@Override
  public void preTearDownCacheTestCase() throws Exception {
    if (cacheTestFixture != this) {
      cacheTestFixture.preTearDownCacheTestCase();
    }
  }
Close the cache in all VMs.
geode-dunit/src/main/java/org/apache/geode/test/dunit/cache/internal/JUnit4CacheTestCase.java