Django Image Upload Unit Test

gistfile1.py

from PIL import Image
from rest_framework.test import APIRequestFactory, force_authenticate

class TestPostVetListCreateView:
    factory = APIRequestFactory()

    def test_request_post(self):
        image = Image.new('RGB', (1000, 1000), 'white')
        tmp_file = tempfile.NamedTemporaryFile(suffix='.jpg')
        image.save(tmp_file)
        user = mixer.blend('users.user')
        data = {
            'description': 'BLAh blah',
            'image_1': tmp_file
        }
        tmp_file.seek(0)
        req = self.factory.post('/', data=data)
        force_authenticate(req, user=user)
        resp = views.PostListCreateView.as_view()(req)
        assert resp.status_code == 201, (
            'Should return HTTP 201 CREATED'
        )
        p = models.Post.objects.last()
        image = p.images.first()
        img_s = Image.open(image.standard)
        img_t = Image.open(image.thumbnail)
        assert img_s.size == (612, 612)
        assert img_t.size == (150, 150)