counter'), findsOneWidget);
+    }
+  });
+
+  testWidgets('bar value can be updated', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.SharedAppDataExampleApp(),
+    );
+
+    int counter = 0;
+
+    while (counter < 10) {
+      counter++;
+
+      await tester.tap(find.ancestor(
+        of: find.text('change bar'),
+        matching: find.byType(ElevatedButton),
+      ));
+      await tester.pump();
+
+      expect(find.text('bar: BAR $counter'), findsOneWidget);
+    }
+  });
+
+  testWidgets('foo and bar values update independently of one another', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.SharedAppDataExampleApp(),
+    );
+
+    int fooCounter = 0;
+    int barCounter = 0;
+
+    for (int i = 0; i < 20; i++) {
+      if (i.isEven) {
+        fooCounter++;
+      } else {
+        barCounter++;
+      }
+
+      await tester.tap(
+        find.ancestor(
+          of: i.isEven ? find.text('change foo') : find.text('change bar'),
+          matching: find.byType(ElevatedButton),
+        ),
+      );
+      await tester.pump();
+
+      expect(
+        find.text(
+          'foo: ${fooCounter == 0 ? 'initial' : 'FOO $fooCounter'}',
+        ),
+        findsOneWidget,
+      );
+      expect(
+        find.text(
+          'bar: ${barCounter == 0 ? 'initial' : 'BAR $barCounter'}',
+        ),
+        findsOneWidget,
+      );
+    }
+  });
+}

examples/api/test/widgets/shared_app_data/shared_app_data.1_test.dart

@@ -0,0 +1,48 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_api_samples/widgets/shared_app_data/shared_app_data.1.dart'
+    as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  example.SharedObject getSharedObject(WidgetTester tester) {
+    final BuildContext context = tester.element(
+      find.byType(example.CustomWidget),
+    );
+    return example.SharedObject.of(context);
+  }
+
+  testWidgets('Verify correct labels are displayed', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.SharedAppDataExampleApp(),
+    );
+
+    final example.SharedObject sharedObject = getSharedObject(tester);
+
+    expect(find.text('SharedAppData Sample'), findsOneWidget);
+    expect(find.text('Replace $sharedObject'), findsOneWidget);
+  });
+
+  testWidgets('Button tap resets SharedObject', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.SharedAppDataExampleApp(),
+    );
+
+    for (int i = 0; i < 10; i++) {
+      final example.SharedObject sharedObject = getSharedObject(tester);
+
+      final Finder buttonFinder = find.ancestor(
+        of: find.text('Replace $sharedObject'),
+        matching: find.byType(ElevatedButton),
+      );
+
+      expect(buttonFinder, findsOneWidget);
+
+      await tester.tap(buttonFinder);
+      await tester.pump();
+    }
+  });
+}