在python中进行单元测试时重写decorator

Question

我正在装饰一个基于django类的视图。不幸的是，decorator发出外部调用来执行状态检查，这超出了单元测试的范围，所以我希望重写decorator，使其在单元测试期间什么也不做。这是我的装修师：

在装饰工.py在

def status_check(func):
    @wraps(func)
    def wrapped(request, *args, **kwargs):

        uri = settings.SERVER_URI
        status_code = None
        bad_status = [404, 500]

        try:
            response = requests.head(uri)
        except requests.ConnectionError as err:
            LOGGER.error('Server is hosed! Oh Noes! Error: %s ' % (err))
            raise Http404
        except Exception as err:
            LOGGER.error('Some crazy stuff is happening. Its Bad. '
                         'Error: %s' % (err))
            raise Http404

        status_code = response.status_code
        if not status_code or status_code in bad_status:
            LOGGER.error('Awww Snap! Server is not happy: %s' % (status_code))
            raise Http404
        return func(request, *args, **kwargs)
    return wrapped

在视图.py在

^{pr2}$

在测试.py在

class RunTest(TestCase):
    def test_post(self):
        post_data = json.dumps({'stuff': 'vodka', 'things': 'tonic'})
        resp = self.client.post(self.foo_uri,
                                post_data,
                                content_type='application/json',
                               )
        self.assertEqual(resp.status_code, 200)

那么，有没有一种方法可以让我覆盖装饰器，或者我可以完全绕过它吗？在这件事上我有点为难。在

编辑 尝试使用krak3n的以下内容模拟请求：

@patch('app.views.method_decorator.status_check', lambda func: func)
@patch('app.views.status_check', lambda func: func)
@patch('app.decorators.status_check', lambda func: func)
@patch('app.views.HandleFoo.post', lambda func: func)

最后一个方法是到目前为止最接近的方法，但它最终抛出了一个stacktrace：

Traceback (most recent call last):
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/mock.py", line 1201, in patched
    return func(*args, **keywargs)
  File "/Users/squiddly/projects/tests/app/tests.py", line 165, in test_post
    content_type='application/json',
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/test/client.py", line 463, in post
    response = super(Client, self).post(path, data=data, content_type=content_type, **extra)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/test/client.py", line 297, in post
    return self.request(**r)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/test/client.py", line 406, in request
    response = self.handler(environ)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/test/client.py", line 111, in __call__
    response = self.get_response(request)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/core/handlers/base.py", line 178, in get_response
    response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/core/handlers/base.py", line 224, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/utils/decorators.py", line 91, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/views/defaults.py", line 41, in server_error
    return http.HttpResponseServerError(template.render(Context({})))
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/base.py", line 140, in render
    return self._render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/test/utils.py", line 65, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/base.py", line 830, in render
    bit = self.render_node(node, context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/debug.py", line 74, in render_node
    return node.render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 124, in render
    return compiled_parent._render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/test/utils.py", line 65, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/base.py", line 830, in render
    bit = self.render_node(node, context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/debug.py", line 74, in render_node
    return node.render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 156, in render
    return self.render_template(self.template, context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 138, in render_template
    output = template.render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/base.py", line 140, in render
    return self._render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/test/utils.py", line 65, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/base.py", line 830, in render
    bit = self.render_node(node, context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/debug.py", line 74, in render_node
    return node.render(context)
  File "/Users/squiddly/envs/testenv/lib/python2.7/site-packages/django/template/base.py", line 1185, in render
    _dict = func(*resolved_args, **resolved_kwargs)
  File "/Users/squiddly/projects/tests/app/templatetags/app_extras.py", line 40, in get_data
    if request.session.has_key('start_time'):
AttributeError: 'str' object has no attribute 'session'

Answer 1

我认为你必须进入黑暗的黑社会，但是一旦你把你的头绕过它（如果你还没有），黑暗的黑社会就会变成一个充满嘲弄的明亮的蓝天。在

您可以使用Mock的patch模块来修补这个修饰符，这样使用它的视图可以变得更易于测试：http://www.voidspace.org.uk/python/mock/patch.html。但我以前不应该亲自去装饰它。。。在

@patch('python.path.to.decorator', new_callable=PropertyMock)
def my_test(self, decorator_mock):
    # your test code

转一转。在

您可以在Mock中阅读patch模块：http://www.voidspace.org.uk/python/mock/patch.html

编辑

new_callable=PropertyMock可能不是修补装饰器的正确方法。在

或许可以试试：

^{2}$

理论上这应该修补decorator，这样它只返回函数，而不是执行wrapped中的所有操作。在