diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index 04704c5..2851bf8 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -434,6 +434,14 @@
   )
 )
 
+(deftest convertir-formato-impresion-16
+  (testing "Test 16 convertir-formato-impresion"
+    (is (=
+        (convertir-formato-impresion '("{}\t{}" 1 \a))
+        '("%d\t%c" 1 \a)
+    ))
+  )
+)
 
 (deftest get-rust-formatters-01
   (testing "Test 01 get-rust-formatters"