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I ran into this error running the test for my product, written using plone.app.testing on Plone 3.3.5:
ComponentLookupError: (<InterfaceClass plone.app.viewletmanager.interfaces.IViewletSettingsStorage>, '')
but the product works correctly outside of the test.
It turns out I specified the wrong version for plone.testing.
These are the correct versions to use with Plone 3.x ATM (december 2011):
The error above was caused by plone.testing being pinned to 3.0a1.