def test_set_data(self):
data = Data('name')
expected = Item(data=[data])
item = Item()
item.data = [data]
self.assertIsInstance(item.data, Array)
self.assertEqual(item, expected)
def test_set_data_invalid(self):
item = Item()
invalid_obj = object()
with self.assertRaises(TypeError):
item.data = invalid_obj
