django 测试 response.context 类型错误：'NoneType' 对象不可下标访问

Question

我想测试这个视图：

def register(request):
    """
    handle user registration
    code variable is for testing purposes
    """
    if request.method== 'GET':
        form = RegisterForm(auto_id=False)
        code = 1
        return render_to_response('register_home.html',locals(),context_instance=RequestContext(request))
    elif request.method == 'POST':
        form = RegisterForm(request.POST)
        if form.is_valid():
            password = form.cleaned_data['password']
            password_confirmation = form.cleaned_data['password_confirmation']
            if password == password_confirmation:
            #if True:
                login = form.cleaned_data['login']
                email = form.cleaned_data['email']
                newsletter = form.cleaned_data['newsletter']
                key = register_user(login,email,password,newsletter)
                if key:             
                    #send email
                    send_mail("Dziękujemy za rejestrację"," Klucz aktywacyjny to " + key,settings.EMAIL_HOST_USER,[email])
                    request.session['email'] = email
                    return redirect(register_success)
                else:
                    code = 4
                    error = "Login /email are taken"
                    return render_to_response('register_home.html',locals(),context_instance=RequestContext(request))
            else:
                code = 3
                error  = "invalid password"
                return render_to_response('register_home.html',locals(),context_instance=RequestContext(request))
        else:
            code = 2
            return render_to_response('register_home.html',locals(),context_instance=RequestContext(request))

这是我测试的一部分：

def test_valid_credentials(self):
        #now try to register valid user
        data = {'login':'test','password':'zaq12wsx','password_confirmation':'zaq12wsx','terms':True,'newsletter':True,'email':'test@test.com'}
        response = self.c.post(reverse('register'),data)
        #our user should be registred
        self.assertEquals(302, response.status_code,'We dont have benn redirected')
        self.assertEqual(len(mail.outbox), 1,'No activation email was sent')
        #clen email box
        mail.outbox = []
        #now try to add anotheer user with the same data
        response = self.c.post(reverse('register'),data)
        #template should be rendered with error message about used login and email
        self.assertEqual(response.context['code'],4)

这是我遇到的错误：

in test_valid_credentials
    self.assertEqual(response.context['code'],4)
TypeError: 'NoneType' object is not subscriptable

我用GET方法试过，效果很好。就是用POST方法不行。我哪里做错了呢？祝好！

Answer 1

我猜测是因为

key = register_user(login,email,password,newsletter)

在重复注册的尝试中会抛出一个异常，所以处理程序没有生成响应。

Answer 2

什么是响应状态？重定向没有上下文。总之，打印出响应内容应该会有帮助。