def filename_url_pairs(self, year=None):
        raise NotImplementedError()
Tests that slices are deleted correctly from the OM to FV
dataset/ETHPy150Open openelections/openelections-core/openelex/base/datasource.py/BaseDatasource.filename_url_pairs--crossover with--dataset/ETHPy150Open fp7-ofelia/ocf/optin_manager/src/python/openflow/optin_manager/xmlrpc_server/tests.py/Tests.test_delete_slice