Python testing framework Pytest - mock use (pytest-mock)

pytest-mock

Installation: pip install pytest-mock

The mock here is basically the same as the mock of unittest, the only difference is that pytest.mock needs to import the detailed path of the mock object.

# weateher_r.py
class Mock_weather():
    def weather(self):
        '''天气接口'''
        pass
    def weather_result(self):
        '''模拟天气接口'''
        result = self.weather()
        if result['result'] == '雪':
            print('下雪了！！！')
        elif result['result'] == '雨':
            print('下雨了！！！')
        elif result['result'] == '晴天':
            print('晴天！！！！')
        else:
            print('返回值错误！')
        return result['status']

First write the weather interface that needs to be simulated and the code for the scene that needs to be simulated, and then follow the use case specifications of pytest to write test cases about mocking.

# test_01.py
import pytest
from test_01.weather_r import Mock_weather
 
 
def test_01(mocker):
    # 实例化
    p = Mock_weather()
    moke_value = {'result': "雪", 'status': '下雪了！'}
    # 通过object的方式进行查找需要mock的对象
    p.weather = mocker.patch.object(Mock_weather, "weather", return_value=moke_value)
    result =p.weather_result()
    assert result=='下雪了！'
     
def test_02(mocker):
    # 实例化
    product = Mock_weather()
    # Mock的返回值
    mock_value = {'result': "雨", 'status': '下雨了！'}
    # 第一个参数必须是模拟mock对象的完整路径
    product.weather = mocker.patch('test_01.weather_r.Mock_weather.weather',return_value=mock_value)
    result = product.weather_result()
    assert result=='下雨了！'
     
if __name__ == '__main__':
    pytest.main(['-vs'])

Through the above code, two methods of mocking in pytest are provided: the first parameter in the first method is to find the class about Mock_weather through object, and then find the following object method name that requires mocking, and the second parameter Represents the value of mock.

The first parameter in the second method is to find the object that needs to be mocked through the complete path, and the second parameter is the value of the mock. Through execution discovery, both methods can be successfully mocked

Finally, I would like to thank everyone who read my article carefully. Looking at the increase in fans and attention, there is always some courtesy. Although it is not a very valuable thing, if you can use it, you can take it directly!

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