diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index 308db39..f844d19 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -816,3 +816,12 @@
     ))
   )
 )
+
+(deftest test-cargar-en-ult-reg-02
+  (testing "Test 02 cargar-en-ult-reg"
+    (is (=
+      (cargar-en-ult-reg [[['String "2"] ['i64 6] ['i64 2] ['i64 3] ['i64 0]] [['i64 nil] ['i64 0]]] 0 'f64 3)
+      [[['String "2"] ['i64 6] ['i64 2] ['i64 3] ['i64 0]] [['f64 3] ['i64 0]]]
+    ))
+  )
+)