diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index 3c26311..a6d19a2 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -398,6 +398,16 @@
   )
 )
 
+(deftest convertir-formato-impresion-12
+  (testing "Test 12 convertir-formato-impresion"
+    (is (=
+        (convertir-formato-impresion '("{}" ""))
+        '("%s" "")
+    ))
+  )
+)
+
+
 (deftest get-rust-formatters-01
   (testing "Test 01 get-rust-formatters"
     (is (=