def test_econding_transmission_invalid_signal_invalid(self):
with self.assertRaises(Exception) as ex:
nrzi('¯|_#__|¯¯¯¯¯|___')
self.assertEqual(
str(ex.exception),
'Token # is invalid int physical signal segment')
def test_econding_transmission_first_signal_invalid(self):
with self.assertRaises(Exception) as ex:
nrzi('|')
self.assertEqual(
str(ex.exception),
'Physical signal | does not start with high or low signal')
def test_encoding(self):
_expected = (
'010010000100111', '010110010', '010011000110', '010100011101')
_input = ('¯|___|¯¯¯¯¯|___|¯|_|¯', '¯|__|¯|___|¯¯',
'_|¯¯¯|_|¯¯¯¯|_|¯¯', '_|¯¯|____|¯|_|¯¯|_')
for _in, _out in zip(_input, _expected):
self.assertEqual(nrzi(_in), _out)
def test_econding_transmission_empty(self):
with self.assertRaises(Exception) as ex:
nrzi('')
self.assertEqual(str(ex.exception), 'Physical signal is empty')
def test_encoding_one_singal(self):
self.assertEqual(nrzi('_'), '0')
self.assertEqual(nrzi('_'), '0')
self.assertEqual(nrzi('¯|'), '0')
self.assertEqual(nrzi('¯|'), '0')