diff --git a/pkg/analysis_server/test/src/services/refactoring/move_top_level_to_file_test.dart b/pkg/analysis_server/test/src/services/refactoring/move_top_level_to_file_test.dart
index a117ccced9e..5e964588066 100644
--- a/pkg/analysis_server/test/src/services/refactoring/move_top_level_to_file_test.dart
+++ b/pkg/analysis_server/test/src/services/refactoring/move_top_level_to_file_test.dart
@@ -1053,6 +1053,31 @@ class ClassToMove {}
 >>>>>>>>>> lib/main.dart
 class A {}
 
+class B {}
+''';
+    await _singleDeclaration(
+      originalSource: originalSource,
+      expected: expected,
+      declarationName: declarationName,
+    );
+  }
+
+  Future<void> test_kind_extensionType() async {
+    var originalSource = '''
+class A {}
+
+extensionType ExtensionTypeToMove^(int i) {}
+
+class B {}
+''';
+    var declarationName = 'ExtensionTypeToMove';
+
+    var expected = '''
+>>>>>>>>>> lib/extension_type_to_move.dart created
+extensionType ExtensionTypeToMove(int i) {}
+>>>>>>>>>> lib/main.dart
+class A {}
+
 class B {}
 ''';
     await _singleDeclaration(