Python 单元测试烧瓶应用程序-在应用程序中模拟全局变量
我有一个Flask应用程序模块(Python 单元测试烧瓶应用程序-在应用程序中模拟全局变量,python,flask,python-unittest,Python,Flask,Python Unittest,我有一个Flask应用程序模块(app.py),看起来像这样 # imports ... from flask import Flask, request, Response ... # module-level vars, including `logger` and `APP` ... logger = None APP = None ... def init(): """ Initialisation of app resources, including `logge
app.py
),看起来像这样
# imports
...
from flask import Flask, request, Response
...
# module-level vars, including `logger` and `APP`
...
logger = None
APP = None
...
def init():
"""
Initialisation of app resources, including `logger`
"""
...
APP = Flask(__name__)
...
logger = logging.getLogger()
...
...
try:
init()
except Exception as e:
logger.error(str(e))
@APP.route('/healthcheck', methods=['GET'])
def healthcheck():
"""
Healthcheck endpoint - just returns OK if the app
initialised OK.
"""
return 'OK'
@APP.route('/get_keys', method=['POST'])
def get_keys():
"""
Main endpoint - accepts a POST request from a client
containing either a CSV or JSON payload defining a set
of geographic locations, and then returns some "keys"
for these.
"""
try:
logger.info('Extracting payload')
# extract payload
logger.info('Processing for keys')
# do some stuff
...
...
except Exception as e:
logger.error("Error: {}.".format(str(e)))
# return response
我在tests
子包中的模块AppTests
中定义了Flask应用程序的单元测试
# general imports including `unittest` etc.
# import app module as `app`
class AppTests(unittest.TestCase):
"""
Flask app tests
"""
@classmethod
def setUpClass(self):
app.APP.config['TESTING'] = True
app.APP.config['DEBUG'] = False
self.app = app.APP.test_client()
# define other resources needed for `self.app`
def test_healthcheck(self):
res = self.app.get(path='/healthcheck')
self.assertEqual(res.status_code, 200)
def test_get_keys__csv(self):
# define sample csv data in `data` variable
headers = {
'Accept-Encoding': 'identity,deflate,gzip,compress',
'Content-Type': 'text/csv; charset=utf-8',
'Content-Length': len(data)
}
res = self.app.post(path='/get_keys', headers=headers.items(), data=data)
self.assertEqual(res.status_code, 200)
healthcheck
端点的测试通过,但get_key
端点的测试失败
$ python -m unittest -v AppTests.AppTests.test_get_keys__csv
test_get_keys__csv (AppTests.AppTests) ...
ERROR
======================================================================
ERROR: test_get_keys__csv (AppTests.AppTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "AppTests.py", line 105, in test_get_keys__csv
res = self.app.post(path='/get_keys', headers=headers.items(), data=data)
File "/path/to/venv/lib/python2.7/site-packages/werkzeug/test.py", line 801, in post
return self.open(*args, **kw)
File "/path/to/venv/lib/python2.7/site-packages/flask/testing.py", line 127, in open
follow_redirects=follow_redirects)
File "/path/to/venv/lib/python2.7/site-packages/werkzeug/test.py", line 764, in open
response = self.run_wsgi_app(environ, buffered=buffered)
File "/path/to/venv/lib/python2.7/site-packages/werkzeug/test.py", line 677, in run_wsgi_app
rv = run_wsgi_app(self.application, environ, buffered=buffered)
File "/path/to/venv/lib/python2.7/site-packages/werkzeug/test.py", line 884, in run_wsgi_app
app_rv = app(environ, start_response)
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1994, in __call__
return self.wsgi_app(environ, start_response)
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1985, in wsgi_app
response = self.handle_exception(e)
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1540, in handle_exception
reraise(exc_type, exc_value, tb)
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "/path/to/venv/lib/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/path/to/app.py", line 205, in get_keys
logger.error("Error: {}.".format(str(e)))
AttributeError: 'NoneType' object has no attribute 'error'
----------------------------------------------------------------------
Ran 1 test in 0.036s
FAILED (errors=1)
调用self.app.post('/get\u-keys,headers=headers.items(),data=data)
时,应用程序中get\u-keys
端点中对logger
对象的引用似乎为空。每次调用logger.info
都会在端点中生成一个异常,该异常会被捕获并记录下来,这就是我在运行端点测试时看到的
有没有一种方法可以模拟这种情况,或者如何绕过测试模块本身使用的
logger
?我不希望修改端点方法本身。在运行test\u get\u keys\u csv()
时,您可能会模拟日志导入
如果您使用的是Python2,mock
是一个单独的安装
pip install mock
然后用
from mock import patch
有关模拟的更多信息:
from mock import patch