assertFalse(acl.getAclString().contains("drwho"));
acl.addGroup("tardis");
assertTrue(acl.isAllAllowed());
assertFalse(acl.getAclString().contains("tardis"));
acl.removeUser("drwho");
assertTrue(acl.isAllAllowed());
assertUserAllowed(drwho, acl);
acl.removeGroup("tardis");
assertTrue(acl.isAllAllowed());
assertUserAllowed(drwho2, acl);