refactor(webui): move media replay helpers out of websocket channel

tests/utils/test_webui_websocket_logging.py

@@ -0,0 +1,38 @@
+"""Tests for WebUI websocket logging helpers."""
+
+from __future__ import annotations
+
+import logging
+
+from nanobot.webui.websocket_logging import (
+    OPENING_HANDSHAKE_FAILED_MESSAGE,
+    WebSocketHandshakeNoiseFilter,
+)
+
+
+def _log_record(message: str, exc: BaseException) -> logging.LogRecord:
+    return logging.LogRecord(
+        name="websockets.server",
+        level=logging.ERROR,
+        pathname=__file__,
+        lineno=1,
+        msg=message,
+        args=(),
+        exc_info=(type(exc), exc, exc.__traceback__),
+    )
+
+
+def test_websocket_handshake_noise_filter_suppresses_disconnects() -> None:
+    filter_ = WebSocketHandshakeNoiseFilter()
+    wrapped = RuntimeError("wrapped")
+    wrapped.__cause__ = BrokenPipeError(32, "Broken pipe")
+
+    assert not filter_.filter(_log_record(OPENING_HANDSHAKE_FAILED_MESSAGE, BrokenPipeError()))
+    assert not filter_.filter(_log_record(OPENING_HANDSHAKE_FAILED_MESSAGE, wrapped))
+
+
+def test_websocket_handshake_noise_filter_keeps_real_errors() -> None:
+    filter_ = WebSocketHandshakeNoiseFilter()
+
+    assert filter_.filter(_log_record(OPENING_HANDSHAKE_FAILED_MESSAGE, RuntimeError("boom")))
+    assert filter_.filter(_log_record("connection handler failed", BrokenPipeError()))