Django单元测试问题：Client登录功能无法正常工作

最近在编写个人项目的Django单元测试时，我参考了MDN上的服务器端Django测试相关教程，下面是我写的测试代码片段：

from django.core.urlresolvers import reverse
from django.test import Client, TestCase
from django.contrib.auth.models import User
from companies.models import Company

class ContactViewTest(TestCase):
    def setUp(self):
        self.client = Client(HTTP_HOST='localhost:8000')
        company = Company(name='Test')
        company.save()
        user =...

内容的提问来源于stack exchange，提问作者chronox