def test_io_fields(self):
msg = Message("SERIAL_OPEN", ("rx", "tx"))
self.assert_equal(2, len(msg.get_fields()))
for field in msg.get_fields():
self.assert_true(isinstance(field, Message.field_type))
for i, name, size in ((0, "rx", 0), (1, "tx", 0)):
self.assert_equal(name, msg.get_fields()[i].name)
self.assert_equal(size, msg.get_fields()[i].size)