1 files changed, 95 insertions, 0 deletions
diff --git a/stacks/daemon/test_baycom_backend.py b/stacks/daemon/test_baycom_backend.py
new file mode 100644
index 0000000..ebff5a4
--- /dev/null
+++ b/stacks/daemon/test_baycom_backend.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+"""Offline unit tests for BayComKissBackend (no kernel hardware)."""
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+from unittest.mock import patch
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path.insert(0, str(ROOT / "stacks" / "daemon"))
+
+from device_backends import BayComKissBackend, DeviceBackendConfig  # noqa: E402
+from ax25_codec import ax25_build_ui, ax25_parse_ui  # noqa: E402
+from kiss_bridge import KissDecoder, format_rx_line, kiss_data_frame  # noqa: E402
+
+
+def test_baycom_kiss_default_link() -> None:
+    cfg = DeviceBackendConfig(device_id="baycom-ser12", backend_type="baycom-kiss", baycom_modem="a")
+    backend = BayComKissBackend(cfg, on_rx=lambda _l: None)
+    assert backend._path in ("/var/run/baycom-pr/kiss", f"/var/run/baycom-pr/kiss-a")
+    assert backend.backend_type == "baycom-kiss"
+    assert backend._is_pty is True
+
+
+def test_baycom_kiss_transmit_kiss_frame() -> None:
+    cfg = DeviceBackendConfig(
+        device_id="baycom-ser12",
+        backend_type="baycom-kiss",
+        kiss_link="/var/run/baycom-pr/kiss",
+    )
+    backend = BayComKissBackend(cfg, on_rx=lambda _l: None)
+    backend._fd = 99
+    backend._kiss_active = True
+    written: list[bytes] = []
+
+    with patch("os.write", side_effect=lambda _fd, data: written.append(data) or len(data)):
+        with patch("termios.tcdrain"):
+            ok, display = backend.transmit("CB-0", "QST", "hello", ax25_ui=True)
+    assert ok, display
+    assert written and written[0].startswith(b"\xc0")
+    assert "hello" in display
+
+
+def test_baycom_kiss_rx_decode_path() -> None:
+    """RX path: KISS bytes → AX.25 UI → on_rx line (same decoder as _rx_loop)."""
+    rx_lines: list[str] = []
+    frame = ax25_build_ui("REMOTE-0", "CB-0", b"73")
+    pkt = kiss_data_frame(0, frame)
+    decoder = KissDecoder()
+    for _port, payload in decoder.feed(pkt):
+        parsed = ax25_parse_ui(payload)
+        assert parsed is not None
+        src, dst, info = parsed
+        assert src == "REMOTE"
+        assert dst == "CB"
+        assert info == b"73"
+        from kiss_bridge import format_rx_line
+
+        rx_lines.append(format_rx_line(src, dst, info, ax25_ui=True))
+    assert rx_lines and "73" in rx_lines[0]
+
+
+def test_baycom_kiss_modem_b_link() -> None:
+    cfg = DeviceBackendConfig(
+        device_id="baycom-b",
+        backend_type="baycom-kiss",
+        baycom_modem="b",
+        kiss_link="/var/run/baycom-pr/kiss-b",
+    )
+    backend = BayComKissBackend(cfg, on_rx=lambda _l: None)
+    assert backend._path == "/var/run/baycom-pr/kiss-b"
+
+
+def test_baycom_kiss_open_missing_path() -> None:
+    backend = BayComKissBackend(
+        DeviceBackendConfig(device_id="baycom-ser12", kiss_link="/nonexistent/kiss/path"),
+        on_rx=lambda _l: None,
+    )
+    assert not backend.open()
+    assert backend.status == "error-no-device"
+
+
+def main() -> int:
+    test_baycom_kiss_default_link()
+    test_baycom_kiss_modem_b_link()
+    test_baycom_kiss_transmit_kiss_frame()
+    test_baycom_kiss_rx_decode_path()
+    test_baycom_kiss_open_missing_path()
+    print("OK: baycom backend tests")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())