[英]Testing cursor.execute with sql script called using pytest
Function来测试
def get_adgroups_not_taked_share(
campaign_ids: List[str], src_table: str, spend_src_table: str
) -> List[Tuple[str, str]]:
loses_adgroups: List[Tuple[str, str]] = []
with RedshiftCursor() as cursor:
cursor.execute(
"""
SELET some_data from some_table WHERE some_condition
"""
)
for row in cursor.fetchall():
loses_adgroups.append((row[0], str(row[1])))
return loses_adgroups
这个function有测试
import pytest
from my_ap import get_adgroups_not_taked_share
@pytest.fixture
def campaigns_redshift_cursor_mock(mocker):
cursor_mock = mocker.MagicMock()
cursor_mock.fetchall.return_value = [
('hs_video544', '123123123', 100),
('hs_video547', '123123123', 50),
]
rs_cursor_creator = mocker.patch('google_panel.logic.clean_creative.RedshiftCursor')
rs_cursor_creator.return_value.__enter__.return_value = cursor_mock
return rs_cursor_creator
@pytest.mark.django_db
def test_get_adgroups_not_taked_share(
campaigns_redshift_cursor_mock,
):
campaign_ids = ['1111', '2222', '3333']
result = get_adgroups_not_taked_share(campaign_ids, 'test_table', 'spend_src_table')
assert result == [('hs_video544', '123123123'), ('hs_video547', '123123123')]
现在我想添加一个新功能来测试 sql 脚本。 检查是否正在调用正确的 sql 查询。 就像是
def test_get_adgroups_not_taked_share(
campaigns_redshift_cursor_mock,
):
......
query = """SELET some_data from some_table WHERE some_condition"""
campaigns_redshift_cursor_mock.execute.assert_called_with(query)
但是得到了
E AssertionError: Expected call: execute('query')
E Not called
简短的回答是您需要断言: campaigns_redshift_cursor_mock.return_value.__enter__.return_value.execute.assert_called_once_with(query)
。 原因是您使用RedshiftCursor
作为上下文管理器(因此是return_value.__enter__.return_value
部分),然后才调用execute
方法。
一个稍长的答案是我如何得到这个断言。
我编写了这个库,它添加了mg
pytest 夹具。 要使用它,pip 安装它,然后将mg
夹具添加到您的测试并执行它的generate_asserts
方法,如下所示:
@pytest.mark.django_db
def test_get_adgroups_not_taked_share(
campaigns_redshift_cursor_mock,
mg
):
campaign_ids = ['1111', '2222', '3333']
result = get_adgroups_not_taked_share(campaign_ids, 'test_table', 'spend_src_table')
mg.generate_asserts(campaigns_redshift_cursor_mock)
assert result == [('hs_video544', '123123123'), ('hs_video547', '123123123')]
然后像往常一样运行测试,你会得到这个 output 到控制台:
assert 1 == campaigns_redshift_cursor_mock.call_count
campaigns_redshift_cursor_mock.assert_called_once_with()
campaigns_redshift_cursor_mock.return_value.__enter__.assert_called_once_with()
campaigns_redshift_cursor_mock.return_value.__enter__.return_value.execute.assert_called_once_with('\n SELET some_data from some_table WHERE some_condition\n ')
campaigns_redshift_cursor_mock.return_value.__enter__.return_value.fetchall.assert_called_once_with()
campaigns_redshift_cursor_mock.return_value.__exit__.assert_called_once_with(None, None, None)
这些是对模拟的所有调用,您可以过滤与您相关的调用。
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