pytest-模拟assert_called_with类函数失败
pytest-模拟assert_called_with类函数失败
提问于 2018-05-04 00:24:37
我计划使用pytest和pytest- code来验证Python代码。作为一个新手，编写了一个示例代码来验证类上的模拟并看到失败。我想知道哪里出了问题。
src/main.py
class Main(object):
def __init__(self, my_var=None):
self.var = my_var
def internal_func(self, var=10):
my_var = var + 20
return my_var
def test_func(self):
val = self.internal_func(20)
return val + 40测试/test_main.py
import pytest
from pytest_mock import mocker
from src.main import Main
def new_func(cls, *args, **kwargs):
return 2
def test_main_mock(mocker):
mocker.patch.object(Main, 'internal_func')
val = Main().test_func()
assert Main.internal_func.assert_called_with(20)如果出现以下错误，它将失败
======================================================================================== FAILURES ========================================================================================
_____________________________________________________________________________________ test_main_mock _____________________________________________________________________________________
mocker = <pytest_mock.MockFixture object at 0x7f34f490d8d0>
def test_main_mock(mocker):
mocker.patch.object(Main, 'internal_func')
main = Main()
val = main.test_func()
# assert val == 80
> assert Main.internal_func.assert_called_with(20)
E AssertionError: assert None
E + where None = <bound method MagicMock.wrap_assert_called_with of <MagicMock name='internal_func' id='139865418160784'>>(20)
E + where <bound method MagicMock.wrap_assert_called_with of <MagicMock name='internal_func' id='139865418160784'>> = <MagicMock name='internal_func' id='139865418160784'>.assert_called_with
E + where <MagicMock name='internal_func' id='139865418160784'> = Main.internal_func
tests/test_main.py:13: AssertionError回答 1
Stack Overflow用户
回答已采纳
发布于 2018-05-04 03:25:02
必须在修补的功能生效之前设置return_value或side_effect。
def test_main_mock(mocker):
# mock internal_func of class Main
mocked_internal_func = mocker.patch.object(Main, 'internal_func')
# assign return_value or side_effect
mocked_internal_func.return_value = -10
# class instance
ma = Main()
val = ma.test_func()
assert ma.internal_func.assert_called_with(20)纠正错误时，断言不应与
assert_called_with一起使用，它们是独立的断言。
assert val == 30
mocked_internal_func.assert_called
ma.internal_func.assert_called_with(20)
mocked_internal_func.assert_called_with(20)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50165477
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