如何让 httpretty 在测试期间停止打印异常？

Question

我有一个模拟来自不存在的远程服务器的请求的测试：

    @httpretty.activate
    def test_no_such_host(self):

        def no_such_host(request, uri, headers):
            raise requests.ConnectionError()

        httpretty.register_uri(
                'GET',
                EXAMPLE_WEBFINGER_URL,
                status=200,
                headers = {
                    'Content-Type': 'application/jrd+json',
                    },
                body = no_such_host,
                )

        webfinger = get_webfinger(
                EXAMPLE_USERNAME,
                EXAMPLE_HOSTNAME,
                )

        self.assertEqual(
                webfinger.url,
                None,
                )

get_webfinger 实际上赶上了 ConnectionError。当它运行s 时，测试通过——但它也报告来自 httpretty 线程的 ConnectionError 异常：

Creating test database for alias 'default'...
System check identified no issues (0 silenced).
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/home/marnanel/alpha/lib/python3.6/site-packages/httpretty/core.py", line 781, in fill_filekind
    status, headers, self.body = self.callable_body(self.request, self.info.full_url(), headers)
  File "/home/marnanel/proj/kepi/kepi/sombrero_sendpub/tests/test_webfinger.py", line 183, in no_such_host
    raise requests.ConnectionError()
requests.exceptions.ConnectionError

.
----------------------------------------------------------------------
Ran 1 test in 0.117s

OK
Destroying test database for alias 'default'...

单元测试或正在测试的代码中没有线程。这是许多类似的测试之一。那些不涉及异常的都是运行完美。

如何让它停止打印异常？

Answer 1

HTTPPretty 使用线程 simulate socket timeouts but are not handling exceptions correctly, see issue #334。后者提出了一种处理异常的方法，但尚未被维护者采纳（尚未）。

但是，您看到的消息是默认打印的 threading.excepthook() implementation。你可以设置自己的钩子；空操作 lambda 会使错误消失：

threading.excepthook = lambda a: None

您可以使用上下文管理器暂时禁用挂钩：

import threading
from contextlib import contextmanager

@contextmanager
def suppress_thread_exceptions():
    orig = threading.excepthook
    threading.excepthook = lambda a: None
    try:
        yield
    finally:
        threading.excepthook = orig

然后在你的测试中使用上面的：

with suppress_thread_exceptions():
    # use HTTPretty

如何让 httpretty 在测试期间停止打印异常？

How can I get httpretty to stop printing exceptions during testing?

python

multithreading

unit-testing

httpretty