From 04d965d67a7264a1c7c211494aebda1953df7603 Mon Sep 17 00:00:00 2001
From: "info@mode42.com" <info@mode42.com>
Date: Fri, 7 Aug 2026 18:25:13 +0000
Subject: Initial push

---
 stacks/daemon/test_ax25_codec.py | 97 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 stacks/daemon/test_ax25_codec.py

(limited to 'stacks/daemon/test_ax25_codec.py')

diff --git a/stacks/daemon/test_ax25_codec.py b/stacks/daemon/test_ax25_codec.py
new file mode 100644
index 0000000..b12e43d
--- /dev/null
+++ b/stacks/daemon/test_ax25_codec.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env python3
+"""Unit tests for ax25_codec (RFC 1171 FCS + libax25 address rules)."""
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent))
+
+from ax25_codec import (  # noqa: E402
+    ax25_build_ui,
+    ax25_crc,
+    ax25_crc_valid,
+    ax25_encode_address,
+    ax25_parse_ui,
+    format_callsign,
+    parse_callsign,
+    validate_callsign,
+)
+
+
+def test_rfc1171_crc_vector() -> None:
+    body = bytes(range(256))
+    crc = ax25_crc(body)
+    frame = body + bytes((crc & 0xFF, crc >> 8))
+    assert ax25_crc_valid(frame)
+    assert crc == 0x303C
+
+
+def test_address_roundtrip() -> None:
+    raw = ax25_encode_address("DG1ABC", 7, last=True)
+    frame = ax25_build_ui("DG1ABC-7", "CQ", b"73")
+    parsed = ax25_parse_ui(frame)
+    assert parsed == ("DG1ABC-7", "CQ", b"73")
+
+
+def test_format_callsign_omit_zero_ssid() -> None:
+    assert format_callsign("DG1ABC", 0) == "DG1ABC"
+    assert format_callsign("CB", 0) == "CB"
+
+
+def test_parse_callsign_legacy() -> None:
+    assert parse_callsign("DK0WC-7") == ("DK0WC", 7)
+    assert parse_callsign("bad-ssid") == ("BAD", 0)
+
+
+def test_validate_callsign_strict() -> None:
+    assert validate_callsign("CB-0") == ("CB", 0)
+    assert validate_callsign("N0CALL-15") == ("N0CALL", 15)
+    try:
+        validate_callsign("CB_0")
+        raise AssertionError("expected ValueError")
+    except ValueError:
+        pass
+
+
+def test_ui_frame_without_fcs() -> None:
+    frame = ax25_build_ui("DG1ABC", "QST", b"hi")
+    body = frame[:-2]
+    parsed = ax25_parse_ui(body)
+    assert parsed == ("DG1ABC", "QST", b"hi")
+
+
+def test_invalid_callsign_build() -> None:
+    try:
+        ax25_build_ui("BAD_CALL", "CQ", b"x")
+        raise AssertionError("expected ValueError")
+    except ValueError:
+        pass
+
+
+def test_non_ui_rejected() -> None:
+    frame = ax25_build_ui("A", "B", b"x")
+    frame = bytearray(frame)
+    frame[14] = 0x00  # not UI control
+    assert ax25_parse_ui(bytes(frame)) is None
+
+
+def main() -> int:
+    tests = [
+        test_rfc1171_crc_vector,
+        test_address_roundtrip,
+        test_format_callsign_omit_zero_ssid,
+        test_parse_callsign_legacy,
+        test_validate_callsign_strict,
+        test_ui_frame_without_fcs,
+        test_invalid_callsign_build,
+        test_non_ui_rejected,
+    ]
+    for fn in tests:
+        fn()
+    print("OK: ax25_codec unit tests")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
-- 
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