import pytest
from pydantic import ValidationError

from app.models.policy.output_schema import DecisionSchema


def test_policy_schema_forbids_unknown_keys() -> None:
    payload = {
        "mode": "REGIMEN_OPT",
        "action_type": "KEEP_REGIMEN",
        "target_drug": None,
        "replacement_drug": None,
        "dose_bucket": "NA",
        "taper_days": None,
        "monitoring_plan": None,
        "candidate_id": "cand_01",
        "confidence": 0.8,
        "unexpected": "x",
    }
    with pytest.raises(ValidationError):
        DecisionSchema.model_validate(payload)