Session().commit()

def _set_settings(*kvtseq):

    session = Session()

    for kvt in kvtseq:

        assert len(kvt) in (2, 3)

        k = kvt[0]

        v = kvt[1]

        t = kvt[2] if len(kvt) == 3 else 'unicode'

        setting = Setting.create_or_update(k, v, t)

        session.add(setting)

@pytest.yield_fixture

def set_test_settings():

    """Restore settings after test is over."""

    # Save settings.

    settings_snapshot = [

        (s.app_settings_name, s.app_settings_value, s.app_settings_type)

        for s in Setting.query().all()]

    yield _set_settings

    # Restore settings.

    session = Session()