Testing memoized methods

For a recent Plone project we needed to write unit tests for methods that were using plone.memoize for caching return values. With a standard Plone's PloneTestCase I got the following error: Error in test test_main_image (niteoweb.elcond.tests.test_stol.TestContent) Traceback (most recent call last): File "/Users/zupo/work/python/parts/opt/lib/python2.6/unittest.py", line 279, in run testMethod() File "/Users/zupo/work/niteoweb.elcond/src/niteoweb/elcond/tests/test_stol.py", line 75, in test_main_image image = self.portal.stol.main_image() File "/Users/zupo/work/niteoweb.elcond/src/niteoweb/elcond/content/stol.py", line…