self = 
project_id = 'precise-truck-742'
def test_query_with_parameters(self, project_id):
    sql_statement = "SELECT @param1 + @param2 AS valid_result"
    config = {
        "query": {
            "useLegacySql": False,
            "parameterMode": "named",
            "queryParameters": [
                {
                    "name": "param1",
                    "parameterType": {"type": "INTEGER"},
                    "parameterValue": {"value": 1},
                },
                {
                    "name": "param2",
                    "parameterType": {"type": "INTEGER"},
                    "parameterValue": {"value": 2},
                },
            ],
        }
    }
    # Test that a query that relies on parameters fails
    # when parameters are not supplied via configuration
    with pytest.raises(ValueError):
        gbq.read_gbq(
            sql_statement,
            project_id=project_id,
            credentials=self.credentials,
            dialect="legacy",
        )

    # Test that the query is successful because we have supplied
    # the correct query parameters via the 'config' option
    df = gbq.read_gbq(
        sql_statement,
        project_id=project_id,
        credentials=self.credentials,
        configuration=config,
        dialect="legacy",
    )


  tm.assert_frame_equal(df, DataFrame({"valid_result": [3]}))


E       AssertionError: Attributes of DataFrame.iloc[:, 0] (column name="valid_result") are different

E

E       Attribute "dtype" are different

E       [left]:  Int64

E       [right]: int64
tests/system/test_gbq.py:722: AssertionError