def testEmptyDeb(self):
        r = policytest.DummyRecipe(self.cfg)
        os.mkdir('/'.join((r.macros.builddir, r.theMainDir)))
        # add an archive that has a file with group write permissions
        a = source.Archive(r, 'testempty.deb', dir='/')
        self.assertRaises(source.SourceError, a.doAction)