[Zope-dev] zope.testing.testrunner.debug.post_mortem and try/finally

[Ross Patterson]

Tres Seaver <tseaver at palladion.com> writes:

> Ross Patterson wrote:
>> When a try/finally clause is (appropriately) used to do cleanup after an
>> exception during a test run, it often tears down parts of the fixture
>> that are needed in order to do useful post_mortem debugging of the
>> exception, such as closing the request or db connections.  What is the
>> best way to do post_mortem debugging with the stack in the state it was
>
>> at the time of the exception?
>> 
>> For a while now, I've been repeatedly modifying eggs in my development
>> environment at the relevant try/finally clauses to invoke post_mortem
>> before the tear down is done, sub-optimal to say the least.  :)  I find
>> myself doing it often its time to invest in a better way.
>> 
>> Is there some Python voodoo I'm unaware of to get a post_mortem to
>> reflect the stack before try/finally clauses?  If not, is putting
>> some sort of hook into the relevant try/finally clauses the best way to
>> address this?  If not, what should I be doing?
>> 
>> If putting hooks into the try/finally clauses is the right way, then it
>> would be nice to have a somewhat canonical way to do this.  It would
>> also be nice to have a way to pass something down the line so that
>> post_mortem() only gets called once per exception.
>
> Are you using try:...finally:... inside your testcase methods?  If so,
> why not just move the cleanup invocation into your 'tearDown' for the
> testcase class:  at that point, the '-D' option to the testrunner will
> stop you at the error, with the tearDown not yet called.

I'm sorry, I was unclear, the try/finally clauses are not necessarily in
*test tearDown* methods (though I used that language), they are often a
part of the application being tested, such as closing the request,
closing DB connections, or aborting transactions.

> Or are you doing this in doctests?  If so, move the code you are testing
> into a real testing framework. ;)

Oh, goody.  Derogatory evangelism.  :)  Doctests have tearDown just like
other tests.

Ross