@Override
      public boolean wasInvoked() {
        boolean value = closed && destroyed;
        super.wasInvoked();
        return value;
      }
Tests that the <code>CacheWriter</code> is called before a region is destroyed.

@see CacheWriter#beforeRegionDestroy
@see CacheWriter#close
geode-core/src/distributedTest/java/org/apache/geode/cache30/CacheWriterTestCase.java