@Override
            public void afterDestroy(EntryEvent event) {
              if (event.getCallbackArgument() != null) {
                lastCallback = event.getCallbackArgument();
              }
            }
Test to make sure slow receiver queuing is working

@since GemFire 4.2.1
geode-core/src/distributedTest/java/org/apache/geode/cache30/SlowRecDUnitTest.java