"""Tests for DiscussionSettings 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 DiscussionSettings


def test_constructor_with_kwargs() -> None:
 ds = DiscussionSettings(temperature=0.5, top_p=0.9, max_output_tokens=2048)
 assert ds.temperature == 0.5
 assert ds.top_p == 0.9
 assert ds.max_output_tokens == 2048


def test_field_access() -> None:
 ds = DiscussionSettings(temperature=0.0)
 assert ds.temperature == 0.0


def test_frozen_raises_on_mutation() -> None:
 ds = DiscussionSettings()
 with pytest.raises(FrozenInstanceError):
  ds.temperature = 0.5


def test_to_dict_roundtrip() -> None:
 ds = DiscussionSettings(temperature=0.3, top_p=0.7, max_output_tokens=1024)
 d = ds.to_dict()
 assert d["temperature"] == 0.3
 assert d["top_p"] == 0.7
 assert d["max_output_tokens"] == 1024


def test_default_values() -> None:
 ds = DiscussionSettings()
 assert ds.temperature == 0.7
 assert ds.top_p == 1.0
 assert ds.max_output_tokens == 0


def test_hashability() -> None:
 ds = DiscussionSettings(temperature=0.5)
 assert hash(ds) is not None