Python 烧瓶单元试验——模拟Aerospike DB
我有以下结论:Python 烧瓶单元试验——模拟Aerospike DB,python,unit-testing,flask,aerospike,Python,Unit Testing,Flask,Aerospike,我有以下结论: @developer_blueprint.route("/init_db", methods=["POST"]) def initialize_database(): try: upload_data(current_app) logger.debug("Database entries upload.") return jsonify({"result": "Database entrie
@developer_blueprint.route("/init_db", methods=["POST"])
def initialize_database():
try:
upload_data(current_app)
logger.debug("Database entries upload.")
return jsonify({"result": "Database entries uploaded."}), 201
except Exception as e:
return jsonify({"error": str(e)})
def upload_data(app):
with open("src/core/data/data.json") as data_file:
data = json.load(data_file)
try:
current_app.db.put(("somenamespace", "test", "default"), data, None)
except Exception as e:
raise e
我正试图找出如何对其进行单元测试(我们需要对代码进行覆盖)。
我只是模拟app.db吗?我该怎么做
如果您有任何建议,我们将不胜感激。使用类似的方法模拟用于单元测试的数据库调用,然后在容器或VM中运行Aerospike进行端到端测试,这种情况并不少见 但是,请记住,Aerospike Python客户端库是用C编写的,以获得更好的性能,因此进行部分修补(也称为“猴子修补”)并不容易。例如,如果您尝试简单地修补
aerospeck.Client.put
,您将得到一个TypeError:无法设置内置/扩展类型的属性
一种方法是创建一个模拟客户端对象来替换Aerospike客户端对象或将其子类化。此模拟对象的实现取决于您的代码和测试的案例
以以下示例代码为例,app.db
是Aerospike客户端库的一个实例:
# example.py
import aerospike
import json
class App(object):
db = None
def __init__(self):
config = {'hosts': [('127.0.0.1', 3000)]}
self.db = aerospike.client(config).connect()
def upload_data(app):
with open("data.json") as data_file:
data = json.load(data_file)
try:
app.db.put(("ns1", "test", "default"), data, None)
except Exception as e:
raise e
if __name__ == "__main__":
app = App()
upload_data(app)
在为upload\u data
函数编写单元测试时,假设您想要测试成功案例,该案例被确定为意味着调用了put
方法,并且没有引发异常:
# test.py
from unittest import TestCase, main
from unittest.mock import PropertyMock, patch
from example import App, upload_data
from aerospike import Client, exception
class MockClient(Client):
def __init__(self, *args, **kwargs):
pass
def put(self, *args, **kwargs):
return 0
class ExampleTestCase(TestCase):
def test_upload_data_success(self):
with patch.object(App, 'db', new_callable=PropertyMock) as db_mock:
db_mock.return_value = client = MockClient()
app = App()
with patch.object(client, 'put') as put_mock:
upload_data(app)
put_mock.assert_called()
if __name__ == '__main__':
main()
在test\u upload\u data\u success
方法中,App.db
属性使用MockClient
类而不是aerospeck.Client
类进行修补。MockClient
实例的put
方法也进行了修补,以便可以断言调用upload\u data
后调用了put
方法
为了测试Aerospike客户端引发的异常是否从upload_data
函数重新引发,可以修改MockClient
类以明确引发异常:
# test.py
from unittest import TestCase, main
from unittest.mock import PropertyMock, patch
from example import App, upload_data
from aerospike import Client, exception
class MockClient(Client):
def __init__(self, *args, **kwargs):
self.put_err = None
if 'put_err' in kwargs:
self.put_err = kwargs['put_err']
def put(self, *args, **kwargs):
if self.put_err:
raise self.put_err
else:
return 0
class ExampleTestCase(TestCase):
def test_upload_data_success(self):
with patch.object(App, 'db', new_callable=PropertyMock) as db_mock:
db_mock.return_value = client = MockClient()
app = App()
with patch.object(client, 'put') as put_mock:
upload_data(app)
put_mock.assert_called()
def test_upload_data_error(self):
with patch.object(App, 'db', new_callable=PropertyMock) as db_mock:
db_mock.return_value = MockClient(put_err=exception.AerospikeError)
app = App()
with self.assertRaises(exception.AerospikeError):
upload_data(app)
if __name__ == '__main__':
main()
是的,你会嘲笑db
,回答如何做到这一点是一个广泛的问题,可能不适合这个网站,如果你有一些例子,你试图实现这一点,我们可能能够帮助更多这是一个伟大的答案!唯一的问题——我的团队被指示只使用Pytest而不是unittest,我应该引入unittest只是为了模拟Pytest还是在Pytest中寻找类似的函数。从我看来,这是有限的。pytest应该可以。使用monkeypatch夹具。例如,monkeypatch.setattr(应用程序'db',MockClient())