diff --git a/dev/bots/check_code_samples.dart b/dev/bots/check_code_samples.dart
index c1191814be..2d6820d078 100644
--- a/dev/bots/check_code_samples.dart
+++ b/dev/bots/check_code_samples.dart
@@ -312,7 +312,6 @@ final Set<String> _knownMissingTests = <String>{
   'examples/api/test/material/selectable_region/selectable_region.0_test.dart',
   'examples/api/test/material/color_scheme/dynamic_content_color.0_test.dart',
   'examples/api/test/material/platform_menu_bar/platform_menu_bar.0_test.dart',
-  'examples/api/test/material/navigation_rail/navigation_rail.extended_animation.0_test.dart',
   'examples/api/test/painting/star_border/star_border.0_test.dart',
   'examples/api/test/widgets/navigator/navigator.restorable_push_and_remove_until.0_test.dart',
   'examples/api/test/widgets/navigator/navigator.restorable_push.0_test.dart',
diff --git a/examples/api/test/material/navigation_rail/navigation_rail.extended_animation.0_test.dart b/examples/api/test/material/navigation_rail/navigation_rail.extended_animation.0_test.dart
new file mode 100644
index 0000000000..c0cf89412a
--- /dev/null
+++ b/examples/api/test/material/navigation_rail/navigation_rail.extended_animation.0_test.dart
@@ -0,0 +1,65 @@
+// 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/material/navigation_rail/navigation_rail.extended_animation.0.dart'
+    as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Navigation rail animates itself between the normal and extended state',
+    (WidgetTester tester) async {
+      await tester.pumpWidget(
+        const example.ExtendedAnimationExampleApp(),
+      );
+
+      expect(find.text('Tap on FloatingActionButton to expand'), findsOne);
+      expect(find.widgetWithIcon(FloatingActionButton, Icons.add), findsOne);
+      expect(find.byIcon(Icons.favorite), findsOne);
+      expect(find.text('First'), findsOne);
+      expect(find.byIcon(Icons.bookmark_border), findsOne);
+      expect(find.text('Second'), findsOne);
+      expect(find.byIcon(Icons.star_border), findsOne);
+      expect(find.text('First'), findsOne);
+
+      // The navigation rail should be in the normal state.
+      expect(
+        tester.getCenter(find.byType(FloatingActionButton)),
+        offsetMoreOrLessEquals(const Offset(40, 36), epsilon: 0.1),
+      );
+      expect(find.widgetWithText(FloatingActionButton, 'CREATE'), findsNothing);
+
+      // Expand the navigation rail.
+      await tester.tap(find.byType(FloatingActionButton));
+      await tester.pump();
+      await tester.pump(kThemeAnimationDuration * 0.5);
+      expect(
+        tester.getCenter(find.byType(FloatingActionButton)),
+        offsetMoreOrLessEquals(const Offset(128.1, 36), epsilon: 0.1),
+      );
+
+      await tester.pump(kThemeAnimationDuration * 0.5);
+      expect(
+        tester.getCenter(find.byType(FloatingActionButton)),
+        offsetMoreOrLessEquals(const Offset(132, 36), epsilon: 0.1),
+      );
+      expect(find.widgetWithText(FloatingActionButton, 'CREATE'), findsOne);
+
+      // Collapse the navigation rail.
+      await tester.tap(find.byType(FloatingActionButton));
+      await tester.pump();
+      await tester.pump(kThemeAnimationDuration * 0.5);
+      expect(
+        tester.getCenter(find.byType(FloatingActionButton)),
+        offsetMoreOrLessEquals(const Offset(128.1, 36), epsilon: 0.1),
+      );
+
+      await tester.pump(kThemeAnimationDuration * 0.5);
+      expect(
+        tester.getCenter(find.byType(FloatingActionButton)),
+        offsetMoreOrLessEquals(const Offset(40, 36), epsilon: 0.1),
+      );
+      expect(find.widgetWithText(FloatingActionButton, 'CREATE'), findsNothing);
+  });
+}