Function is_invalid

Tests/CMakeLib/testUTF8.cxx:145–156

}

static bool is_invalid(test_utf8_char s)
{
  bool valid = cm_utf8_is_valid(s.data()) != 0;
  if (valid) {
    report_invalid(false, s);
    printf("expected invalid, reported as valid\n");
    return false;
  }
  report_invalid(true, s);
  printf("invalid as expected\n");
  return true;
}

int testUTF8(int /*unused*/, char* /*unused*/[])
{