Update misc tests for Material3 (#128712)

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

@@ -78,30 +78,29 @@ class _ApplicationExitControlState extends State<ApplicationExitControl> {
     return Center(
       child: SizedBox(
         width: 300,
-        child: IntrinsicHeight(
-          child: Column(
-            children: <Widget>[
-              RadioListTile<bool>(
-                title: const Text('Do Not Allow Exit'),
-                groupValue: _shouldExit,
-                value: false,
-                onChanged: _radioChanged,
-              ),
-              RadioListTile<bool>(
-                title: const Text('Allow Exit'),
-                groupValue: _shouldExit,
-                value: true,
-                onChanged: _radioChanged,
-              ),
-              const SizedBox(height: 30),
-              ElevatedButton(
-                onPressed: _quit,
-                child: const Text('Quit'),
-              ),
-              const SizedBox(height: 30),
-              Text('Exit Request: $_lastExitResponse'),
-            ],
-          ),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: <Widget>[
+            RadioListTile<bool>(
+              title: const Text('Do Not Allow Exit'),
+              groupValue: _shouldExit,
+              value: false,
+              onChanged: _radioChanged,
+            ),
+            RadioListTile<bool>(
+              title: const Text('Allow Exit'),
+              groupValue: _shouldExit,
+              value: true,
+              onChanged: _radioChanged,
+            ),
+            const SizedBox(height: 30),
+            ElevatedButton(
+              onPressed: _quit,
+              child: const Text('Quit'),
+            ),
+            const SizedBox(height: 30),
+            Text('Exit Request: $_lastExitResponse'),
+          ],
         ),
       ),
     );

packages/flutter_test/test/accessibility_test.dart

@@ -275,11 +275,12 @@ void main() {
       handle.dispose();
     });
 
-    testWidgets('yellow text on yellow background fails with correct message',
+    testWidgets('Material2: yellow text on yellow background fails with correct message',
         (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
       await tester.pumpWidget(
         _boilerplate(
+          useMaterial3: false,
           Container(
             width: 200.0,
             height: 200.0,
@@ -306,6 +307,38 @@ void main() {
       handle.dispose();
     });
 
+    testWidgets('Material3: yellow text on yellow background fails with correct message',
+        (WidgetTester tester) async {
+      final SemanticsHandle handle = tester.ensureSemantics();
+      await tester.pumpWidget(
+        _boilerplate(
+          useMaterial3: true,
+          Container(
+            width: 200.0,
+            height: 200.0,
+            color: Colors.yellow,
+            child: const Text(
+              'this is a test',
+              style: TextStyle(fontSize: 14.0, color: Colors.yellowAccent),
+            ),
+          ),
+        ),
+      );
+      final Evaluation result = await textContrastGuideline.evaluate(tester);
+      expect(result.passed, false);
+      expect(
+        result.reason,
+        'SemanticsNode#4(Rect.fromLTRB(300.0, 200.0, 500.0, 400.0), '
+        'label: "this is a test", textDirection: ltr):\n'
+        'Expected contrast ratio of at least 4.5 but found 1.19 for a font '
+        'size of 14.0.\n'
+        'The computed colors was:\n'
+        'light - Color(0xfffffbfe), dark - Color(0xffffeb3b)\n'
+         'See also: https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html',
+      );
+      handle.dispose();
+    });
+
     testWidgets('label without corresponding text is skipped',
         (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
@@ -937,5 +970,11 @@ void main() {
   });
 }
 
-Widget _boilerplate(Widget child) =>
-  MaterialApp(home: Scaffold(body: Center(child: child)));
+Widget _boilerplate(Widget child, { bool? useMaterial3 }) {
+  return MaterialApp(
+    theme: ThemeData(useMaterial3: useMaterial3),
+    home: Scaffold(
+      body: Center(child: child),
+    ),
+  );
+}