If LDAP authentification is set and "Test" button clicked, then in case of a sucess test the message "LDAP login sucessful" is not shown.
If the password is wrong, "Login name or password is incorrect!" is show, but "'LDAP login was not successful" is not shown.

Seems that there should be if instead of elseif in this part of authentication.php:

        elseif (hasRequest('test')) {
                show_messages($login, _('LDAP login successful'), _('LDAP login was not successful'));
        }