Hi all,
I'm trying to make an existing testsuite py.test compatible.
At the moment, we use nose as test runner. I stumbled upon the following
(simplified example).
from functools import partial
def forall_cases(cases):
def decorate(testfn):
def gen():
for case in cases:
description = case[0]
args = case[1:]
func = partial(testfn, *args)
func.description = description
yield func,
gen.__name__= 'test_%s_' % testfn.__name__
#
# inject the generator into the module testfn came from
#
gen.__module__ = testfn.__module__
return gen
return decorate
@forall_cases([['case1', 1, 1], ['case2', 2, 2],['case3', 3, 4]]) def
test_equal(a, b):
assert a == b
If I run this with nosetests, I get 3 test cases, 2 pass and 1 fail.
py.test tries to call inspect.getsource on the partial object, which
results in a TypeError:
$ py.test -v
...
INTERNALERROR>
INTERNALERROR> object = <functools.partial object at 0x00F019C0>
INTERNALERROR>
INTERNALERROR> def getfile(object):
INTERNALERROR> """Work out which source or compiled file an
INTERNALERROR> object was d
efined in."""
...
INTERNALERROR> > raise TypeError('arg is not a module, class,
method, '
INTERNALERROR> 'function, traceback, frame, or
INTERNALERROR> code obje
ct')
INTERNALERROR> E TypeError: arg is not a module, class, method,
function,
traceback, frame, or code object
INTERNALERROR>
INTERNALERROR> object = <functools.partial object at 0x00F019C0>
INTERNALERROR>
INTERNALERROR> c:\Python26\lib\inspect.py:418: TypeError
This seems to be a documented limitation of inspect.getsource
(functools.partial returns a partial object, not a function).
I can fix this by replacing functools.partial with code given as roughly
equivalent in the python documentation:
def partial(func, *args, **keywords):
def newfunc(*fargs, **fkeywords):
newkeywords = keywords.copy()
newkeywords.update(fkeywords)
return func(*(args + fargs), **newkeywords)
newfunc.func = func
newfunc.args = args
newfunc.keywords = keywords
return newfunc
But I was certainly not expecting this. The default behavior of py.test
is even more puzzling, as it fails silently:
fba...@mn-eng-lt-fb ~/My Documents/Software/pytestbug1 $ py.test
============================= test session starts
============================= platform win32 -- Python 2.6.5 --
pytest-1.3.3 test path 1: c:\docume~1\fbauer\My
Documents\Software\pytestbug1
test_case.py ..
In my actual code, the forall_cases decorator lives in a utils module.
Is there a conditional flag that can tell me whether I'm running under
py.test? Then I could start experimenting with parametric tests using
funcargs, while keeping the test suite runnable with nose at the moment.
I still have a bug in the test suite, as I have tests passing under nose
that fail under py.test...
Best regards,
Florian
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