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#!/usr/bin/env python3
"""Unit tests for Bell 202 frequency-toggle line code."""
from __future__ import annotations
import sys
from pathlib import Path
LIB = Path(__file__).resolve().parent
sys.path.insert(0, str(LIB))
from bell202_line_code import decode_tones_to_bits, encode_bits_to_tones # noqa: E402
def test_roundtrip_single_byte() -> None:
bits = bytes([0x55]) # 01010101 → many toggles
tones = encode_bits_to_tones(bits, start_tone=0)
back = decode_tones_to_bits(tones, start_tone=0)
assert back == bits
def test_all_ones_no_toggle() -> None:
tones = encode_bits_to_tones(bytes([0xFF]), start_tone=0)
assert len(set(tones)) == 1
def main() -> int:
test_roundtrip_single_byte()
test_all_ones_no_toggle()
print("OK: bell202_line_code tests")
return 0
if __name__ == "__main__":
raise SystemExit(main())
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