@Test
public void testFlipMemberVotingStatesWithVotingMembersDown() throws Exception {

    String name = "testFlipMemberVotingStatesWithVotingMembersDown";
    // Members 4, 5, and 6 are initially non-voting and simulated as down by not starting them up.
    ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
            new ServerInfo("member-1", true), new ServerInfo("member-2", true),
            new ServerInfo("member-3", true), new ServerInfo("member-4", false),
            new ServerInfo("member-5", false), new ServerInfo("member-6", false)));
    setupPersistedServerConfigPayload(persistedServerConfig, "member-1", name, "cars", "people");
    setupPersistedServerConfigPayload(persistedServerConfig, "member-2", name, "cars", "people");
    setupPersistedServerConfigPayload(persistedServerConfig, "member-3", name, "cars", "people");
    String moduleShardsConfig = "module-shards-member1-and-2-and-3.conf";
    final MemberNode leaderNode1 = MemberNode.builder(memberNodes).akkaConfig("Member1").testName(name)
            .moduleShardsConfig(moduleShardsConfig).datastoreContextBuilder(
                    DatastoreContext.newBuilder().shardHeartbeatIntervalInMillis(300).shardElectionTimeoutFactor(1))
            .build();
    final MemberNode replicaNode2 = MemberNode.builder(memberNodes).akkaConfig("Member2").testName(name)
            .moduleShardsConfig(moduleShardsConfig).build();
    final MemberNode replicaNode3 = MemberNode.builder(memberNodes).akkaConfig("Member3").testName(name)
            .moduleShardsConfig(moduleShardsConfig).build();
    leaderNode1.configDataStore().waitTillReady();
    leaderNode1.operDataStore().waitTillReady();
    verifyVotingStates(leaderNode1.configDataStore(), "cars", new SimpleEntry<>("member-1", TRUE),
            new SimpleEntry<>("member-2", TRUE), new SimpleEntry<>("member-3", TRUE),
            new SimpleEntry<>("member-4", FALSE), new SimpleEntry<>("member-5", FALSE),
            new SimpleEntry<>("member-6", FALSE));
    ClusterAdminRpcService service1 = new ClusterAdminRpcService(leaderNode1.configDataStore(),
            leaderNode1.operDataStore(), null);
    RpcResult<FlipMemberVotingStatesForAllShardsOutput> rpcResult = service1.flipMemberVotingStatesForAllShards(
        new FlipMemberVotingStatesForAllShardsInputBuilder().build()).get(10, TimeUnit.SECONDS);
    FlipMemberVotingStatesForAllShardsOutput result = verifySuccessfulRpcResult(rpcResult);
    verifyShardResults(result.getShardResult(), successShardResult("cars", DataStoreType.Config),
            successShardResult("people", DataStoreType.Config),
            successShardResult("cars", DataStoreType.Operational),
            successShardResult("people", DataStoreType.Operational));
    // Members 2 and 3 are now non-voting but should get replicated with the new new server config.
    verifyVotingStates(new AbstractDataStore[]{leaderNode1.configDataStore(), leaderNode1.operDataStore(),
            replicaNode2.configDataStore(), replicaNode2.operDataStore(),
            replicaNode3.configDataStore(), replicaNode3.operDataStore()},
            new String[]{"cars", "people"},
            new SimpleEntry<>("member-1", FALSE), new SimpleEntry<>("member-2", FALSE),
            new SimpleEntry<>("member-3", FALSE), new SimpleEntry<>("member-4", TRUE),
            new SimpleEntry<>("member-5", TRUE), new SimpleEntry<>("member-6", TRUE));
    // The leader (member 1) was changed to non-voting but it shouldn't be able to step down as leader yet
    // b/c it can't get a majority consensus with all voting members down. So verify it remains the leader.
    verifyRaftState(leaderNode1.configDataStore(), "cars", raftState -> {
        assertNotNull("Expected non-null leader Id", raftState.getLeader());
        assertTrue("Expected leader member-1", raftState.getLeader().contains("member-1"));
    });
}