def test_invalid_template(self):
        data = self.get_valid_data()
        data['content'] = '{% now %}'
        response = self.client.post(self.url, data=data)
        self.assertEqual(response.status_code, 200)
        results = json.loads(response.content.decode('utf-8'))
        self.assertFalse(results['valid'])
        self.assertEqual(results['html'], '')
        self.assertEqual(results['error']['line'], 1)
Re-define this to specify a shell command to filter the combiner's
dataset/ETHPy150Open caktus/django-scribbler/scribbler/tests/test_views.py/PreviewTestCase.test_invalid_template--crossover with--dataset/ETHPy150Open Yelp/mrjob/mrjob/job.py/MRJob.combiner_pre_filter