如何使用Django的assertJSONEqual来验证返回JsonResponse视图的响应

问题描述

我使用的是Python 3.4和Django 1.7。我有一个视图返回：

  from __future__ import unicode_literals 
 from django.utils导入6 
 
 class AddItemToCollectionTest（TestCase）：
 
 def test_success_when_not_added_before（self）：
 response = self.client.post（'/ add-item-to-收集'）
 self.assertEqual（response.status_code，200）
 
 response_content = response.content 
如果six.PY3：
 response_content = str（response_content，encoding ='utf8'）
 
 self.assertJSONEqual（
 response_content，
 {'status'：'success'} 
）
  

I'm using Python 3.4 and Django 1.7. I have a view returning JsonResponse.

def add_item_to_collection(request):
    #(...)
    return JsonResponse({'status':'success'})

I want to verify if that view returns correct response using unit test:

class AddItemToCollectionTest(TestCase):

    def test_success_when_not_added_before(self):
        response = self.client.post('/add-item-to-collection')
        self.assertEqual(response.status_code, 200)
        self.assertJSONEqual(response.content, {'status': 'success'})

However the assertJSONEqual() line raises an exception:

Error
Traceback (most recent call last):
  File "E:\Projects\collecthub\app\collecthub\collecting\tests.py", line 148, in test_success_when_added_before
    self.assertJSONEqual(response.content, {'status': 'OK'})
  File "E:\Projects\collecthub\venv\lib\site-packages\django\test\testcases.py", line 675, in assertJSONEqual
    data = json.loads(raw)
  File "C:\Python34\Lib\json\__init__.py", line 312, in loads
    s.__class__.__name__))
TypeError: the JSON object must be str, not 'bytes'

What is thet correct way of checking content of response, when response contains JSON? Why i get type error when i try to compare raw value agains a dict in assertJSONEqual() ?

解决方案

It looks like you're working with Python 3 so you'll need to turn response.content into a UTF-8 encoded string before passing it to self.assertJSONEqual:

class AddItemToCollectionTest(TestCase):

    def test_success_when_not_added_before(self):
        response = self.client.post('/add-item-to-collection')
        self.assertEqual(response.status_code, 200)
        self.assertJSONEqual(
            str(response.content, encoding='utf8'),
            {'status': 'success'}
        )

If you want to simultaneously support both Python 2.7 and Python 3, use the six compatibility library that django ships with:

from __future__ import unicode_literals
from django.utils import six

class AddItemToCollectionTest(TestCase):

    def test_success_when_not_added_before(self):
        response = self.client.post('/add-item-to-collection')
        self.assertEqual(response.status_code, 200)

        response_content = response.content
        if six.PY3:
            response_content = str(response_content, encoding='utf8')

        self.assertJSONEqual(
            response_content,
            {'status': 'success'}
        )

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