Test -Error :AssertionError: 404 != 200

Dear all

I can't do the test -error is 

self.assertEqual(response.status_code, 200)

AssertionError: 404 != 200

My code is

views.py 

class DetailPageView(DetailView):
    model = Series
    template_name='/var/www/project/tapelss/movies/archive/templates/archive/detail.html'

urls.py

app_name = 'archive'
urlpatterns =[
    path('',views.indexing, name ='indexing'),
    path('post/<int:pk>/', DetailPageView.as_view(), name='post_detail'),
    path('post',HomePageView.as_view(), name ='home'),
    path('page',views.page, name= 'page'),

tests.py
def test_post_detail_view(self):
    response = self.client.get('/post/264/')
    no_response = self.client.get('/post/1000000/')
    self.assertEqual(response.status_code, 200)
    self.assertEqual(no_response.status_code, 404)
    self.assertContains(response,'Nice body content')
    self.assertTemplateUsed(response, 'detail.html')

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