fix test

Author: chunhtai

packages/go_router/example/lib/on_exit.dart

@@ -27,7 +27,6 @@ final GoRouter _router = GoRouter(
               context: context,
               builder: (_) {
                 return AlertDialog(
-                  title: const Text('Confirm'),
                   content: const Text('Are you sure to leave this page?'),
                   actions: <Widget>[
                     TextButton(

packages/go_router/example/test/on_exit_test.dart

@@ -24,6 +24,7 @@ void main() {
     await tester.tap(find.byType(BackButton));
     await tester.pumpAndSettle();
 
+    expect(find.text('Are you sure to leave this page?'), findsOneWidget);
     await tester.tap(find.text('Confirm'));
     await tester.pumpAndSettle();
     expect(find.byType(example.HomeScreen), findsOneWidget);