Python:如何实现多个动态mock.patch函数？

Question

我正在尝试动态模拟/修补 python 中类的多个 @property 方法，即

class Dog():
     ...

     @property
     def size(self):
        .....

     @property
     def breed(self):
        .....


cases = [{"size":9, "breed":"doberman"}, {"size":2, "breed":"pug"}]

@pytest.mark.parametrize("case", list(cases.values()), ids=list(cases.keys()))
def test_properties(case):

    dog = Dog()
    mocks = ()

    for m, v in case.items():
       mocks += (mock.patch.object(dog, m, return_value=v),)

    with mocks:
        ...

但是，我收到以下错误:

      with mocks:

E AttributeError: enter

显然这不是根据上面所示的配置模拟多个属性的适当方法？有人可以建议我如何最好地实现这一目标，谢谢!

Answer 1

对您来说最简单的选择是使用contextlib.ExitStack:https://docs.python.org/3/library/contextlib.html#supporting-a-variable-number-of-context-managers

另一个选择是使用 pytest 的 monkeypatch 固定装置:https://docs.pytest.org/en/latest/monkeypatch.html