diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index 53e7ec6..4281be5 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -176,6 +176,12 @@
   )
 )
 
+(deftest identificador-test03
+  (testing "Test 03 identificador"
+    (is (= (identificador? 'e120) true))
+  )
+)
+
 (deftest palabra-reservada-test01
   (testing "Test 01 palabra reservada"
     (is (= (palabra-reservada? 'while) true))