問題描述

我正在測試一個從另一個非常復雜的類繼承的類，具有數據庫連接方法和一堆依賴項.我想模擬它的基類，以便我可以很好地使用子類中定義的方法，但是在我從模擬類繼承的那一刻，對象本身變成了模擬并丟失了它的所有方法.

I am testing a class that inherits from another one very complex, with DB connection methods and a mess of dependences. I would like to mock its base class so that I can nicely play with the method defined in the subclass, but in the moment I inherit from a mocked class, the object itself turns a mock and loses all its methods.

如何模擬超類?

這種情況或多或少可以概括為:

More or less the situation can be summed up in this:

import mock

ClassMock = mock.MagicMock()

class RealClass(ClassMock):

    def lol(self):
        print 'lol'

real = RealClass()
real.lol()  # Does not print lol, but returns another mock

print real # prints <MagicMock id='...'>

這是一個簡化的案例.實際發生的是 RealClass 擴展了 AnotherClass，但我設法攔截了 AnotherClass 并將其替換為模擬.

This is a simplified case. What is actually happening is that RealClass extends AnotherClass, but I managed to intercept the AnotherClass and replace it with a mock.

推薦答案

這應該適合你.

import mock

ClassMock = mock.MagicMock # <-- Note the removed brackets '()'

class RealClass(ClassMock):

    def lol(self):
        print 'lol'

real = RealClass()
real.lol()  # Does not print lol, but returns another mock

print real # prints <MagicMock id='...'>

您不應該像以前那樣傳遞類的實例.mock.MagicMock 是一個類，所以你直接傳遞它.

You should'nt pass an instance of the class as you did. mock.MagicMock is a class, so you pass it directly.

In [2]: inspect.isclass(mock.MagicMock)
Out[2]: True

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