pytest mock 单测

mock一般与patch联用

demo.py:

def get_sum(x, y):
    pass

--------------------------------------------------------------------

import demo
from unittest import mock

def test_fun():
    mock_get_sum = mock.patch('demo.get_sum', return_value=20)

    mock_get_sum.start()
    result = demo.get_sum()
    mock_get_sum.stop()
    
    print(result)

--------------------------------------------------------------------

test_fun() # -> 此时返回值为20

可能会遇到报错  mock.patch AttributeError: 'function' object has no attribute

此时看一下闭包问题，包括 patch后的 函数路径，有没有用单引号引起来