测试 post 请求时 Django 消息中间件问题

我正在尝试测试一个 UpdateView，它将一条消息添加到重定向的成功页面。看来我的问题来自messages因为 pytest 返回：

django.contrib.messages.api.MessageFailure：如果不安装 django.contrib.messages.middleware.MessageMiddleware，则无法添加消息

我的测试代码是：

def test_authenticated_staff(self, rf):
    langues = LanguageCatalog.objects.create(
        lang_src='wz',
        lang_dest='en',
        percent='4'
    )
    req = rf.get(reverse("dashboard.staff:lang-update", kwargs={'pk': langues.pk}))
    data = {'lang_src': 'it',
            'lang_dest': 'en',
            'percent': '34'}
    req = rf.post(reverse(
        "dashboard.staff:lang-update", kwargs={'pk': langues.pk}), data=data)
    req.user = UserFactory()
    resp = views.LangUpdateView.as_view()(req, pk=langues.pk)

我准确地说MessageMiddleware存在于MIDDLEWARE设置。我用Django==2.0.13.

我找到了解决方案。为了测试此类请求，您需要首先使用会话对其进行注释，然后使用消息对其进行注释。实际上这意味着添加这些行：

from django.contrib.messages.middleware import MessageMiddleware
from django.contrib.sessions.middleware import SessionMiddleware

# in your test method:
"""Annotate a request object with a session"""
middleware = SessionMiddleware()
middleware.process_request(req)
req.session.save()

"""Annotate a request object with a messages"""
middleware = MessageMiddleware()
middleware.process_request(req)
req.session.save()

# and then (in my case)
resp = views.LangUpdateView.as_view()(req, pk=langues.pk)