diff --git a/tests/Makefile b/tests/Makefile
index b295b71..af97f60 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,4 +1,5 @@
 rawtests = \
+	env_manip \
 	metacharacters \
 
 tests = $(addprefix test_,$(rawtests))
diff --git a/tests/env_manip.c b/tests/env_manip.c
new file mode 100644
index 0000000..48f22df
--- /dev/null
+++ b/tests/env_manip.c
@@ -0,0 +1,31 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   env_manip.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/02/18 15:11:14 by khais             #+#    #+#             */
+/*   Updated: 2025/02/18 15:25:35 by khais            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "../src/env_manip.h"
+#include "libft.h"
+#include <assert.h>
+
+static void	test_envp_get_key(char *line, char *expected_key)
+{
+	char	*value = envp_get_key(line);
+	ft_dprintf(STDERR_FILENO, "for envp value '%s', expecting key to eq '%s', and got '%s'\n", line, expected_key, value);
+	assert(expected_key == value || ft_strcmp(expected_key, value) == 0);
+	free(value);
+}
+
+int main(void) {
+	test_envp_get_key("SHELL=/bin/fish", "SHELL");
+	test_envp_get_key("=/bin/fish", "");
+	test_envp_get_key(NULL, NULL);
+	test_envp_get_key("", NULL);
+	return (0);
+}