def fetch_realm(self, uri):
        raise NotImplementedError()

    ##### Storage Volumes #####
Test the _write_cell() method for formulas.
dataset/ETHPy150Open bmbouter/Opus/opus/lib/prov/deltacloud_old/deltacloud.py/Deltacloud.fetch_realm--crossover with--dataset/ETHPy150Open jmcnamara/XlsxWriter/xlsxwriter/test/worksheet/test_write_cell.py/TestWriteCell.test_write_cell_formula01