"""Test the platform-branched PTY bridge import in hermes_cli.web_server_chat.

The /api/pty WebSocket handler picks its bridge at import
time via ``sys.platform.startswith("win")`` — Windows gets the ConPTY
backend, POSIX gets the fcntl/termios one.  Both branches must:

  1. Expose ``PtyBridge`` as the bridge class (or None) and
     ``PtyUnavailableError`` as an exception class.
  2. Set ``_PTY_BRIDGE_AVAILABLE`` correctly.
  3. Never raise at import time when the platform-native dependency is
     missing — the dashboard's non-chat tabs must keep loading.

This test asserts the live POSIX state (the Linux CI lane).
"""

from __future__ import annotations

import sys

import pytest

import hermes_cli.web_server_chat as _web_server_chat

@pytest.mark.platforms("posix")  # POSIX-only
def test_web_server_uses_posix_pty_bridge_on_posix():
    """On POSIX, the bridge must be the fcntl/termios PtyBridge."""
    from hermes_cli.pty_bridge import PtyBridge as PosixBridge
    from hermes_cli.pty_bridge import PtyUnavailableError as PosixErr

    assert _web_server_chat.PtyBridge is PosixBridge
    assert _web_server_chat._PTY_BRIDGE_AVAILABLE is True
    assert _web_server_chat.PtyUnavailableError is PosixErr