Python:How to 实现多个动态mock.patch函数？

Question

我试图在python中动态模拟/修补一个类的多个@property方法

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，我得到以下错误：

      with mocks:

E AttributeError: enter

显然，这不是根据如上所示的配置模拟多个属性的合适方法？有人能告诉我如何最好地实现这一点，谢谢

Answer 1

除了亚历克斯的回答外，以下问题解决了：

if "mock" in case:
        for m,v in case["mock"].items():
            def get_value(self):return v
            monkeypatch.setattr(State, m, property(get_value))

Answer 2

最简单的方法是使用contextlib.ExitStack：https://docs.python.org/3/library/contextlib.html#supporting-a-variable-number-of-context-managers

另一种选择是使用pytest的monkeypatchfixture:https://docs.pytest.org/en/latest/monkeypatch.html