diff --git a/ft_strjoin_expected.output b/ft_strjoin_expected.output
new file mode 100644
index 0000000..a83e0bb
--- /dev/null
+++ b/ft_strjoin_expected.output
@@ -0,0 +1,4 @@
+test 1: str1:[Lorem], str2:[ ipsum], result:[Lorem ipsum]
+test 2: str1:[], str2:[ ipsum], result:[ ipsum]
+test 3: str1:[Lorem], str2:[], result:[Lorem]
+test 4: str1:[Lorem], str2:[-NULL-], result:[Lorem]
diff --git a/ft_strjoin_test.c b/ft_strjoin_test.c
index 50f83cf..aa641c6 100644
--- a/ft_strjoin_test.c
+++ b/ft_strjoin_test.c
@@ -6,7 +6,7 @@
 /*   By: lalgarra <lalgarra@student.42madrid.com>   +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/08 20:21:32 by lalgarra          #+#    #+#             */
-/*   Updated: 2025/10/08 20:25:32 by lalgarra         ###   ########.fr       */
+/*   Updated: 2025/10/08 20:41:28 by lalgarra         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,6 +16,14 @@
 #include <stdio.h>
 #include <string.h>
 
+static void ft_putstr_fd1(char *res, int fd)
+{
+	if (res == NULL)
+		ft_putstr_fd("-NULL-", fd);
+	else
+		ft_putstr_fd(res, fd);
+}
+
 static void	test(char *prefix, char *str1, char *str2)
 {
 	char	*res;
@@ -24,15 +32,12 @@ static void	test(char *prefix, char *str1, char *str2)
 	fd = STDOUT_FILENO;
 	ft_putstr_fd(prefix, fd);
 	ft_putstr_fd("str1:[", fd);
-	ft_putstr_fd(str1, fd);
-	ft_putstr_fd("str2:[", fd);
-	ft_putstr_fd(str2, fd);
+	ft_putstr_fd1(str1, fd);
+	ft_putstr_fd("], str2:[", fd);
+	ft_putstr_fd1(str2, fd);
 	res = ft_strjoin(str1, str2);
 	ft_putstr_fd("], result:[", fd);
-	if (res == NULL)
-		ft_putstr_fd("-NULL-", fd);
-	else
-		ft_putstr_fd(res, fd);
+	ft_putstr_fd1(res, fd);
 	free(res);
 	ft_putendl_fd("]", fd);
 }