### Question:
PropertysetItem implements Item, Item.PropertySetChangeNotifier,
        Cloneable { @Override public int hashCode() { return (list == null ? 0 : list.hashCode()) ^ (map == null ? 0 : map.hashCode()) ^ ((propertySetChangeListeners == null || propertySetChangeListeners .isEmpty()) ? 0 : propertySetChangeListeners .hashCode()); }  @Override Property getItemProperty(Object id); @Override Collection<?> getItemPropertyIds(); @Override boolean removeItemProperty(Object id); @Override boolean addItemProperty(Object id, Property property); @Override String toString(); @Override void addPropertySetChangeListener(
            Item.PropertySetChangeListener listener); @Override void removePropertySetChangeListener(
            Item.PropertySetChangeListener listener); Collection<?> getListeners(Class<?> eventType); @Override Object clone(); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void testItemHashCodeEmpty() { PropertysetItem item1 = createPropertySetItem(); PropertysetItem item2 = createPropertySetItem(); Assert.assertEquals(item1.hashCode(), item2.hashCode()); }