Unit testing Django JSON View

I'm trying to write some unit tests for some Django json_view views and I'm having trouble passing the json_string to the view. I posted a related question yesterday about passing a json string to a Django view from the JS, the issue was that in my JS I was just passing the json string where I needed to be passing the string as the attribute of an object, because I was failing to do this the string was being taken as the key for the resulting query dict. I'm having a similar problem again except that this time it is form a Django unit test to the Django View. Here is a simplified version of my code which produces the same result.

class MyTestCase(TestCase):
    def setUp(self):
        self.u = User.objects.create_user('test','test','test')
        self.u.is_active = True
        self.u.save()
        self.client.login(username='test',password='test')

    def test_create_object_from_form(self):
        """Test the creation of the Instance from the form data."""
        import json
        json_string json.dumps({'resource':{'type':'book','author':'John Doe'}})
        print(json_string)
        response = self.client.post(reverse('ajax_view'),
                                    {'form':json_string},'json')
        self.assetNotContains(response,'error')

and the view looks like this

@json_view
def ajax_view(request):
    """Process the incoming form data."""
    if request.method == 'POST':
        print(request.POST)
        form_data = json.loads(request.POST['form'])
        resource_data = form_data['resource']
        form = MyUserForm(resource_data)

        if form.is_valid():
        ...

Here is what the two print statements produce when the test is run. The json_string is

{"resource": {"type": "book", "author": "John Doe"}}

and the query dict looks like

<QueryDict: {u'{\'form\': \'{"resource": {"type": "book", "author": "John Doe"}}\'