cython - pytest.raises(AssertionError) 使用 cython 模块失败

Question

将文件 python_assert.py 和 cython_assert.pyx 定义为相同的，每个文件都包含一个引发 AssertionError 的简单函数:

def raise_assertionerror():
    assert False

我希望以下两个测试都能在 pytest 下成功:

import pytest

import pyximport
pyximport.install()

from python_assert import raise_assertionerror as python_assert
from cython_assert import raise_assertionerror as cython_assert

def test_assertion():
    with pytest.raises(AssertionError):
        python_assert()

def test_cython_assertion():
    with pytest.raises(AssertionError):
        cython_assert()

但是，cython 测试失败:

===================================== FAILURES ======================================
_______________________________ test_cython_assertion _______________________________

    def test_cython_assertion():
        with pytest.raises(AssertionError):
>           cython_assert()

test_pytest_assertion.py:15: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   assert False
E   AssertionError

cython_assert.pyx:2: AssertionError
======================== 1 failed, 1 passed in 0.61 seconds =========================

这似乎是 pytest 的问题，因为等效的 unittest 成功:

import unittest

import pyximport
pyximport.install()

from python_assert import raise_assertionerror as python_assert
from cython_assert import raise_assertionerror as cython_assert

class MyTestCase(unittest.TestCase):
    def test_cython(self):
        self.assertRaises(AssertionError, cython_assert)

    def test_python(self):
        self.assertRaises(AssertionError, python_assert)

if __name__ == "__main__":
    unittest.main()

此外，如果我们调用 pytest.raises(Exception)，则 pytest 测试成功。而不是 pytest.raises(AssertionError) .

知道有什么问题吗？

Answer 1

这是recognized as a bug in pytest并解决。