Hi!
I'm having problems using a metaclass to generate test functions. This
works when I try to run all tests from the module or test case, but it
fails when I'm trying to specify a single test function. My environment
is Python 2.7.3 on MS Windows 7 at the moment. It should be upgraded to
at least 2.7.4 or better to 3, but see the notes on Python 3 below.
# my_module.py
import unittest
class X(unittest.TestCase):
def __metaclass__(name, bases, dict):
# attach function
def test(self):
pass
dict['test_1'] = test
dict['test_2'] = test
# create class
return type(name, bases, dict)
The error when I'm trying to run "python -m unittest my_module.X.test_1"
is: "Value error: no such test method in <class 'my_module.X'>: test".
The astonishing part is that it claims that "test" is not found while I
asked it to run "test_1". The name it complains about is the name of the
function inside the metaclass function. In all other cases, like e.g.
giving "-v" it reports the correct function name. My question here is
whether I'm doing something wrong or whether I discovered a bug.
Now, concerning Python 3, it fails to detect any test case at all! My
guess is that the unittest library was changed to use metaclasses itself
in order to detect classes derived from unittest.TestCase. Therefore,
overriding the metaclass breaks test case discovery. My question in that
context is how do I extend metaclasses instead of overriding it? In
other words, what is the equivalent to super() for class creation?
Thank you for your help!
Uli
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