def test_owner(self):
expr2 = Expression('test', 'fish', op=OP_SUB)
expr1 = Expression(1, 2, expr2, op=OP_ADD)
mock_owner = MockOwner()
expr1.owner = mock_owner
self.assertEqual(id(expr1._owner_ref()), id(expr2._owner_ref()))
def test_copy(self):
expr = Expression(1, 2, 3, Expression(1, 3, 4), op=OP_SUB)
mock_owner = MockOwner()
expr.owner = mock_owner
expr_copy = copy.copy(expr)
self.assertNotEqual(id(expr), id(expr_copy))
self.assertNotEqual(id(expr._tokens), id(expr_copy._tokens))
self.assertEqual(
[id(t) for t in expr._tokens],
[id(t) for t in expr_copy._tokens])
self.assertEqual(expr.alias, expr_copy.alias)
self.assertEqual(id(expr._owner_ref()), id(expr_copy._owner_ref()))
