--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/utf8proc/test/case.c	Thu Jun 20 05:56:06 2024 -0400
@@ -0,0 +1,76 @@
+#include "tests.h"
+#include <wctype.h>
+
+int main(int argc, char **argv)
+{
+     int error = 0, better = 0;
+     utf8proc_int32_t c;
+
+     (void) argc; /* unused */
+     (void) argv; /* unused */
+
+     /* some simple sanity tests of the character widths */
+     for (c = 0; c <= 0x110000; ++c) {
+          utf8proc_int32_t l = utf8proc_tolower(c);
+          utf8proc_int32_t u = utf8proc_toupper(c);
+          utf8proc_int32_t t = utf8proc_totitle(c);
+
+          check(l == c || utf8proc_codepoint_valid(l), "invalid tolower");
+          check(u == c || utf8proc_codepoint_valid(u), "invalid toupper");
+          check(t == c || utf8proc_codepoint_valid(t), "invalid totitle");
+
+          if (utf8proc_codepoint_valid(c) && (l == u) != (l == t) &&
+              /* Unicode 11: Georgian Mkhedruli chars have uppercase but no titlecase. */
+              !(((c >= 0x10d0 && c <= 0x10fa) || c >= (0x10fd && c <= 0x10ff)) && l != u)) {
+               fprintf(stderr, "unexpected titlecase %x for lowercase %x / uppercase %x\n", t, l, c);
+               ++error;
+          }
+
+          if (sizeof(wint_t) > 2 || (c < (1<<16) && u < (1<<16) && l < (1<<16))) {
+               wint_t l0 = towlower((wint_t)c), u0 = towupper((wint_t)c);
+
+               /* OS unicode tables may be out of date.  But if they
+                  do have a lower/uppercase mapping, hopefully it
+                  is correct? */
+               if (l0 != (wint_t)c && l0 != (wint_t)l) {
+                    fprintf(stderr, "MISMATCH %x != towlower(%x) == %x\n",
+                            l, c, l0);
+                    ++error;
+               }
+               else if (l0 != (wint_t)l) { /* often true for out-of-date OS unicode */
+                    ++better;
+                    /* printf("%x != towlower(%x) == %x\n", l, c, l0); */
+               }
+               if (u0 != (wint_t)c && u0 != (wint_t)u) {
+                    fprintf(stderr, "MISMATCH %x != towupper(%x) == %x\n",
+                            u, c, u0);
+                    ++error;
+               }
+               else if (u0 != (wint_t)u) { /* often true for out-of-date OS unicode */
+                    ++better;
+                    /* printf("%x != towupper(%x) == %x\n", u, c, u0); */
+               }
+          }
+     }
+     check(!error, "utf8proc case conversion FAILED %d tests.", error);
+
+     /* issue #130 */
+     check(utf8proc_toupper(0x00df) == 0x1e9e &&
+           utf8proc_totitle(0x00df) == 0x1e9e &&
+           utf8proc_tolower(0x00df) == 0x00df &&
+           utf8proc_tolower(0x1e9e) == 0x00df &&
+           utf8proc_toupper(0x1e9e) == 0x1e9e,
+           "incorrect 0x00df/0x1e9e case conversions");
+     utf8proc_uint8_t str_00df[] = {0xc3, 0x9f, 0x00};
+     utf8proc_uint8_t str_1e9e[] = {0xe1, 0xba, 0x9e, 0x00};
+     utf8proc_uint8_t *s1 = utf8proc_NFKC_Casefold(str_00df);
+     utf8proc_uint8_t *s2 = utf8proc_NFKC_Casefold(str_1e9e);
+     check(!strcmp((char*)s1, "ss") &&
+           !strcmp((char*)s2, "ss"),
+           "incorrect 0x00df/0x1e9e casefold normalization");
+     free(s1);
+     free(s2);
+     printf("More up-to-date than OS unicode tables for %d tests.\n", better);
+     printf("utf8proc case conversion tests SUCCEEDED.\n");
+     return 0;
+}