diff --git a/dev/a11y_assessments/lib/use_cases/text_button.dart b/dev/a11y_assessments/lib/use_cases/text_button.dart
index e39552af71..852a68f4dc 100644
--- a/dev/a11y_assessments/lib/use_cases/text_button.dart
+++ b/dev/a11y_assessments/lib/use_cases/text_button.dart
@@ -25,9 +25,8 @@ class MainWidget extends StatefulWidget {
 }
 
 class MainWidgetState extends State<MainWidget> {
-  int _count = 0;
-
   String pageTitle = getUseCaseName(TextButtonUseCase());
+  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
 
   @override
   Widget build(BuildContext context) {
@@ -36,35 +35,34 @@ class MainWidgetState extends State<MainWidget> {
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
         title: Semantics(headingLevel: 1, child: Text('$pageTitle Demo')),
       ),
-      body: Center(
+      body: Form(
+        key: _formKey,
         child: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
+          crossAxisAlignment: CrossAxisAlignment.start,
           children: <Widget>[
-            MergeSemantics(
-              child: Row(
-                mainAxisAlignment: MainAxisAlignment.center,
-                children: <Widget>[
-                  const Text('This is a TextButton:'),
-                  TextButton(
-                    onPressed: () {
-                      setState(() { _count++; });
-                    },
-                    child: const Text('Action'),
-                  ),
-                  Text('Clicked $_count time(s).'),
-                ],
-              ),
+            TextFormField(
+              // The validator receives the text that the user has entered.
+              validator: (String? value) {
+                if (value == null || value.isEmpty) {
+                  return 'Please enter some text';
+                }
+                return null;
+              },
             ),
-            const MergeSemantics(
-              child: Row(
-                mainAxisAlignment: MainAxisAlignment.center,
-                children: <Widget>[
-                  Text('This is a disabled TextButton:'),
-                  TextButton(
-                    onPressed: null,
-                    child: Text('Action Disabled'),
-                  ),
-                ],
+            Padding(
+              padding: const EdgeInsets.symmetric(vertical: 16),
+              child: ElevatedButton(
+                onPressed: () {
+                  // Validate returns true if the form is valid, or false otherwise.
+                  if (_formKey.currentState!.validate()) {
+                    // If the form is valid, display a snackbar. In the real world,
+                    // this might also send a request to a server.
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      const SnackBar(content: Text('Form submitted')),
+                    );
+                  }
+                },
+              child: const Text('Submit'),
               ),
             ),
           ],
diff --git a/dev/a11y_assessments/test/text_button_test.dart b/dev/a11y_assessments/test/text_button_test.dart
index e821a51ff3..4851a6adc0 100644
--- a/dev/a11y_assessments/test/text_button_test.dart
+++ b/dev/a11y_assessments/test/text_button_test.dart
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:a11y_assessments/use_cases/text_button.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import 'test_utils.dart';
@@ -10,22 +11,21 @@ import 'test_utils.dart';
 void main() {
   testWidgets('text button can run', (WidgetTester tester) async {
     await pumpsUseCase(tester, TextButtonUseCase());
-    expect(find.text('Action'), findsOneWidget);
-    expect(find.text('Action Disabled'), findsOneWidget);
+    expect(find.text('Submit'), findsOneWidget);
   });
 
-  testWidgets('text button increments correctly when clicked',
-      (WidgetTester tester) async {
+  testWidgets('submit causes snackbar to show', (WidgetTester tester) async {
     await pumpsUseCase(tester, TextButtonUseCase());
+    final Finder textFormField = find.byType(TextFormField);
+    final Finder submitButton = find.text('Submit');
 
-    expect(find.text('Action'), findsOneWidget);
-    await tester.tap(find.text('Action'));
-    await tester.pumpAndSettle();
-    expect(find.text('Clicked 1 time(s).'), findsOneWidget);
+    // Enter text in field and submit.
+    await tester.enterText(textFormField, 'test text');
+    await tester.tap(submitButton);
+    await tester.pump();
 
-    await tester.tap(find.text('Action'));
-    await tester.pumpAndSettle();
-    expect(find.text('Clicked 2 time(s).'), findsOneWidget);
+    // Verify that the snackbar is visible.
+    expect(find.text('Form submitted'), findsOneWidget);
   });
 
   testWidgets('text button demo page has one h1 tag', (WidgetTester tester) async {