diff --git a/test/convert/test_atou.c b/test/convert/test_atou.c
new file mode 100644
index 0000000..6f8e669
--- /dev/null
+++ b/test/convert/test_atou.c
@@ -0,0 +1,41 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_atou.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/08 10:20:37 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "color.h"
+#include "convert.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	const char	*str[] = {"", "0", "42", "-42", "+-42",
+		"2147483647", "\v\t13", "\r\n7"};
+	size_t		i;
+	char		*end;
+
+	i = 0;
+	while (i < 9)
+	{
+		if (ft_atou(str[i]) != strtoull(str[i], &end, 10))
+		{
+			dprintf(2, "%s✘ Found %zu, expected %llu%s\n", CLR_RED,
+				ft_atou(str[i]), strtoull(str[i], &end, 10), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		i++;
+	}
+	ft_atou(NULL);
+	printf("%s✔%s", CLR_GREEN, RESET);
+	puts("\n");
+}