运行时单元测试 Django Rest Framework 身份验证

Question

我基本上想打开 TokenAuthentication 但仅用于 2 个单元测试。到目前为止，我看到的唯一选择是使用 @override_settings(...) 替换 REST_FRAMEWORK 设置值。

REST_FRAMEWORK_OVERRIDE={
    'PAGINATE_BY': 20,
    'TEST_REQUEST_DEFAULT_FORMAT': 'json',
    'DEFAULT_RENDERER_CLASSES': (
        'rest_framework.renderers.JSONRenderer',
        'rest_framework_csv.renderers.CSVRenderer',
    ),
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.TokenAuthentication',
    ),
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticated',
    ),
}

@override_settings(REST_FRAMEWORK=REST_FRAMEWORK_OVERRIDE)
def test_something(self):

这行不通。我可以在装饰器之前和之后打印设置，并看到值发生了变化，但 django 似乎并不尊重它们。它允许使用测试客户端或 DRF APIClient 对象发送的所有请求无需身份验证即可通过。当我预计 401 未授权时，我收到了 200 条回复。

如果我将同一个字典插入到配置文件夹中的 test_settings.py 文件中，一切都会按预期工作。但是就像我说的，我只想为几个单元测试打开身份验证，而不是全部。我的想法是 Django 在初始化后从不重新访问 DRF 的设置。因此，即使设置值正确，它们也不会被使用。

有没有人遇到过这个问题并找到了解决方案？或解决方法？

Answer 1

以下解决方法对我很有效：

from rest_framework.views import APIView
from rest_framework.permissions import IsAuthenticatedOrReadOnly
from rest_framework.authentication import TokenAuthentication

try:
    from unittest.mock import patch
except ImportError:
    from mock import patch

@patch.object(APIView, 'authentication_classes', new = [TokenAuthentication])
@patch.object(APIView, 'permission_classes', new = [IsAuthenticatedOrReadOnly])
class AuthClientTest(LiveServerTestCase):
    # your tests goes here

Answer 2

只是想我会提到我是如何解决这个问题的。它不漂亮，如果有人有任何清理它的建议，他们非常欢迎！正如我之前提到的，我遇到的问题记录在此处 (https://github.com/tomchristie/django-rest-framework/issues/2466)，但修复方法还不是很清楚。除了重新加载 DRF 视图模块外，我还必须重新加载应用程序视图模块才能使其正常工作。

import os
import json
from django.conf import settings
from django.test.utils import override_settings
from django.utils.six.moves import reload_module

from rest_framework import views as drf_views
from rest_framework.test import force_authenticate, APIRequestFactory, APIClient

from apps.contact import views as cm_views
from django.core.urlresolvers import reverse
from django.test import TestCase
from unittest import mock

REST_FRAMEWORK_OVERRIDE={
'PAGINATE_BY': 20,
'TEST_REQUEST_DEFAULT_FORMAT': 'json',
'DEFAULT_RENDERER_CLASSES': (
    'rest_framework.renderers.JSONRenderer',
    'rest_framework_csv.renderers.CSVRenderer',
),
'DEFAULT_AUTHENTICATION_CLASSES': (
    'rest_framework.authentication.TokenAuthentication',
),
'DEFAULT_PERMISSION_CLASSES': (
    'rest_framework.permissions.IsAuthenticated',
),
}

def test_authenticated(self):
    with override_settings(REST_FRAMEWORK=REST_FRAMEWORK_OVERRIDE):
        # The two lines below will make sure the views have the correct authentication_classes and permission_classes
        reload_module(drf_views)
        reload_module(cm_views)
        from apps.contact.views import AccountView
        UserModelGet = mock.Mock(return_value=self.account)
        factory = APIRequestFactory()
        user = UserModelGet(user='username')
        view = AccountView.as_view()

        # Test non existent account
        path = self.get_account_path("1thiswillneverexist")
        request = factory.get(path)
        force_authenticate(request, user=user)
        response = view(request, account_name=os.path.basename(request.path))
        self.assertEquals(response.status_code, 200, "Wrong status code")
        self.assertEqual(json.loads(str(response.content, encoding='utf-8')), [], "Content not correct for authenticated account request")
    # Reset the views permission_classes and authentication_classes to what they were before this test
    reload_module(cm_views)
    reload_module(drf_views)

Answer 3

哇，真烦人。

这是处理重新加载的通用contextmanager。请注意，您不能直接导入子对象api_settings，因为 DRF 不会在重新加载时更改它，而是将模块级对象重新分配给新实例，因此我们只需在需要时直接从模块中访问它。

from rest_framework import settings as api_conf

@contextmanager
def override_rest_framework_settings(new_settings):
    with override_settings(REST_FRAMEWORK=new_settings):
        # NOTE: `reload_api_settings` is a signal handler, so we have to pass a 
        # couple things in to get it working.
        api_conf.reload_api_settings(setting="REST_FRAMEWORK", value="")
        with mock.patch.multiple(
            "rest_framework.views.APIView",
            authentication_classes=api_conf.api_settings.DEFAULT_AUTHENTICATION_CLASSES,
        ):
            yield
    api_conf.reload_api_settings(setting="REST_FRAMEWORK", value="")

注意：如果您要更改设置的其他方面，您可能还需要修补以下APIView 属性：

renderer_classes = api_settings.DEFAULT_RENDERER_CLASSES
parser_classes = api_settings.DEFAULT_PARSER_CLASSES
authentication_classes = api_settings.DEFAULT_AUTHENTICATION_CLASSES
throttle_classes = api_settings.DEFAULT_THROTTLE_CLASSES
permission_classes = api_settings.DEFAULT_PERMISSION_CLASSES
content_negotiation_class = api_settings.DEFAULT_CONTENT_NEGOTIATION_CLASS
metadata_class = api_settings.DEFAULT_METADATA_CLASS
versioning_class = api_settings.DEFAULT_VERSIONING_CLASS
settings = api_settings