@Override
  public final void preTearDown() throws Exception {
    Invoke.invokeInEveryVM(() -> ConcurrentIndexUpdateWithoutWLDUnitTest.destroyRegions());
    Invoke.invokeInEveryVM(CacheTestCase::closeCache);
  }
Tear down a PartitionedRegionTestCase by cleaning up the existing cache (mainly because we want
to destroy any existing PartitionedRegions)
geode-core/src/distributedTest/java/org/apache/geode/cache/query/internal/index/ConcurrentIndexUpdateWithoutWLDUnitTest.java