From a8f7e6e83bc4846c94c0489e0f6e0f807b35073e Mon Sep 17 00:00:00 2001
From: Thomas Vanbesien <tvanbesi@proton.me>
Date: Sat, 21 Feb 2026 16:29:51 +0100
Subject: Implement libft Part 2 with tests

Add ft_substr, ft_strjoin, ft_strtrim, ft_split, ft_itoa,
ft_strmapi, ft_striteri, ft_putchar_fd, ft_putstr_fd,
ft_putendl_fd, ft_putnbr_fd.
---
 tests/src/test_itoa.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 tests/src/test_itoa.c

(limited to 'tests/src/test_itoa.c')

diff --git a/tests/src/test_itoa.c b/tests/src/test_itoa.c
new file mode 100644
index 0000000..17cafe3
--- /dev/null
+++ b/tests/src/test_itoa.c
@@ -0,0 +1,99 @@
+#include "libft.h"
+#include "test_utils.h"
+#include <limits.h>
+
+static void
+_s_test_itoa (void)
+{
+  int i;
+  char label[128];
+  char expected[64];
+
+  _s_section ("ft_itoa");
+
+  /* zero */
+  {
+    char *p = ft_itoa (0);
+    _s_check ("zero", p && strcmp (p, "0") == 0);
+    free (p);
+  }
+
+  /* positive */
+  {
+    char *p = ft_itoa (42);
+    _s_check ("positive", p && strcmp (p, "42") == 0);
+    free (p);
+  }
+
+  /* negative */
+  {
+    char *p = ft_itoa (-42);
+    _s_check ("negative", p && strcmp (p, "-42") == 0);
+    free (p);
+  }
+
+  /* INT_MAX */
+  {
+    char *p = ft_itoa (INT_MAX);
+    snprintf (expected, sizeof (expected), "%d", INT_MAX);
+    _s_check ("INT_MAX", p && strcmp (p, expected) == 0);
+    free (p);
+  }
+
+  /* INT_MIN */
+  {
+    char *p = ft_itoa (INT_MIN);
+    snprintf (expected, sizeof (expected), "%d", INT_MIN);
+    _s_check ("INT_MIN", p && strcmp (p, expected) == 0);
+    free (p);
+  }
+
+  /* single digit positive */
+  {
+    char *p = ft_itoa (7);
+    _s_check ("single digit", p && strcmp (p, "7") == 0);
+    free (p);
+  }
+
+  /* single digit negative */
+  {
+    char *p = ft_itoa (-1);
+    _s_check ("neg single digit", p && strcmp (p, "-1") == 0);
+    free (p);
+  }
+
+  /* powers of ten */
+  {
+    char *p;
+
+    p = ft_itoa (10);
+    _s_check ("10", p && strcmp (p, "10") == 0);
+    free (p);
+    p = ft_itoa (100);
+    _s_check ("100", p && strcmp (p, "100") == 0);
+    free (p);
+    p = ft_itoa (-1000);
+    _s_check ("-1000", p && strcmp (p, "-1000") == 0);
+    free (p);
+  }
+
+  /* randomized */
+  for (i = 0; i < _S_RAND_ITERS; i++)
+    {
+      int n = rand () - RAND_MAX / 2;
+      char *p = ft_itoa (n);
+      snprintf (expected, sizeof (expected), "%d", n);
+      snprintf (label, sizeof (label), "random n=%d", n);
+      _s_check (label, p && strcmp (p, expected) == 0);
+      free (p);
+    }
+}
+
+int
+main (void)
+{
+  srand (time (NULL));
+  _s_test_itoa ();
+  _s_print_results ();
+  return (_s_fail != 0);
+}
-- 
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