def test_save_msg(msg='hahah', tag='test tag', talker='admin',
expiry=None, time=None, force_create=True):
"""test save a message"""
interface = DataTransfer(Database(PATH))
msg = MsgWithTag(msg, tag, talker, expiry, time)
interface.save_msg(msg, force_create=force_create)
assert interface.get_msg_by_id(1) is not None
def test_del_msg_by_id():
"""test delete a message"""
interface = DataTransfer(Database(PATH))
interface.del_msg_by_id(1)
assert interface.get_msg_by_id(1) is None