如何解决使用Motor AsyncIO和Pytest测试MongoDB功能
因此,我试图编写一些测试来测试使用异步MongoDB连接的功能。为了连接到MongoDB,我将Motor与asyncio一起使用。我需要模拟马达连接的帮助。
我的代码:
commons.py
mongo = None
blacklist.py
import commons
class Blacklist(object):
async def check_if_blacklisted(self,word: str):
blacklisted = False
if await commons.mongo.blacklist.find_one({'word': word}):
blacklisted = True
return blacklisted
main.py
import asyncio
from blacklist import Blacklist
from motor.motor_asyncio import AsyncIOMotorClient
async def run():
commons.mongo = AsyncIOMotorClient("mongodb://localhost",io_loop=asyncio.get_event_loop())
blacklist_checker = Blacklist()
result = await blacklist_checker.check_if_blacklisted(word="should_be_false")
print(result)
# > False
result = await blacklist_checker.check_if_blacklisted(word="should_be_true")
print(result)
# > True
loop = asyncio.get_even_loop()
loop.run_until_complete(run())
loop.close()
我现在想通过模拟马达连接来测试blacklist.py,但似乎无法正常运行测试。这是我尝试过的代码:
test_blacklist.py
import pytest
from blacklist import Blacklist
class TestBlacklist(object):
@pytest.fixture
async def motor(self,event_loop):
# I know I'm not mocking the Motor Connection here,# but just wanted to show you the output using this fixture.
commons.mongo = motor.motor_asyncio.AsyncIOMotorClient(io_loop=event_loop)
yield commons.mongo
commons.mongo.close()
@pytest.mark.asyncio
async def test_check_if_blacklisted(self):
blacklist_checker = Blacklist()
blacklisted = await blacklist_checker.check_if_blacklisted(word="should_be_false")
assert blacklisted == False
# > AttributeError: 'NoneType' object has no attribute 'blacklist'
pytest-mongodb:
import pytest
from unittest.mock import patch
from blacklist import Blacklist
class TestBlacklist(object):
@pytest.mark.asyncio
async def test_check_if_blacklisted(self,mongodb):
with patch("blacklist.commons.mongo") as db:
db = mongodb
blacklist_checker = Blacklist()
blacklisted = await blacklist_checker.check_if_blacklisted(word="should_be_false")
assert blacklisted == False
# > TypeError: object MagicMock can't be used in 'await' expression
我尝试在线搜索,但找不到合适的线程来模拟异步的Motor连接,从而帮助我执行测试。此外,如果您认为我要进行测试的方向不正确,请告诉我,因为我是编写测试的新手,尤其是异步数据库连接。
注意: blacklist.py具有要求MongoDB功能的各种功能,因此,如果在我的test_blacklist.py中我可以一次初始化commons.db,然后所有后续测试都使用它,那就太好了。 / p>
解决方法
您可以使用 pytest-async-mongodb 模拟异步 MongoDB 数据库,但请记住它已过时且存在依赖项错误,因此您必须按以下方式修复依赖项版本:
mongomock==3.12.0
pyyaml==3.13
pytest-asyncio==0.10.0
pytest==3.6.4
使用 pytest-async-mongodb,您可以通过添加一个名为 async_mongodb 的参数来获取测试中的模拟数据库。 我会让你知道代码和结构。
project
-app
__init__.py
blacklist.py
commons.py
-test
-fixtures
blacklist.json
__init__.py
test_blacklist.py
main.py
pytest.ini
main.py
import asyncio
from app.blacklist import Blacklist
from app.commons import get_database,set_client
from motor.motor_asyncio import AsyncIOMotorClient
async def run():
set_client(
AsyncIOMotorClient("mongodb://localhost",io_loop=asyncio.get_event_loop())
)
db = await get_database()
blacklist_checker = Blacklist()
result = await blacklist_checker.check_if_blacklisted(db,word="should_be_false")
print(result)
# > False
result = await blacklist_checker.check_if_blacklisted(db,word="should_be_true")
print(result)
# > True
loop = asyncio.get_event_loop()
loop.run_until_complete(run())
loop.close()
blacklist.py
from motor.motor_asyncio import AsyncIOMotorDatabase
class Blacklist(object):
async def check_if_blacklisted(self,db: AsyncIOMotorDatabase,word: str):
blacklisted = False
if await db.blacklist.find_one({"word": word}):
blacklisted = True
return blacklisted
commons.py
from motor.motor_asyncio import AsyncIOMotorClient,AsyncIOMotorDatabase
class DataBase:
client: AsyncIOMotorClient = None
db = DataBase()
async def get_database() -> AsyncIOMotorDatabase:
return db.client["dbtest"]
def set_client(client):
db.client = client
test_blacklist.py
import pytest
from app import blacklist
@pytest.mark.asyncio
async def test_should_be_false(async_mongodb):
blacklist_checker = blacklist.Blacklist()
blacklisted = await blacklist_checker.check_if_blacklisted(
async_mongodb,word="should_be_false"
)
assert blacklisted == False
@pytest.mark.asyncio
async def test_should_be_true(async_mongodb):
blacklist_checker = blacklist.Blacklist()
blacklisted = await blacklist_checker.check_if_blacklisted(
async_mongodb,word="should_be_true"
)
assert blacklisted == True
pytest.ini
[pytest]
async_mongodb_fixture_dir =
test/fixtures
async_mongodb_fixtures =
blacklist
blacklist.json
[
{
"_id": {"$oid": "60511d158f80a8d34986e2b0"},"word" : "should_be_true"
}
]
夹具也可以是 .yaml 并且可以定义您想要的数量。阅读package documentation了解更多信息。
由于它已经过时,我创建了一个 fork 来更新它并使用新功能对其进行改进。邀请您看一看,如果您愿意,可以使用它。
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