"""Tests for HistoryMessage in src/type_aliases.py

Per-aggregate dataclass regression-guard for the metadata_promotion_20260624 track.

CONVENTION: 1-space indentation. NO COMMENTS.
"""
from __future__ import annotations

from dataclasses import FrozenInstanceError

import pytest

from src.type_aliases import HistoryMessage


def test_constructor_with_kwargs() -> None:
 msg = HistoryMessage(role="user", content="hi", name="alice")
 assert msg.role == "user"
 assert msg.content == "hi"
 assert msg.name == "alice"


def test_field_access() -> None:
 msg = HistoryMessage(role="assistant", tool_call_id="call_123")
 assert msg.tool_call_id == "call_123"


def test_frozen_raises_on_mutation() -> None:
 msg = HistoryMessage()
 with pytest.raises(FrozenInstanceError):
  msg.role = "user"


def test_to_dict_from_dict_roundtrip() -> None:
 msg = HistoryMessage(role="user", content="hi", tool_call_id="c1")
 restored = HistoryMessage.from_dict(msg.to_dict())
 assert restored == msg


def test_from_dict_filters_unknown_keys() -> None:
 raw = {"role": "user", "content": "hi", "extra_unknown_key": "x"}
 msg = HistoryMessage.from_dict(raw)
 assert msg.role == "user"
 assert msg.content == "hi"


def test_default_values() -> None:
 msg = HistoryMessage()
 assert msg.role == "user"
 assert msg.content == ""
 assert msg.tool_calls == ()


def test_hashability() -> None:
 msg = HistoryMessage(role="user")
 assert hash(msg) is not None