def METHOD_NAME(mocker, db, oaisets):
    """Test caching for OAISets."""
    cache = {}
    rec = {
        '_oai': {
            'sets': ['user-c1', 'extra', ],
        }
    }
    update_oaisets_cache(cache, rec)
    assert cache['user-c1'].search_pattern is None
    assert cache['extra'].search_pattern == 'title:extra'  # see in conftest
    query_mock = mocker.patch.object(OAISet, 'query')
    # Mock the sqlalchemy query API
    q_result_mock = MagicMock()
    q_result_mock.count = 1
    q_result_mock.one().search_pattern = None
    query_mock.filter_by = MagicMock(return_value=q_result_mock)
    r = {
        'communities': ['c1', 'c2'],
        '_oai': {
            'id': 'some_id_1234',
            'updated': 'timestamp',
            'sets': ['user-c1', 'extra', 'user-c2']
        }
    }
    assert not requires_sync(r, cache=cache)  # Should not require sync
    # Should be only called once for the item not in cache
    query_mock.filter_by.assert_called_once_with(spec='user-c2')