def test_flyweight(self):
instance = sdn.Instance()
href1 = HRef.from_parent_and_item(None, instance)
href2 = HRef.from_parent_and_item(None, instance)
self.assertTrue(href1 is href2)
import weakref
w_href1 = weakref.ref(href1)
w_href2 = weakref.ref(href2)
href1 = None
href2 = None
import gc
gc.collect()
self.assertIsNone(w_href1())
self.assertIsNone(w_href2())
instance2 = sdn.Instance()
href1 = HRef.from_sequence([instance, instance2])
href2_parent = HRef(instance, None)
href2 = HRef.from_parent_and_item(href2_parent, instance2)
self.assertTrue(href1 is href2)
def test_hRef_shortcut(self):
item = Instance("myCable")
def2 = Definition("Hello")
item.reference = def2
hr = HRef(item)
self.assertEqual(hr.item.name, item.name, 'Href item shorcut error')
