from __future__ import annotations

import pytest

pytest.importorskip("torch")

from gpu_batch01_v1_2_runner import DEFAULT_ATR_LIMITS, _atr_limits


def test_v1_2_uses_fixed_atr_defaults_covering_documented_drift():
    assert _atr_limits(None) == DEFAULT_ATR_LIMITS
    assert DEFAULT_ATR_LIMITS["max_absolute_error"] >= 1.4210854715202004e-14


@pytest.mark.parametrize("limits", [
    {"max_absolute_error": -1.0, "mae": 0.0},
    {"max_absolute_error": float("nan"), "mae": 0.0},
    {"max_absolute_error": 0.0},
])
def test_v1_2_rejects_invalid_atr_limits(limits):
    with pytest.raises(ValueError, match="finite, non-negative"):
        _atr_limits(limits)