def test_box_descriptor(self):
b = Box()
self.assertTrue(b.descriptor is None, "Descriptor not initialized to None.")
p = Page()
p.title = 'Testbox 1'
p.data = 'This Page is used as the descriptor for Testbox 1.'
p.save()
b.descriptor = p
b.save()
self.assertTrue(b.descriptor == p, "Descriptor not saved.")
self.assertTrue(p.describes_box == b, "Descriptor does not point back to box.")