_where_clause_generation(self):         """         Tests the where clause creation         """         query0 = self.table.objects(test_id=0)         self.assertEqual(len(query0._where), 0)         where = query0._where[0]         self.assertEqual(where.field, 'test_id')         self.assertEqual(where.value, 0)          query0 = query0.filter(expected_result__gte=0)         self.assertEqual(len(query0._where), 0)          where = query0._where[0]         self.assertEqual(where.field, 'test_id')         self.assertIsInstance(where.operator, EqualsOperator)         self.assertEqual(where.value, 0)          where = query0._where[0]         self.assertEqual(where.field, 'expected_result')         self.assertIsInstance(where.operator, GreaterThanOrEqualOperator)         self.assertEqual(where.value, 0)      