Unittest and dynamically created methods

[JAWS]

I get this error message when trying to run a unittest test with a
dynamically created test method:

Traceback (most recent call last):
File "unittest.py", line 215, in __call__
testMethod()
TypeError: ?() takes no arguments (1 given)


I have no clue as to where the 1 given argument comes from...
I am using python 2.2 and here is a copy of the code generating this:

#! /bin/env python

import unittest, commands, new

class Test(unittest.TestCase):
done = None

def initialization(self):
Test.port = 11000
Test.host = 'meadow'

def setUp(self):
if not Test.done:
Test.done = 1
Test.initialization(self)

def tearDown(self):
pass

def testCommandFailure(self):
status, output = commands.getstatusoutput('python
.../bin/uimClient.py' +
' -p ' + str(Test.port) + ' -h ' + Test.host)
self.assertEqual(256, status)

def testCommandFailure3(self):
status, output = commands.getstatusoutput('python
.../bin/uimClient.py' +
' -p ' + str(Test.port) + ' -h ' + Test.host)
self.assertEqual(256, status)

#====================================BASE
TEST==================================

if __name__ == '__main__':

base = 'def testCommandFailure2(self):\n\t""" Testing test1 method
"""' +\
'\n\tstatus, output = commands.getstatusoutput("python " +' + \
'" ../bin/uimClient.py -p " + str(Test.port) + " -h " +
Test.host)'+\
'\n\tself.assertEqual(status, 256)\n'
code = compile(base, 'uimClientFT.py', 'exec')
testf = new.function(code, Test.__dict__, 'testCommandFailure2')
setattr(Test, 'testCommandFailure2', testf)

print Test.__dict__
print type(Test.testCommandFailure2)

unittest.main()



J-P
thankx

 

[Peter Hansen]

I get this error message when trying to run a unittest test with a dynamically created test method:

Traceback (most recent call last):
File "unittest.py", line 215, in __call__
testMethod()
TypeError: ?() takes no arguments (1 given)

I can't say offhand, but the above error might give you a hint:
it appears it's trying to report the name of the method, but
doesn't have it (thus the ?() part). Maybe you should examine
the dynamic creation of the method more closely. Have you
passed the name parameter in the right place?

-Peter

 

[Duncan Booth]

I get this error message when trying to run a unittest test with a
dynamically created test method:

Traceback (most recent call last):
File "unittest.py", line 215, in __call__
testMethod()
TypeError: ?() takes no arguments (1 given)

base = 'def testCommandFailure2(self):\n\t""" Testing test1 method
"""' +\
'\n\tstatus, output = commands.getstatusoutput("python " +' + \
'" ../bin/uimClient.py -p " + str(Test.port) + " -h " +
Test.host)'+\
'\n\tself.assertEqual(status, 256)\n'
code = compile(base, 'uimClientFT.py', 'exec')
testf = new.function(code, Test.__dict__, 'testCommandFailure2')
setattr(Test, 'testCommandFailure2', testf)

Try adding:
import dis
dis.dis(code)
and it should become obvious. Effectively your code is the same as:

def testf():
def testCommandFailure2(self):
... whatever ...
Test.testCommandFailure2 = testf

so when Test.testCommandFailure2 is called it gets passed a self parameter
which it wasn't expecting.

In short, compiling code which contains a def statement doesn't execute the
def statement until you execute the code.

P.S. I don't know what you are trying to do, but I expect you can achieve
whatever it is you are trying to do more cleanly by not compiling any code
on the fly.