### Question:
AbstractClusteredQueue implements ClusteredQueue<T> { @Override public final int size() { return queue().size(); }  @Override final void put(final T elt); @Override final int drainTo(final List<T> list); @Override final int size(); @Override final T poll(final long timeout, final TimeUnit unit);  }### Answer:
@Test public void shouldHaveZeroSize() { assertEquals(0, service.size()); }