你如何测试一个函数抛出异常？

Question

我有一个函数，想写一个unittest来检查我的代码是否使用模拟库捕获ConnectionError

def get_foo():
    try:
        return requests.get("http://www.bongani.com")
    except requests.exceptions.ConnectionError:
        print("Error")

我有什么：

import unittest
import mock


class MyTestCase(unittest.TestCase):
    @mock.patch('requests.get')
    def test_foo(self, mock_requests_get):
        mock_requests_get.side_effect = requests.exceptions.ConnectionError()
        with self.assertRaises(requests.exceptions.ConnectionError):
            get_foo()

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

我收到此错误：

Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/mock/mock.py", line 1305 , in patched
  return func(*args, **keywargs)
File "<ipython-input-24-15266e4f708a>", , in test_foo
  get_foo()
AssertionError: ConnectionError not raised

我想模拟return requests.get("http://www.bongani.com")行，以便在调用

时引发异常

Answer 1

确保修补正确的路径

yarn why node_modules/*

您不想实例化异常。

yarn why