[TIP] Functions for tests instead of classes

Michael Foord fuzzyman at voidspace.org.uk
Thu Mar 4 16:27:15 PST 2010

On 05/03/2010 00:19, Ryan Freckleton wrote:
> On Thu, Mar 4, 2010 at 3:33 PM, Michael Foord 
> <fuzzyman at voidspace.org.uk <mailto:fuzzyman at voidspace.org.uk>> wrote:
>     On 04/03/2010 22:03, Ryan Freckleton wrote:
>>     On Wed, Mar 3, 2010 at 12:15 PM, Michael Foord
>>     <fuzzyman at voidspace.org.uk <mailto:fuzzyman at voidspace.org.uk>> wrote:
>>     <snip>
>>         Once Holger and Benjamin have worked on their ast
>>         transformation code it should be possible to add this to
>>         simpletest for better failure messages with plain asserts.
>>     <snip>
>>     Does that mean we're going to get pretty asserts through ast
>>     transforms? As in:
>     Well, not in unittest itself but in some extension of unittest...
>     There is an implementation that could be adapted fairly easily:
>     http://bitbucket.org/hpk42/py-trunk/src/tip/py/_code/_assertionnew.py
>     This uses the ast module which is new in Python 2.6, but it could
>     be backported to use _ast for Python 2.5. There is also an old
>     version called "_assertionold.py" that uses the compiler module
>     present in Python 2.4.
> Cool, I'll look at that in detail.
>     There is also code in nose that does something similar (stack
>     introspection rather than ast transformation I *believe*) in nose.
>     If unittest had a good extension API this could just be
>     implemented as a unittest extension...
> Thanks for the pointers, once I get some more free cycles I'll try to 
> implement a "pretty asserts" module. Hopefully it can end up being one 
> of the first unittest2 extensions :)

It will need the extensibility mechanism in place to be generally usable 
with unittest2.

For simpletest you could wrap it around the functions easily enough - 
catching AssertionError and then doing the ast transform and rerun, 
raising a 'better' exception on failure. When I say easily enough that 
is for some unspecified value of 'easily' of course (the wrapping is 
easy it is untangling the ast transform code from py.test that will take 
a little bit of work)...

Anyway - I'll be interested in what you come up with.


>     All the best,
>     Michael
> =====
> --Ryan E. Freckleton


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