1 files changed, 105 insertions, 0 deletions
diff --git a/tests/src/test_striteri.c b/tests/src/test_striteri.c
new file mode 100644
index 0000000..0874c02
--- /dev/null
+++ b/tests/src/test_striteri.c
@@ -0,0 +1,105 @@
+#include "libft.h"
+#include "test_utils.h"
+#include <ctype.h>
+
+_S_CRASH_V (ft_striteri_null, ft_striteri (NULL, NULL))
+
+static void
+_s_to_upper (unsigned int i, char *c)
+{
+  (void)i;
+  *c = toupper (*c);
+}
+
+static void
+_s_add_index (unsigned int i, char *c)
+{
+  *c = *c + i;
+}
+
+static void
+_s_test_striteri (void)
+{
+  int i;
+  char label[128];
+
+  _s_section ("ft_striteri");
+
+  /* NULL crashes */
+  _s_check ("NULL crashes", _s_crashes (_s_crash_ft_striteri_null));
+
+  /* basic: to uppercase in place */
+  {
+    char s[] = "hello";
+    ft_striteri (s, _s_to_upper);
+    _s_check ("to_upper", strcmp (s, "HELLO") == 0);
+  }
+
+  /* function receives correct index */
+  {
+    char s[] = "aaaa";
+    ft_striteri (s, _s_add_index);
+    _s_check ("index passed",
+              s[0] == 'a' && s[1] == 'b' && s[2] == 'c' && s[3] == 'd');
+  }
+
+  /* empty string: no crash, no change */
+  {
+    char s[] = "";
+    ft_striteri (s, _s_to_upper);
+    _s_check ("empty", strcmp (s, "") == 0);
+  }
+
+  /* single character */
+  {
+    char s[] = "a";
+    ft_striteri (s, _s_to_upper);
+    _s_check ("single char", strcmp (s, "A") == 0);
+  }
+
+  /* modifies in place (same pointer) */
+  {
+    char s[] = "hello";
+    char *orig = s;
+    ft_striteri (s, _s_to_upper);
+    _s_check ("in place", s == orig);
+  }
+
+  /* randomized: apply to_upper, compare with manual */
+  for (i = 0; i < _S_RAND_ITERS; i++)
+    {
+      int len = rand () % 200 + 1;
+      char *src = malloc (len + 1);
+      char *expected = malloc (len + 1);
+      int j;
+
+      if (!src || !expected)
+        {
+          free (src);
+          free (expected);
+          continue;
+        }
+      for (j = 0; j < len; j++)
+        {
+          src[j] = 'a' + rand () % 26;
+          expected[j] = toupper (src[j]);
+        }
+      src[len] = '\0';
+      expected[len] = '\0';
+
+      ft_striteri (src, _s_to_upper);
+      snprintf (label, sizeof (label), "random len=%d", len);
+      _s_check (label, strcmp (src, expected) == 0);
+      free (src);
+      free (expected);
+    }
+}
+
+int
+main (void)
+{
+  srand (time (NULL));
+  _s_test_striteri ();
+  _s_print_results ();
+  return (_s_fail != 0);
+}