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有什么方法可以延迟模拟副作用的评估。

def mockfunc(wheel):
    wheel.rubber = soft

wheel.make = Mock(side_effect=mockfunc(wheel)))

这里的问题是我试图替换“wheel.make”方法，这样当它在测试中被调用时，mockfunc 被调用，并且设置了一个轮子属性而不是运行通常的方法。

事情是-当我设置side_effect时，mockfunc调用立即发生，橡胶属性设置为soft。在调用方法 wheel.make 之前，我不希望这种情况发生。

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1 回答 1

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根据side_effect文档，它应该是可调用的、可迭代的或异常（类或对象）。此外，我猜您想替换's Classmake中的 unboundmethod wheel：要进行此类修补，您应该使用patch或patch.object作为上下文或装饰器，如此处所述。

以下是如何做到这一点的完整示例：

from mock import patch

class Wheel():
    def __init__(self):
        self.rubber = 0

    def make(self):
        self.rubber = 10

soft = 36
def mockfunc(wheel):
    wheel.rubber = soft

wheel = Wheel()
print("unpatched wheel before make rubber = {}".format(wheel.rubber))
wheel.make()
print("unpatched wheel after make rubber = {}".format(wheel.rubber))

with patch.object(Wheel, "make", side_effect=mockfunc, autospec=True):
    print("patched wheel before make rubber = {}".format(wheel.rubber))
    wheel.make()
    print("patched wheel after make rubber = {}".format(wheel.rubber))

输出是

unpatched wheel before make rubber = 0
unpatched wheel after make rubber = 10
patched wheel before make rubber = 10
patched wheel after make rubber = 36
于 2015-01-19T08:48:55.160 回答