pytest mock 单测

demo.py:

def get_sum(x, y):
    pass

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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)

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test_fun() # -> 此时返回值为20