[Python-Dev] Proposed unittest changes

Jonathan Lange jml at mumak.net
Fri Apr 18 00:40:21 CEST 2008

On Fri, Apr 18, 2008 at 8:34 AM, Guido van Rossum <guido at python.org> wrote:
> On Thu, Apr 17, 2008 at 3:31 PM, Jonathan Lange <jml at mumak.net> wrote:
>  > On Thu, Apr 17, 2008 at 11:49 PM, Michael Foord
>  >  <fuzzyman at voidspace.org.uk> wrote:
>  >  >     assert_raises_with_message    (exc_class, message, callable, *args,
>  >  >  **keywargs)
>  >  >
>  >
>  >  I don't think this one should go in.
>  >
>  >  I think it would be better if assertRaises just returned the exception
>  >  object that it catches. That way, you can test properties of the
>  >  exception other than its message.
>  Hm. I've got to say that returning the exception object is, um, an odd
>  API in the set of unittest APIs. I can see how it's sometimes more
>  powerful, but I'd say that in many cases assertRaisesWithMessage will
>  be easier to write and read. (And making it a regex match would be
>  even cooler.)

I don't know about odd. It works and it's not obviously terrible.

Not having it the unittest API simply means that people who do want to
test non-message properties will rewrite assertRaises. Which is, in
fact, what we've already done.


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