def test_category(self):
"""Adding parents and childs.
"""
root_category = Category(
name='root', slug='root')
root_category.save()
child_category = Category(
name='child',
slug='child',
parent=root_category)
child_category.save()
children = root_category.get_children()
self.assertEquals(len(children), 1)
self.assertEquals(str(children[0]), str(child_category))
