Hello Pythonistas!
Below you will find example code distilled from a set of unit tests,
usable with Python 2 or 3. I'm using a loop over a list of parameters to
generate tests with different permutations of parameters. Instead of
calling util() with values 0-4 as I would expect, each call uses the
same parameter 4. What I found out is that the name 'i' is resolved when
Foo.test_1 is called and not substituted inside the for-loop, which
finds the global 'i' left over from the loop. A simple "del i" after the
loop proved this and gave me an according error.
Now, I'm still not sure how to best solve this problem:
* Spell out all permutations is a no-go.
* Testing the different iterations inside a single test, is
inconvenient because I want to know which permutation exactly fails and
which others don't. Further, I want to be able to run just that one
because the tests take time.
* Further, I could generate local test() functions using the current
value of 'i' as default for a parameter, which is then used in the call
to self.util(), but that code is just as non-obviously-to-me correct as
the current code is non-obviously-to-me wrong. I'd prefer something more
stable.
Any other suggestions?
Thank you!
Uli
# example code
from __future__ import print_function
import unittest
class Foo(unittest.TestCase):
def util(self, param):
print('util({}, {})'.format(self, param))
for i in range(5):
def test(self):
self.util(param=i)
setattr(Foo, 'test_{}'.format(i), test)
unittest.main()
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