Fix a test dependent on json ordering.

import json

import unittest

from django.contrib.postgres.fields import ArrayField

    def test_dumping(self):

        instance = IntegerArrayModel(field=[1, 2])

        data = serializers.serialize('json', [instance])

        self.assertEqual(data, self.test_data)

        self.assertEqual(json.loads(data), json.loads(self.test_data))

    def test_loading(self):

        instance = list(serializers.deserialize('json', self.test_data))[0].object