def METHOD_NAME(self):
    limit = 1
    results = self.file.query(limit=limit)
    self.assertEqual(len(results[0].keys()), 52)
    results = self.file.query(limit=limit, fields=['entrez_id'])
    self.assertEqual(len(results[0].keys()), 1)
    results = self.file.query(
        limit=limit, exclude_fields=['entrez_id'])
    self.assertEqual(len(results[0].keys()), 51)
    self.assertTrue('entrez_id' not in results[0].keys())