问题描述
我们一直在使用 Mock for python.
We have been using Mock for python for a while.
现在,我们要模拟一个函数
Now, we have a situation in which we want to mock a function
def foo(self, my_param): #do something here, assign something to my_result return my_result
通常,模拟它的方法是(假设 foo 是对象的一部分)
Normally, the way to mock this would be (assuming foo being part of an object)
self.foo = MagicMock(return_value="mocked!")
即使我调用 foo() 几次我也可以使用
Even, if i call foo() a couple of times i can use
self.foo = MagicMock(side_effect=["mocked once", "mocked twice!"])
现在,我面临一种情况,当输入参数具有特定值时,我想返回一个固定值.因此,如果假设my_param"等于something",那么我想返回my_cool_mock"
Now, I am facing a situation in which I want to return a fixed value when the input parameter has a particular value. So if let's say "my_param" is equal to "something" then I want to return "my_cool_mock"
这似乎在 mockito for python
when(dummy).foo("something").thenReturn("my_cool_mock")
我一直在寻找如何通过 Mock 实现同样的目标,但没有成功?
I have been searching on how to achieve the same with Mock with no success?
有什么想法吗?
推荐答案
如果 side_effect_func 是一个函数,那么该函数返回的是什么叫模拟返回.side_effect_func 函数被调用与模拟相同的论点.这允许您改变回报根据输入动态调用的值:
If side_effect_func is a function then whatever that function returns is what calls to the mock return. The side_effect_func function is called with the same arguments as the mock. This allows you to vary the return value of the call dynamically, based on the input:
>>> def side_effect_func(value): ... return value + 1 ... >>> m = MagicMock(side_effect=side_effect_func) >>> m(1) 2 >>> m(2) 3 >>> m.mock_calls [call(1), call(2)]
http://www.voidspace.org.uk/python/模拟/mock.html#calling