@Override
  public final void preTearDown() throws Exception {
    vm0.invoke(NewRegionAttributesDUnitTest::closeCache);
    vm1.invoke(NewRegionAttributesDUnitTest::closeCache);
  }
Closes the cache on test VMs

@throws Exception thrown if any problem occurs while closing the cache
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/NewRegionAttributesDUnitTest.java