echo: manage backslashes

tests/techo.c

@@ -0,0 +1,42 @@
+/*
+** EPITECH PROJECT, 2020
+** test_echo.c
+** File description:
+** techo
+*/
+
+#include <criterion/redirect.h>
+#include <criterion/criterion.h>
+#include "builtin.h"
+
+Test(echo, normal_message, .init = cr_redirect_stdout)
+{
+    env_t env = {};
+    char *av[] = {"echo", "hello", NULL};
+    builtin_echo(av, &env);
+    cr_assert_stdout_eq_str("hello\n");
+}
+
+Test(echo, with_simple_backslash, .init = cr_redirect_stdout)
+{
+    env_t env = {};
+    char *av[] = {"echo", "\\n", NULL};
+    builtin_echo(av, &env);
+    cr_assert_stdout_eq_str("n\n");
+}
+
+Test(echo, with_double_backslash, .init = cr_redirect_stdout)
+{
+    env_t env = {};
+    char *av[] = {"echo", "\\\\n", NULL};
+    builtin_echo(av, &env);
+    cr_assert_stdout_eq_str("\\n\n");
+}
+
+Test(echo, multiple_args, .init = cr_redirect_stdout)
+{
+    env_t env = {};
+    char *av[] = {"echo", "Hello", "I\'m", "Marvin", NULL};
+    builtin_echo(av, &env);
+    cr_assert_stdout_eq_str("Hello I\'m Marvin\n");
+}