未绑定方法 f() 必须以 x 实例作为第一个参数调用（取而代之的是 str 实例）

Question

这是我的 class:

class GoogleCloudLayer:

    def deleteMachine(self, machineName):
        return machineName + ' is dead. (stubbed)'

有效：

>>> gc = GoogleCloudLayer()
>>> gc.deleteMachine('test')
test is dead (stubbed)

但我想在测试中使用并且我想在其上定义 assert_called_with 方法:

from mock import MagicMock
#Stubbing with itself just so it will have the `assert_called_with` method defined on it
GoogleCloudLayer.deleteMachine = MagicMock(side_effect = GoogleCloudLayer.deleteMachine)

但后来我得到

>>> gc = GoogleCloudLayer()
>>> gc.deleteMachine('test')
unbound method deleteMachine() must be called with GoogleCloudLayer instance as first argument (got str instance instead)

如果我将生产代码更改为 gc.deleteMachine(gc, 'test')，它就可以工作。但我们不希望这样，对吗？

Answer 1

lambda 在这种情况下很有用，试试：

GoogleCloudLayer.createMachine = MagicMock(side_effect = lambda *args, **kwargs: GoogleCloudLayer.createMachine)

未绑定方法 f() 必须以 x 实例作为第一个参数调用（取而代之的是 str 实例）

unbound method f() must be called with x instance as first argument (got str instance instead)

python

magicmock