The code was not correct or very clear, and the tests were not testing what they intended to. I expanded the tests and I could add even more tests, but I was trying to stick to fixing the main problem.
Two of the new tests are to-do because Wine does not translate LDAP_OPT_ON to WLDAP32_OPT_ON in ldap_get_optionW. I haven't fixed that because to fix it properly, we would have to save the specific value that was passed to Wine's ldap_set_optionW and return that value from ldap_get_optionW instead of what was passed to OpenLDAP's ldap_set_option.