python – ‘function’对象没有属性’assert_called_once_with

import unittest.mock as mock

def rm(filename):
    helper(filename,5)

def helper(filename):
    pass

helper = mock.create_autospec(helper)

def test_unix_fs(mocker):
    mocker.patch('module.helper')
    rm('file')
    helper.assert_called_once_with('file',5)

或者更优雅：

import unittest.mock as mock

def rm(filename):
    helper(filename,5)

@mock.create_autospec
def helper(filename):
    pass

def test_unix_fs(mocker):
    mocker.patch('module.helper')
    rm('file')
    helper.assert_called_once_with('file',5)

请注意,断言将失败,因为您只能使用’file’来调用它.所以一个有效的测试将是：

import unittest.mock as mock

def rm(filename):
    helper(filename,5)

@mock.create_autospec
def helper(filename):
    pass

def test_unix_fs(mocker):
    mocker.patch('module.helper')
    rm('file')
    helper.assert_called_once_with('file')

编辑：如果函数在某个模块中定义,您可以在本地将它包装在装饰器中.例如：

import unittest.mock as mock
from some_module import some_function

some_function = mock.create_autospec(some_function)

def test_unix_fs(mocker):
    some_function('file')
    some_function.assert_called_once_with('file')