Stop coverage, save data to file and set the list of coverage objects to report on.

def finish(self):
        """Stop coverage, save data to file and set the list of coverage objects to report on."""

        self.unset_env()
        self.cov.stop()
        self.cov.combine()
        self.cov.save()
        node_desc = self.get_node_desc(sys.platform, sys.version_info)
        self.node_descs.add(node_desc)