"""Tests for ToolDefinition 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 ToolDefinition


def test_constructor_with_kwargs() -> None:
 td = ToolDefinition(name="read_file", description="read a file", auto_start=True)
 assert td.name == "read_file"
 assert td.description == "read a file"
 assert td.auto_start is True


def test_field_access() -> None:
 td = ToolDefinition(name="x", parameters={"type": "object"})
 assert td.parameters == {"type": "object"}


def test_frozen_raises_on_mutation() -> None:
 td = ToolDefinition()
 with pytest.raises(FrozenInstanceError):
  td.name = "x"


def test_to_dict_from_dict_roundtrip() -> None:
 td = ToolDefinition(name="f", description="d", auto_start=True, parameters={"k": "v"})
 restored = ToolDefinition.from_dict(td.to_dict())
 assert restored == td


def test_from_dict_filters_unknown_keys() -> None:
 raw = {"name": "x", "extra_unknown_key": "ignored"}
 td = ToolDefinition.from_dict(raw)
 assert td.name == "x"


def test_default_values() -> None:
 td = ToolDefinition()
 assert td.name == ""
 assert td.description == ""
 assert td.parameters == {}
 assert td.auto_start is False


def test_hashability_skipped_unhashable_dict_field() -> None:
 td = ToolDefinition()
 assert td.parameters == {}