diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index dd05d50..3c26311 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -389,6 +389,15 @@
   )
 )
 
+(deftest convertir-formato-impresion-11
+  (testing "Test 11 convertir-formato-impresion"
+    (is (=
+        (convertir-formato-impresion '("Hola mundo! {}" ""))
+        '("Hola mundo! %s" "")
+    ))
+  )
+)
+
 (deftest get-rust-formatters-01
   (testing "Test 01 get-rust-formatters"
     (is (=