问题描述
我正在尝试为 python 中的一个类编写单元测试.该类在 init 上打开一个 tcp 套接字.我试图对此进行模拟，以便我可以断言使用正确的值调用连接，但显然在单元测试中实际上并没有发生.我已经厌倦了 MagicMock、补丁等，但我还没有找到解决方案.
I am trying to write unit tests for a class in python. The class opens a tcp socket on init. I am trying to mock this out so that I can assert that connecting is called with the correct values but obviously doesn't actually happen in unit tests. I have tired MagicMock, patch, etc but I have not found a solution.
到目前为止，我的班级看起来像这样
My class so far looks like this
import socket
class MyClass(object):
def __init__(self):
self.tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.tcp_socket.connect('0.0.0.0', '6767')
推荐答案
如果只想断言 connect 被正确调用，那么简单的 as
If you just want to assert that connect is called correctly, it's a simple as
import mock
import socket
class MyClass(object):
def __init__(self):
self.tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.tcp_socket.connect('0.0.0.0', '6767')
with mock.patch('socket.socket'):
c = MyClass()
c.tcp_socket.connect.assert_called_with('0.0.0.0', '6767')
如果您必须先导入模块才能访问 MyClass，则需要稍微调整补丁:
If you have to import a module first to access MyClass, you'll need to adjust the patch slightly:
from mymodule import MyClass
import mock
with mock.patch('mymodule.socket.socket'):
c = MyClass()
c.tcp_socket.connect.assert_called_with('0.0.0.0', '6767')
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