Test DRF upload file case

I am trying to test file uploading via DRF. I have found this answer, but this still does not work for me. What am I doing wrong?

 from django.core.files.uploadedfile import SimpleUploadedFile

 def test_file_post_view_for_superuser(self):
        client = APIClient()
        this_user = self.superuser
        client.force_authenticate(this_user)

        new_file = SimpleUploadedFile("file.jpeg", b"file_content", content_type='image/jpeg')

        resp = client.post(self.file_list_url,
                           {'folder': self.folder2.pk,
                           'file': new_file.name,
                           'name': 'testf12',
                           'creator': this_user.pk,
                           'upload_date': datetime.datetime.now()}, format='json')

       self.assertEqual(resp.status_code, 201)

I am getting 400 with error:

ErrorDetail(string='The submitted data was not a file. Check the encoding type on the form.', code='invalid')