diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index f0891b6..cdbae8c 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -337,6 +337,16 @@
   )
 )
 
+(deftest convertir-formato-impresion-09
+  (testing "Test 09 convertir-formato-impresion"
+    (is (=
+        (convertir-formato-impresion '("{} elevado a la {} es\t{}" 2.0 2 4.0))
+        '("%.0f elevado a la %d es\t%.0f" 2.0 2 4.0)
+        )
+    )
+  )
+)
+
 (deftest get-rust-formatters-01
   (testing "Test 01 get-rust-formatters"
     (is (=