'Mock side effect for _get_volume_metadata_value.'

@staticmethod
def gvmv_side_effect(arg1, arg2):

    if (arg2 == 'Secondary_datanode_key'):
        return '{9876}'
    elif (arg2 == 'Secondary_datanode_ip'):
        return '192.0.2.2'
    elif (arg2 == 'current_dn_ip'):
        return '192.0.2.1'
    elif (arg2 == 'vsa_ip'):
        return '192.0.2.1'
