Question

我正在尝试使用mock.patch模拟几个功能。为了简化可读性，我已经简化了示例。这是我的测试用例的test.py：

from unittest import mock
import pytest
@mock.patch("package1.myfunc")
def test_myfunc(mymock):
    inst1 = MyClass()
    inst1.myfunc()

这是mycode.py中的源代码

import package1
class MyClass:
    def__init__(self):
        pass
    def myfunc(self): #wrapper
        package1.myfunc()

我这样做正确吗？为什么会出现属性错误？我对“ mymock”不做任何其他事情的原因是，我只是希望调用的函数什么也不做。我还需要为其添加返回值吗？

详细的错误消息：

exc_info = (<class 'AttributeError'>, AttributeError("<module 'package1' from '/.../site-packages/package1/__init__.py'> does not have the attribute 'myfunc'"), <traceback object at 0x7f2b86392640>)
patching = <unittest.mock._patch object at 0x7f2b86a479d0>
    @wraps(func)
    def patched(*args, **keywargs):
        extra_args = []
        entered_patchers = []
   
        exc_info = tuple()
        try:
            for patching in patched.patchings:
>               arg = patching.__enter__()
/.../python3.7/lib/python3.7/unittest/mock.py:1247:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/.../python3.7/unittest/mock.py:1319: in __enter__
    original, local = self.get_original()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <unittest.mock._patch object at 0x7f2b86a479d0>
    def get_original(self):
        target = self.getter()
        name = self.attribute
   
        original = DEFAULT
        local = False
   
        try:
[name]             original = target.__dict__
        except (AttributeError, KeyError):
            original = getattr(target, name, DEFAULT)
        else:
            local = True
   
        if name in _builtins and isinstance(target, ModuleType):
            self.create = True
   
        if not self.create and original is DEFAULT:
            raise AttributeError(
>               "%s does not have the attribute %r" % (target, name)
            )
E           AttributeError: <module 'package1' from '....'> does not have the attribute 'myfunc'
/.../python3.7/unittest/mock.py:1293: AttributeError

Answer 1

从python自己的文档可以看到装饰器是这样使用的： @patch('package.module.ClassName.attribute', sentinel.attribute)

来源：https://docs.python.org/3/library/unittest.mock-examples.html

在这种情况下，您似乎缺少 ClassName。你应该使用

@mock.patch("package1.MyClass.myfunc")

使用mock.patch给我AttributeError（“ <模块'package1'>没有属性'myfunc'”？

1 个答案: