I'll try to explain as briefly as possible. I've got a working cache pattern that keeps a cached version of a Zope file's content and only when it changes (by > bobobase_modification_time) the cache is invalidated and recreated. Here's the gist of my test class Test(ZopeTestCase.FunctionalTestCase): def test_recreateCache(self): """ bla """ self.folder.manage_addFile('foo.js','FOO data') url = self.folder.mytool.cacheFile('foo.js') # pseudo code this time path = urlparse(url)[2] response = self.publish(path) self.assert... tests on response... _file = getattr(self.folder, 'foo.js') _file.manage_edit(_file.title, _file.content_type, filedata='new data') newurl = self.folder.mytool.cacheFile('foo.js') assert newurl != url, "url hasn't changed :(" The reason it fails on the last line is that the time difference between the first time and the second time is nil. Adding a time.sleep(1) won't change anything because the bobobase_modification_time() doesn't change. How can I solve this? Make one big transaction two without having to use transaction.get().commit() which I don't think I can use in unit tests as per Dieter's advice. Grateful for help. Peter -- Peter Bengtsson, work www.fry-it.com home www.peterbe.com hobby www.issuetrackerproduct.com