It just keep "Bummer! Your test didn't pass." While I have no idea what have I missed?

import datetime

from django.core.urlresolvers import reverse
from django.test import TestCase

from .models import Article, Writer

class ArticleListViewTestCase(TestCase):
    '''Tests for the Article list view'''

    def setUp(self):
        self.writer = Writer.objects.create(
            name='Kenneth Love',
            email='kenneth@teamtreehouse.com',
            bio='Your friendly, local Python teacher'
        )
        self.article = Article.objects.create(
          writer=self.writer,
          headline='Article 0',
          content='Something about 0',
          publish_date=datetime.datetime.today()
        )
        for x in range(1, 3):
            Article.objects.create(
                writer=self.writer,
                headline='Article {}'.format(x),
                content='Something about {}'.format(x),
                publish_date=datetime.datetime.today()
            )

    def article_list_response(self):
        resp = self.client.get(reverse('articles:list'))
        assertIn(self.article, resp.context['articles'])

from django.shortcuts import get_object_or_404, render

from .models import Article, Writer


def article_list(request):
    articles = Article.objects.all()
    return render(request, 'articles/article_list.html', {'articles': articles})


def article_detail(request, pk):
    article = get_object_or_404(Article, pk=pk)
    return render(request, 'articles/article_detail.html', {'article': article})


def writer_detail(request, pk):
    writer = get_object_or_404(Writer, pk=pk)
    return render(request, 'articles/writer_detail.html', {'writer': writer})