How can I test an overridden GET method in Django CBV?

I have a django DetailView that I've overridden to allow the user to unsubscribe from emails using a query string in the get method:

  class MemberProfileView(DetailView):                                                  
      template_name = "profile.html"                                                    
      model = Member                                                                    

      def get(self, request, *args, **kwargs):                                          
          if request.GET.get('unsubscribe') is True:                                    
              request.user.email_me = False                                             
              request.user.save()                                                       
          elif request.GET.get('unsubscribe') is False:                                 
              request.user.email_me = True                                              
              request.user.save()                                                       
          self.object = self.get_object()                                               
          context = self.get_context_data(object=self.get_object)                       
          return self.render_to_response(context) 

This works fine when I use the link from an email. However, when I try to test this code, the test client doesn't follow the overridden get method in the DetailView; it goes through a get method specific to the test client/suite. How do I test this overridden get method? Here is my test code:

def test_unsubscribe_link(self):                                                
    url = reverse('profile_page', args=[self.member.pk])                        
    self.assertTrue(self.member.email_me)                                       
    response = self.client.get(url, {'unsubscribe': True})                      
    self.assertFalse(self.member.email_me)                                      
    self.assertEqual(response.status_code, 200)                                 
    self.assertContains(response.content, "Email me reminder notifications: No")