为什么最简单的request_mock示例在pytest中失败? [英] Why does the simplest requests_mock example fail with pytest?
问题描述
我对requests_mock有一个特殊的问题.我想将其与pytest一起使用以测试我的API包装器库.
I have a peculiar problem with requests_mock. I want to use it with pytest to test my API wrapper library.
我已经尝试在requests_mock文档中使用第一个示例，除了我将其放在 test_mock()函数中，并为pytest添加了assert语句以发现它.
I've tried to use the first example in the requests_mock docs, except I put it in a test_mock()-function and added an assert-statement for pytest to discover it.
以下代码失败:
# tests/test_mock.py
import requests
import requests_mock
with requests_mock.Mocker() as m:
def test_mock():
m.get('http://test.com', text='resp')
assert requests.get('http://test.com').text == 'resp'
但是，在ipython中运行以下示例时，它可以按预期运行.这是来自示例:
However, when running the following example in ipython, it works as expected. This is the exact code from the example:
with requests_mock.Mocker() as m:
m.get('http://test.com', text='resp')
print(requests.get('http://test.com').text)
# prints 'resp'
因为我可以通过ipython使requests_mock工作，所以我认为问题出在pytest，但是我可能错了.
Because I can make requests_mock work from ipython, I assume the issue is with pytest, but I might be wrong.
似乎根本没有使用适配器，因此请求将实际的http请求发送到目标url，而不是使用模拟对象.
It seems like the adapter isn't used at all, so that requests sends a real http request to the target url instead of using the mocked object.
我正在使用Python 3.6.3(Anaconda3)，requests_mock 1.3.0和pytest 3.3.0
I'm using Python 3.6.3 (Anaconda3), requests_mock 1.3.0 and pytest 3.3.0
运行失败的代码的输出:
Output from running the code that fails:
C:\dev\mylib>pytest -v
============================= test session starts =============================
platform win32 -- Python 3.6.3, pytest-3.3.0, py-1.5.2, pluggy-0.6.0 -- e:\anaconda3\envs\benv\python.exe
cachedir: .cache
rootdir: C:\dev\mylib, inifile: setup.cfg
collected 1 item
tests/test_mocks.py::test_mock FAILED [100%]
================================== FAILURES ===================================
__________________________________ test_mock __________________________________
def test_mock():
m.get('http://test.com', text='resp')
> assert requests.get('http://test.com').text == 'resp'
E assert '<!DOCTYPE ht...y>\n</html>\n' == 'resp'
E + resp
E - <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
E - <html>
E - <head>
E - <title>Client Validation</title>
E - <script type="text/javascript">
E - function setCookie(c_name, value, expiredays) {...
E
E ...Full output truncated (26 lines hidden), use '-vv' to show
tests\test_mocks.py:9: AssertionError
------------------------------ Captured log call ------------------------------
connectionpool.py 208 DEBUG Starting new HTTP connection (1): test.com
connectionpool.py 396 DEBUG http://test.com:80 "GET / HTTP/1.1" 302 161
connectionpool.py 824 DEBUG Starting new HTTPS connection (1): www.test.com
connectionpool.py 396 DEBUG https://www.test.com:443 "GET / HTTP/1.1" 200 None
========================== 1 failed in 2.05 seconds ===========================
推荐答案
为什么它在IPython中起作用对我来说似乎是一个谜.要解决该问题，只需将函数定义的行与上下文管理器的打开互换即可.
Why it works in IPython seems like a mystery to me. To fix the issue just swap the lines of the function definition with the opening of the context manager.
# tests/test_mock.py
import requests
import requests_mock
def test_mock():
with requests_mock.Mocker() as m:
m.get('http://test.com', text='resp')
assert requests.get('http://test.com').text == 'resp'
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