fail_unless(set_nibble(0, 0x1, data, sizeof(data)));
fail_unless(set_nibble(1, 0x2, data, sizeof(data)));
fail_unless(set_nibble(2, 0x3, data, sizeof(data)));
fail_unless(set_nibble(0, 0x1, data, sizeof(data)));
fail_unless(set_nibble(1, 0x2, data, sizeof(data)));
fail_unless(set_nibble(2, 0x3, data, sizeof(data)));