refactor duplicate code into single visitor

pkg/analysis_server/test/services/completion/test_all.dart

Index: pkg/analysis_server/test/services/completion/test_all.dart
diff --git a/pkg/analysis_server/test/services/completion/test_all.dart b/pkg/analysis_server/test/services/completion/test_all.dart
index 5770bb46053c9a603d62682cb0004a0f8be5b147..622643c767190df82f85fd10f9b434a680b55bec 100644
--- a/pkg/analysis_server/test/services/completion/test_all.dart
+++ b/pkg/analysis_server/test/services/completion/test_all.dart
@@ -14,6 +14,7 @@ import 'imported_computer_test.dart' as imported_test;
 import 'invocation_computer_test.dart' as invocation_test;
 import 'keyword_computer_test.dart' as keyword_test;
 import 'local_computer_test.dart' as local_test;
+import 'optype_ast_visitor_test.dart' as optype_visitor_test;
 
 /// Utility for manually running all tests.
 main() {
@@ -27,5 +28,6 @@ main() {
     keyword_test.main();
     invocation_test.main();
     local_test.main();
+    optype_visitor_test.main();
   });
 }