assertraises behaviour

Prasad, Ramit ramit.prasad at jpmorgan.com
Tue Jul 17 23:04:57 CEST 2012


> On 17/07/2012 18:49, Prasad, Ramit wrote:
> >>> import unittest
> >>>
> >>> class TestWithRaises(unittest.TestCase):
> >>>       def test_first(self):
> >>>           assert False
> >>>
> >>>       def test_second(self):
> >>>           print("also called")
> >>>           assert True
> >>>
> >>> if __name__ == '__main__':
> >>>       unittest.main()
> >>>
> >>> in this case also the second test is run even if the first fails..
> >>
> >> The reason for that is that the unit testing framework catches and
> >> handles the error. It calls both test functions in some unspecified
> >> order and logs the result. Calls to two separate test functions are
> >> thereby separated from each other. This is intentionally so, but I think
> >> you can also give the unit testing framework a flag that makes it abort
> >> after the first error. In no way will the exception escape from the
> >> unittest.main() call though, it is all caught and handled inside, also
> >> by intention.
> >>
> >>
> >>> But that's probably easy because we just need to catch exceptions for
> >>> every method call, so it's not exactly the same thing..
> >>
> >> I don't understand what you want to say here. I also don't understand
> >> what your problem in general is. I guess there are some expectations
> >> which are not satisfied, but you haven't explained those explicitly yet.
> >>
> >
> > I think Andrea wants to do the same thing but with nose and not
> > unittest.
> >
> > Ramit
> >
> 
> Do what?  Like Ulrich Eckhart I simply don't understand what she's
> getting at.  Perhaps it's a problem with Englsh being a second language
> issue rather than Python itself.  Thankfully I'm sure that everything
> will come out in the wash.
> 
> --
> Cheers.
> 
> Mark Lawrence.


I get the impression that nose stops running tests once any test 
fails instead of running all tests and listing all the tests and 
their pass/fail status (like unittest). Granted that is just what 
I get from the context as I read it as I have no knowledge of nose.

Ramit
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