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Marvin supports test categories which enables you to run specific tests for product areas. For example if you have made a change in the accounts product area, there's a way to trigger all accounts related tests in both smoke and component tests directories. Just put a tag 'accounts' and point the directories/files
nosetests --with-marvin --marvin-config=[config] --hypervisor=xenserver -a tags=accounts [file(s)]
More info on this wiki page: Categories