public boolean waitForDestroyed(final K key) {
    GeodeAwaitility.await("Waiting for key destroy: " + key)
        .until(() -> destroys.contains(key));
    return true;
  }
Clears the state of the listener, for consistent behavior this should only be called when there
is no activity on the Region
geode-dunit/src/main/java/org/apache/geode/cache30/CertifiableTestCacheListener.java