"""Tests for ProviderPayload 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 ProviderPayload


def test_constructor_with_kwargs() -> None:
 pp = ProviderPayload(script="echo hi", args={"x": 1}, output="hi", source_tier="tier2")
 assert pp.script == "echo hi"
 assert pp.args == {"x": 1}
 assert pp.output == "hi"
 assert pp.source_tier == "tier2"


def test_field_access() -> None:
 pp = ProviderPayload(script="ls")
 assert pp.script == "ls"


def test_frozen_raises_on_mutation() -> None:
 pp = ProviderPayload()
 with pytest.raises(FrozenInstanceError):
  pp.script = "x"


def test_to_dict_roundtrip() -> None:
 pp = ProviderPayload(script="s", args={"k": "v"}, output="o", source_tier="t1")
 d = pp.to_dict()
 assert d["script"] == "s"
 assert d["args"] == {"k": "v"}
 assert d["output"] == "o"
 assert d["source_tier"] == "t1"


def test_default_values() -> None:
 pp = ProviderPayload()
 assert pp.script == ""
 assert pp.args == {}
 assert pp.output == ""
 assert pp.source_tier == "main"


def test_hashability_skipped_unhashable_dict_field() -> None:
 pp = ProviderPayload()
 assert pp.args == {}