Add tests for action_listener.0.dart (flutter#150606)

Contributes to flutter#130459

It adds a test for
- `examples/api/lib/widgets/actions/action_listener.0.dart`

Author: ValentinVignal

dev/bots/check_code_samples.dart

@@ -378,7 +378,6 @@ final Set<String> _knownMissingTests = <String>{
   'examples/api/test/widgets/single_child_scroll_view/single_child_scroll_view.1_test.dart',
   'examples/api/test/widgets/single_child_scroll_view/single_child_scroll_view.0_test.dart',
   'examples/api/test/widgets/restoration/restoration_mixin.0_test.dart',
-  'examples/api/test/widgets/actions/action_listener.0_test.dart',
   'examples/api/test/widgets/actions/focusable_action_detector.0_test.dart',
   'examples/api/test/widgets/focus_scope/focus_scope.0_test.dart',
   'examples/api/test/widgets/scroll_view/custom_scroll_view.1_test.dart',

examples/api/test/widgets/actions/action_listener.0_test.dart

@@ -0,0 +1,50 @@
+// 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/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_api_samples/widgets/actions/action_listener.0.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('ActionListener can be enabled, triggered, and disabled', (WidgetTester tester) async {
+    final List<String?> log = <String?>[];
+
+    final DebugPrintCallback originalDebugPrint = debugPrint;
+    debugPrint = (String? message, {int? wrapWidth}) {
+      log.add(message);
+    };
+    try {
+      await tester.pumpWidget(
+        const example.ActionListenerExampleApp(),
+      );
+
+      expect(find.widgetWithText(AppBar, 'ActionListener Sample'), findsOne);
+      expect(find.widgetWithText(OutlinedButton, 'Enable'), findsOne);
+
+      await tester.tap(find.byType(OutlinedButton));
+      await tester.pump();
+
+      expect(find.widgetWithText(OutlinedButton, 'Disable'), findsOne);
+      expect(find.widgetWithText(ElevatedButton, 'Call Action Listener'), findsOne);
+      expect(log, const <String?>['Action Listener was added']);
+
+      await tester.tap(find.text('Call Action Listener'));
+      await tester.pumpAndSettle();
+
+      expect(find.widgetWithText(SnackBar, 'Action Listener Called'), findsOne);
+
+      await tester.tap(find.text('Disable'));
+      await tester.pump();
+
+      expect(find.widgetWithText(OutlinedButton, 'Enable'), findsOne);
+      expect(
+        log,
+        const <String?>['Action Listener was added', 'Action Listener was removed'],
+      );
+    } finally {
+      debugPrint = originalDebugPrint;
+    }
+  });
+}