def _create_cg_with_member(vnx_gf):
lun_name = vnx_gf.add_lun_name()<EOL>lun = vnx_gf.pool.create_lun(lun_name)<EOL>cg_name = vnx_gf.add_cg_name()<EOL>cg = vnx_gf.vnx.create_cg(cg_name)<EOL>cg.add_member(lun)<EOL>return cg<EOL>
Helper function to create a cg with a lun

    :param vnx_gf: the vnx general test fixture
    :return: created cg