import argparse
import unittest

from h8536.emulator.rx_probe import frame_checksum, frame_checksum_ok, parse_frame


class EmulatorRxProbeTest(unittest.TestCase):
    def test_parse_frame_accepts_five_bytes_and_appends_checksum(self):
        frame = parse_frame("04 00 00 40 00")

        self.assertEqual(frame, bytes.fromhex("04000040001E"))
        self.assertTrue(frame_checksum_ok(frame))

    def test_parse_frame_accepts_compact_checked_frame(self):
        frame = parse_frame("0780684030C5")

        self.assertEqual(frame, bytes.fromhex("0780684030C5"))
        self.assertEqual(frame_checksum(frame), 0xC5)
        self.assertTrue(frame_checksum_ok(frame))

    def test_parse_frame_rejects_wrong_length(self):
        with self.assertRaises(argparse.ArgumentTypeError):
            parse_frame("04 00 00 40")


if __name__ == "__main__":
    unittest.main()