How can I test 'warnings' from testsuite?

[billiejoex]

Hi there,
into a module of mine I 'warn' a message if a certain situation
occurs:


def add_anonymous_user(permissions=('r'):
if 'w' in p:
import warnings
warnings.warn("it's not rencommended assigning 'w'
permission to anonymous user.", RuntimeWarning, stacklevel=2)


I'd like to test such event from test suite ("fail test if warn is not
raised") but don't know how.

Any suggestion?

 

[attn.steven.kuo]

Hi there,
into a module of mine I 'warn' a message if a certain situation
occurs:

def add_anonymous_user(permissions=('r'):
if 'w' in p:
import warnings
warnings.warn("it's not rencommended assigning 'w'
permission to anonymous user.", RuntimeWarning, stacklevel=2)

I'd like to test such event from test suite ("fail test if warn is not
raised") but don't know how.

Any suggestion?

You can (temporarily) change warnings to exceptions
for the purposes of testing; see filterwarnings in
the warnings module. E.g.,

import warnings
import unittest

def foo():
warnings.warn("Foo", RuntimeWarning, stacklevel=2)

class testWarn(unittest.TestCase):
def setUp(self):
warnings.filterwarnings("error")
def test_1(self):
self.assertRaises(RuntimeWarning, foo)
def tearDown(self):
warnings.resetwarnings()

s = unittest.TestSuite()
s.addTest(unittest.makeSuite(testWarn))

if __name__ == '__main__':
import sys
sys.argv.append('-v')
unittest.TextTestRunner(verbosity=2).run(s)

 

[billiejoex]

You can (temporarily) change warnings to exceptions
for the purposes of testing; see filterwarnings in
the warnings module. E.g.,

import warnings
import unittest

def foo():
warnings.warn("Foo", RuntimeWarning, stacklevel=2)

class testWarn(unittest.TestCase):
def setUp(self):
warnings.filterwarnings("error")
def test_1(self):
self.assertRaises(RuntimeWarning, foo)
def tearDown(self):
warnings.resetwarnings()

s = unittest.TestSuite()
s.addTest(unittest.makeSuite(testWarn))

if __name__ == '__main__':
import sys
sys.argv.append('-v')
unittest.TextTestRunner(verbosity=2).run(s)

This is exactly what I was searching for.
Thank you very much.