assertEquals(iter.next(), "tardis");
assertEquals(iter.next(), "users");
assertEquals("drwho,joe tardis,users", acl.getAclString());
acl.removeUser("joe");
acl.removeGroup("users");
users = acl.getUsers();
assertEquals(users.size(), 1);
assertFalse(users.contains("joe"));
groups = acl.getGroups();
assertEquals(groups.size(), 1);