diff --git a/Makefile b/Makefile
index 35d1a44..cff3a21 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 #    By: lalgarra <lalgarra@student.42madrid.com>   +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2025/10/03 18:03:12 by lalgarra          #+#    #+#              #
-#    Updated: 2025/10/04 11:40:48 by lalgarra         ###   ########.fr        #
+#    Updated: 2025/10/04 11:59:30 by lalgarra         ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -17,7 +17,7 @@ LIBDIR = ../repo_libft_algarra
 CFLAGS += -Wall -Wextra -Werror -g3 -iquote $(LIBDIR) 
 
 TESTS := ft_isalpha_test ft_isdigit_test ft_isalnum_test ft_isascii_test \
-	ft_isprint_test ft_toupper_test ft_tolower_test
+	ft_isprint_test ft_toupper_test ft_tolower_test ft_strlen_test
 
 %_test : %_test.c
 	$(CC) $(CFLAGS) $*_test.c -L$(LIBDIR) -lft -o $*_test
diff --git a/ft_strlen_expected.output b/ft_strlen_expected.output
new file mode 100644
index 0000000..56b09d8
--- /dev/null
+++ b/ft_strlen_expected.output
@@ -0,0 +1,3 @@
+ft_strlen(""): 0; strlen(): 0; are equal: 1
+ft_strlen("Iorem ipsum dolor"): 17; strlen(): 17; are equal: 1
+ft_strlen("Iorem ip"): 8; strlen(): 8; are equal: 1
diff --git a/ft_strlen_test.c b/ft_strlen_test.c
new file mode 100644
index 0000000..53607bd
--- /dev/null
+++ b/ft_strlen_test.c
@@ -0,0 +1,34 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlen_test.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lalgarra <lalgarra@student.42madrid.com>   +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/10/03 18:27:44 by lalgarra          #+#    #+#             */
+/*   Updated: 2025/10/04 12:15:34 by lalgarra         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+#include <stdio.h>
+#include <string.h>
+
+void	do_test(const char *buff)
+{
+	printf("ft_strlen(\"%s\"): %lu; strlen(): %lu; are equal: %i\r\n", 
+		buff, ft_strlen(buff), strlen(buff), ft_strlen(buff) == strlen(buff));
+}
+
+int		main(void)
+{
+	char	buff[255];
+
+	strcpy(buff, "");
+	do_test(buff);
+	strcpy(buff, "Iorem ipsum dolor");
+	do_test(buff);
+	strcpy(buff, "Iorem ip\0sum dolor");
+	do_test(buff);
+	return (0);
+}