assertSame(node1, new PreferredSingletonElectionPolicy(policy, preference1, preference2).elect(Arrays.asList(node4, node3, node2, node1)));
assertSame(node2, new PreferredSingletonElectionPolicy(policy, preference1, preference2).elect(Arrays.asList(node2, node3, node4)));
assertSame(node2, new PreferredSingletonElectionPolicy(policy, preference1, preference2).elect(Arrays.asList(node4, node3, node2)));
List<Node> nodes = Arrays.asList(node3, node4);
when(policy.elect(nodes)).thenReturn(node3);
assertSame(node3, new PreferredSingletonElectionPolicy(policy, preference1, preference2).elect(nodes));
when(policy.elect(nodes)).thenReturn(node4);