def test_eval_with_symbolic_object(self):
some_obj = mock.Mock()
del some_obj._eval
some_obj.some_attr = 'attribute value'
expr = GetAttr(Symbol('some_symbol'), 'some_attr')
self.assertEqual(
expr._eval({'some_symbol': some_obj}),
'attribute value')
def test_eval_with_nonsymbolic_object(self):
some_obj = mock.Mock()
del some_obj._eval
# Ensure constructing the expression does not access `.some_attr`.
del some_obj.some_attr
with self.assertRaises(AttributeError):
some_obj.some_attr
expr = GetAttr(some_obj, 'some_attr')
some_obj.some_attr = 'attribute value'
self.assertEqual(expr._eval({}), 'attribute value')
def test_repr(self):
self.assertEqual(
repr(GetAttr('object', 'attrname')),
"getattr('object', 'attrname')")
