def tearDown(self):
        volumes_snapshot_page = \
            self.home_pg.go_to_compute_volumes_volumesnapshotspage()
        volumes_page = volumes_snapshot_page.switch_to_volumes_tab()
        volumes_page.delete_volume(self.VOLUME_NAME)
        volumes_page.find_message_and_dismiss(messages.SUCCESS)
        self.assertTrue(volumes_page.is_volume_deleted(self.VOLUME_NAME))
        super(TestVolumeSnapshotsBasic, self).tearDown()
Verify that a missing widget class is rejected.
dataset/ETHPy150Open openstack/horizon/openstack_dashboard/test/integration_tests/tests/test_volume_snapshots.py/TestVolumeSnapshotsBasic.tearDown--crossover with--dataset/ETHPy150Open twisted/nevow/nevow/test/test_athena.py/WidgetSubcommandTests.test_invalidMissingWidget