@Test
  public void testSerialGatewaySenderThreadsConnectToSameReceiver() {
    String senderId = "ln";
    String regionName = "region-wan";
    final int remoteLocPort = docker.getExternalPortForService("haproxy", 20334);

    int locPort = createLocator(VM.getVM(0), 1, remoteLocPort);

    VM vm1 = VM.getVM(1);
    createCache(vm1, locPort);

    createGatewaySender(vm1, senderId, 2, false, 5,
        3, GatewaySender.DEFAULT_ORDER_POLICY);

    createPartitionedRegion(vm1, regionName, senderId, 0, 10);

    assertTrue(allDispatchersConnectedToSameReceiver(1));
    assertTrue(allDispatchersConnectedToSameReceiver(2));

  }
The aim of this test is verify that when several gateway receivers in a remote site share the
same port and hostname-for-senders, the pings sent from the gateway senders reach the right
gateway receiver and not just any of the receivers. Failure to do this may result in the
closing of connections by a gateway receiver for not having received the ping in time.
geode-assembly/src/acceptanceTest/java/org/apache/geode/cache/wan/SeveralGatewayReceiversWithSamePortAndHostnameForSendersTest.java