@Override
  public void disconnectDurableClient(boolean keepAlive) {
    durableClientVM.invoke(() -> CacheServerTestUtil.getPool().endpointsNetDownForDUnitTest());
  }
Class <code>DurableClientCrashDUnitTest</code> tests durable client functionality when clients
are disconnected from servers.

@since GemFire 5.2
geode-cq/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/DurableClientNetDownDUnitTest.java