diff --git a/libft_test/ft_isalpha_test.c b/libft_test/ft_isalpha_test.c
index 88c35b4..4bcad63 100755
--- a/libft_test/ft_isalpha_test.c
+++ b/libft_test/ft_isalpha_test.c
@@ -57,29 +57,37 @@ static int expect_counter = 0;
 int ft_isalpha(int c);
 
 int main(){
-	test  (printf, "%d\n", ft_isalpha('a'));
-	expect(printf, "%d\n",    isalpha('a'));
-	test  (printf, "%d\n", ft_isalpha('A'));
-	expect(printf, "%d\n",    isalpha('A'));
-	test  (printf, "%d\n", ft_isalpha('m'));
-	expect(printf, "%d\n",    isalpha('m'));
-	test  (printf, "%d\n", ft_isalpha('M'));
-	expect(printf, "%d\n",    isalpha('M'));
-	test  (printf, "%d\n", ft_isalpha('z'));
-	expect(printf, "%d\n",    isalpha('z'));
-	test  (printf, "%d\n", ft_isalpha('Z'));
-	expect(printf, "%d\n",    isalpha('Z'));
-	test  (printf, "%d\n", ft_isalpha(0));
-	expect(printf, "%d\n",    isalpha(0));
-	test  (printf, "%d\n", ft_isalpha(1));
-	expect(printf, "%d\n",    isalpha(1));
-	test  (printf, "%d\n", ft_isalpha('a' - 1));
-	expect(printf, "%d\n",    isalpha('a' - 1));
-	test  (printf, "%d\n", ft_isalpha('A' - 1));
-	expect(printf, "%d\n",    isalpha('A' - 1));
-	test  (printf, "%d\n", ft_isalpha('z' + 1));
-	expect(printf, "%d\n",    isalpha('z' + 1));
-	test  (printf, "%d\n", ft_isalpha('Z' + 1));
-	expect(printf, "%d\n",    isalpha('Z' + 1));
+	int	arg;
+
+	arg = 'a';
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'A';
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'z';
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'Z';
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'm';
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'M';
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'a' - 1;
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'A' - 1
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'z' + 1;
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
+	arg = 'Z' + 1;
+	test  (printf, "%d\n", ft_isalpha(arg));
+	expect(printf, "%d\n",    isalpha(arg));
 	return 0;
-}
\ No newline at end of file
+}
diff --git a/libft_test/ft_isdigit_test.c b/libft_test/ft_isdigit_test.c
index 990b4cb..7776c45 100755
--- a/libft_test/ft_isdigit_test.c
+++ b/libft_test/ft_isdigit_test.c
@@ -57,31 +57,52 @@ static int expect_counter = 0;
 int ft_isdigit(int c);
 
 int main(){
-	test  (printf, "%d\n", ft_isdigit('0'));
-	expect(printf, "%d\n",    isdigit('0'));
-	test  (printf, "%d\n", ft_isdigit('1'));
-	expect(printf, "%d\n",    isdigit('1'));
-	test  (printf, "%d\n", ft_isdigit('2'));
-	expect(printf, "%d\n",    isdigit('2'));
-	test  (printf, "%d\n", ft_isdigit('3'));
-	expect(printf, "%d\n",    isdigit('3'));
-	test  (printf, "%d\n", ft_isdigit('4'));
-	expect(printf, "%d\n",    isdigit('4'));
-	test  (printf, "%d\n", ft_isdigit('5'));
-	expect(printf, "%d\n",    isdigit('5'));
-	test  (printf, "%d\n", ft_isdigit('6'));
-	expect(printf, "%d\n",    isdigit('6'));
-	test  (printf, "%d\n", ft_isdigit('7'));
-	expect(printf, "%d\n",    isdigit('7'));
-	test  (printf, "%d\n", ft_isdigit('8'));
-	expect(printf, "%d\n",    isdigit('8'));
-	test  (printf, "%d\n", ft_isdigit('9'));
-	expect(printf, "%d\n",    isdigit('9'));
-	test  (printf, "%d\n", ft_isdigit(0));
-	expect(printf, "%d\n",    isdigit(0));
-	test  (printf, "%d\n", ft_isdigit(1));
-	expect(printf, "%d\n",    isdigit(1));
-	test  (printf, "%d\n", ft_isdigit(127));
-	expect(printf, "%d\n",    isdigit(127));
+	int	arg;
+
+	arg = '0';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '1';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '2';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '3';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '4';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '5';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '6';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '7';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '8';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = '9';
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = 0;
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = 1;
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = 126;
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = 127;
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
+	arg = 128;
+	test  (printf, "%d\n", ft_isdigit(arg));
+	expect(printf, "%d\n",    isdigit(arg));
 	return 0;
-}
\ No newline at end of file
+}
diff --git a/libft_test/ft_isprint_test.c b/libft_test/ft_isprint_test.c
new file mode 100755
index 0000000..c9e2861
--- /dev/null
+++ b/libft_test/ft_isprint_test.c
@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+
+tmp_out="$(mktemp)"
+
+if [ -f "${0%_test.c}.c" ]; then
+	SRC="${0%_test.c}.c"
+else
+	SRC="$($(type -P basename) -- "${0%_test.c}.c")"
+fi
+grep -A9999 -- "[S]TART_OF_C_FILE" "${0}" | cc -Wall -Wextra -Werror -o "${tmp_out}" -xc "${SRC}" -
+
+if [ ! "${?}" = "0" ] || [ ! -f "${tmp_out}" ]; then
+  printf "\e[101;37m%s\e[m\n" "Could not compile"
+  exit 1
+fi
+
+printf "%s\n" "Testing ${SRC}"
+printf "Expected --> Success\n"
+diff --expand-tabs --left-column --width="60" --side-by-side --label="Expected Output" --label="    Test Output" -- <("${tmp_out}" 2>&1 1>/dev/null) <("${tmp_out}" 2>/dev/null) && { printf "\e[102;30m%s\e[m\n" "All tests passed"; exit_status="0"; } || { printf "\e[101;37m%s\e[m\n" "At least one test failed"; exit_status="1"; }
+rm -f -- "${tmp_out}"
+
+exit -- "${exit_status}"
+// START_OF_C_FILE
+#include <stdio.h>
+#include <unistd.h>
+
+static int test_counter = 0;
+static int expect_counter = 0;
+
+#define test(func, ...) \
+    do { \
+        int old_stderr_fd = dup(2); \
+        dup2(1, 2); \
+        fprintf(stdout, "Case %d:", test_counter++); \
+        fflush(stdout); \
+        func(__VA_ARGS__); \
+        fflush(stderr); \
+        fflush(stdout); \
+        dup2(old_stderr_fd, 2); \
+    } while(0)
+
+#define expect(func, ...) \
+    do { \
+        int old_stdout_fd = dup(1); \
+        dup2(2, 1); \
+        fprintf(stderr, "Case %d:", expect_counter++); \
+        fflush(stderr); \
+        func(__VA_ARGS__); \
+        fflush(stderr); \
+        fflush(stdout); \
+        dup2(old_stdout_fd, 1); \
+    } while(0)
+// END_TEMPLATE
+
+#include <ctype.h>
+#include <limits.h>
+
+int ft_isprint(int c);
+
+int main(){
+	int arg;
+
+	arg = -1;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 0;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 1;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 20;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 31;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 32;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 33;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 120;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 126;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 127;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = 128;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = INT_MAX;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	arg = INT_MIN;
+	test  (printf, "%d\n", ft_isprint(arg));
+	expect(printf, "%d\n",    isprint(arg));
+	return 0;
+}