@Override
  public final void preTearDown() throws Exception {
    // close client
    vm2.invoke(DestroyEntryPropagationDUnitTest::closeCache);
    vm3.invoke(DestroyEntryPropagationDUnitTest::closeCache);
    // close server
    vm0.invoke(DestroyEntryPropagationDUnitTest::closeCache);
    vm1.invoke(DestroyEntryPropagationDUnitTest::closeCache);
  }
Tests propagation of destroy entry operation across the vms
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/DestroyEntryPropagationDUnitTest.java