def METHOD_NAME(self):
    output = StringIO()
    self.assertIsNotNone(self.content.thumbnail)
    self.assertTrue(os.path.exists(self.picture.attachment_file.path))
    self.assertTrue(os.path.exists("{path}.120x120_q85_crop.png".format(path=self.picture.attachment_file.path)))
    self.assertEqual(Thumbnail.objects.first().name, "{name}.120x120_q85_crop.png".format(
        name=self.picture.attachment_file.name
    ))
    call_command('remove_thumbnails', stdout=output)
    self.assertTrue(os.path.exists(self.picture.attachment_file.path))
    self.assertFalse(os.path.exists("{name}.120x120_q85_crop.png".format(name=self.picture.attachment_file.path)))
    self.assertEqual(Thumbnail.objects.count(), 0)