'Set up method'

def setUp(self):

    super(DiscussionXBlockImportExportTests, self).setUp()
    self.keys = ScopeIds('any_user', 'discussion', 'def_id', 'usage_id')
    self.runtime_mock = mock.Mock(spec=Runtime)
    self.runtime_mock.construct_xblock_from_class = mock.Mock(side_effect=self._construct_xblock_mock)
    self.runtime_mock.get_policy = mock.Mock(return_value={})
    self.id_gen_mock = mock.Mock()
