@Before
  public void setupVMs() {
    locatorA = VM.getVM(0);
    locatorB = VM.getVM(1);
    serverA = VM.getVM(2);
    serverB = VM.getVM(3);
    locatorC = VM.getVM(4);
    serverC = VM.getVM(5);
  }
Test of how PDX works when a single client is connected to multiple
clusters (that are not connected to each other through WAN).
geode-core/src/distributedTest/java/org/apache/geode/pdx/PdxMultiClusterClientServerDUnitTest.java