You can usually commit a subtransaction to get a _p_jar and oid (I think) set. 
You can still abort this at the end of the test to clean up.



On Monday 28 July 2003 12:39 pm, Paul Winkler wrote:
> I'm trying to write a functional test that verifies that an instance
> of my Product works correctly after it's been exported and re-imported.
> I'm stuck on how to give the test object a valid _p_oid which is needed
> to do the export.
> Background:
> This Product is a dynamic content object for CMF. Its behavior depends on 
> another CMF type instances, which it keeps a path to. So I need to ensure
> that things work even when one or both objects have moved. I've got
> moving & renaming handled well and now I want to test import/export.
> So my test suite sets up a dummy CMF instance. I do this by swiping 
> stuff from the CMFCore and CMFDefault tests; I subclass SecurityRequestTest
> and then do
>     manage_addCMFSite(self.root, 'cmf_test_site' )
> = self.root.cmf_test_site
> I've also got a portal folder in the site which I keep a handy 
> reference to as self.fol1. 
> All tests are passing, now I move on to writing the export / import tests.
> Let's say the object I want to export is self.cmf_test_site.fol1.cp1.
> I have a shorthand reference to this stored as self.cp1.
> So I think the first thing I need to do is get the export data
> like this:
>     data self.fol1.manage_exportObject('cp1', download=1)
> ... and once that works, I'll use the same data to do an import.
> But the export fails. Using pdb and browsing some source I've learned 
> that cp1 needs a _p_jar and _p_oid in order to be exported.  
> The _p_jar I've already dealt with in my move / rename tests, by swiping
> a hack from CMFCore/tests/
>     id = self.cp1.getId()
>     # WAAAA! must get _p_jar set
>     old, self.cp1._p_jar = self.cp1._p_jar, self.root._p_jar
>     try:
>         data = self.fol1.manage_exportObject(id, download=1)
>     finally:
>         self.cp1._p_jar = old
> That seems to work fine. 
> But now I'm stuck on _p_oid. How do I give the object a valid one?
> I'm sure I can't just use the same trick and swipe the _p_oid of the app 
> root :-P
> I must say that using pyunit to write functional tests for zope 2 / CMF 
> is a royal pain. It requires too much knowledge of implementation.
> (why should i need to worry about _p_foo???)
> Also I've found that if there's an error in your class' setUp(),
> it can cause the test to hang and never show you a traceback.
> -- 
> Paul Winkler
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