diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index 91ede10..04704c5 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -425,6 +425,16 @@
   )
 )
 
+(deftest convertir-formato-impresion-15
+  (testing "Test 15 convertir-formato-impresion"
+    (is (=
+        (convertir-formato-impresion '("{}\t{}" 1 1))
+        '("%d\t%d" 1 1)
+    ))
+  )
+)
+
+
 (deftest get-rust-formatters-01
   (testing "Test 01 get-rust-formatters"
     (is (=