def test__consume_from(self):
a = ContextMock(name='A')
b = ContextMock(name='B')
a.__enter__ = Mock(name='A.__enter__')
b.__enter__ = Mock(name='B.__enter__')
with self.c._consume_from(a, b):
pass
a.__enter__.assert_called_with()
b.__enter__.assert_called_with()
