[TIP] Unable to setattr to self class and nosetests not picking up the things.

[M S Vishwanath Bhat]

On 7 April 2014 19:14, Alfredo Deza <alfredo at deza.pe> wrote:

>
> On Apr 7, 2014, at 9:21 AM, M S Vishwanath Bhat <msvbhat at gmail.com> wrote:
>
> > Hi,
> >
> > I'm a n00b to python and still learning tricks of the trade.
> >
> > I have a test framework, where I am populating the tests based on some
> criteria and/or the number of tests present.
>
> But that is something that is usually taken care of for you by the test
> framework (Nose in your case). You should be able to do that
> without the need to alter the collection process directly in the class.
>
>
> > I am making use of unittest + nose to to this. But unfortunately it is
> not working as expected and I don't know why.
>
> You should not use __init__ here, test setup is usually done in the setUp
> method when using unittest.TestCase. You should try using
> that instead and see if you get any further.
>
> >
> > Below is my code
> >
> > class MyTests(unittest.TestCase):
> >     def __init__(self, *args, **kwargs):
> >         print "Extending __init__ of mother class"
> >         super(MyTests, self).__init__(*args, **kwargs)
> >         self.ts = []
> >         for f in os.listdir("example"):
> >             if f.startswith("test_") and  f.endswith(".py"):
> >                 m = __import__('example.' + f.replace(".py", ""))
> >                 self.ts += util.testcases
> >
> >         for i, t in self.ts:
> >             print i ,t    # IT PROPERLY PRINTS STUFF HERE. AS EXPECTED.
> >             setattr(self, "test_%s" %i, t)  # BUT THIS DOES NOT WORK AS
> EXPECTED
> >
> >     def test_one(self):
> >         pass
> >
> > if __name__ == '__main__':
> >     unittest.main()
> >
> > testcase is a decorator which populates the things inside list. And the
> list is being populated because I can see that in the print statement.
>
> You are setting attributes on a method, but I don't think that will work
> on a method. If you are trying to set some values for a test to use
> then you might want to set them in the setUp method.
>
Thanks Alfred for replying.

I thought I was setting it on the class. How do I set it on the class then?

And how do I make setup and teardown to run only once for entire test
suite?

>
> But I am still not sure why are you importing modules there, cannot see
> what util.testcases is, and not sure where is the decorator.
>
When I import them, decorator populate them inside a list which. And I use
them to do setattr.

This is my decorator function.
def testcase(name):
    global testcases
    def decorator(func):
        def wrapper(self):
            ret = func(self)
            self.assertTrue(ret)
            return ret
        testcases.append((name, wrapper))
        return wrapper

    return decorator

MS


>
> >
> > I have couple of questions here.
> >
> > 1. Without the test_one (which is a dummy function), The __init__
> function is not called at all. Only when I have that dummy function,
> __init__ is being executed. Anybody know why?
> >
> > 2. I'm not sure if setattr is working properly, because the output says
> >
> > Extending __init__ of mother class
> > testcase_one <function wrapper at 0x1ab3c08>
> > testcase_two <function wrapper at 0x1ab3cf8>
> > testcase_one <function wrapper at 0x1ab3c08>
> > testcase_two <function wrapper at 0x1ab3cf8>
> > Something <function wrapper at 0x1ab3de8>
> > .
> > ----------------------------------------------------------------------
> > Ran 1 test in 0.000s
> >
> > OK
> >
> >
> > Again other tests are not being executed. Only dummy is being executed.
> >
> > 3. nosetests doesn't pick any of these. It just picks up the class and
> executes that one test_one function.
> >
> > I thought this list would have some unittest + nosetests experts. Any
> help is appreciated.
> >
> > Thanks,
> > MS
> >
> > _______________________________________________
> > testing-in-python mailing list
> > testing-in-python at lists.idyll.org
> > http://lists.idyll.org/listinfo/testing-in-python
>
>
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