@Before
  public void setup() {
    vm0 = VM.getVM(0);
    vm1 = VM.getVM(1);
    vm2 = VM.getVM(2);
    vm3 = VM.getVM(3);
  }
Abstract superclass of {@link Region} tests that involve more than one VM.
geode-dunit/src/main/java/org/apache/geode/cache30/MultiVMRegionTestCase.java