tests: add a test_ prefix to all files that contain actual tests

This will make it easier to differentiate with utility files, as the next change
will add sevral

tests/test_metacharacters.c

@@ -0,0 +1,67 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   metacharacters.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/02/06 15:21:00 by kcolin            #+#    #+#             */
+/*   Updated: 2025/02/11 18:32:01 by khais            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "../src/parser/matchers/metacharacter.h"
+#include <assert.h>
+#include <stdio.h>
+#include <unistd.h>
+
+void	test_metacharacters(void)
+{
+	dup2(STDERR_FILENO, STDIN_FILENO);
+	char c = 'a';
+	printf("not metachar:");
+	while (c != 'z')
+	{
+		printf("%c", c);
+		assert(!is_metacharacter(c));
+		c++;
+	}
+	c = 'A';
+	while (c != 'Z')
+	{
+		printf("%c", c);
+		assert(!is_metacharacter(c));
+		c++;
+	}
+	c = '0';
+	while (c != '9')
+	{
+		printf("%c", c);
+		assert(!is_metacharacter(c));
+		c++;
+	}
+	char	*not_metachars = ";[]{}*+=_-";
+	int		i = 0;
+	while (not_metachars[i] != '\0')
+	{
+		dprintf(STDERR_FILENO, "%c", not_metachars[i]);
+		assert(!is_metacharacter(not_metachars[i]));
+		i++;
+	}
+	char	*metachars = " \t\n|&()<>";
+	i = 0;
+	printf("\nmetachar:");
+	while (metachars[i] != '\0')
+	{
+		dprintf(STDERR_FILENO, "%c (%d) ", metachars[i], metachars[i]);
+		assert(is_metacharacter(metachars[i]));
+		i++;
+	}
+	printf("\n");
+}
+
+int	main(void)
+{
+	test_metacharacters();
+	return (0);
+}