"""Golden tests for GOLDEN_CROSS_SIGNAL_V1 (governance/todo/technical_signals_p4_adoption_plan.yaml P4-1)."""
from __future__ import annotations

import importlib.util
from pathlib import Path

ROOT = Path(__file__).resolve().parents[3]
MODULE_PATH = ROOT / "tools" / "build_golden_cross_signal_v1.py"


def _load_module():
    spec = importlib.util.spec_from_file_location("build_golden_cross_signal_v1", MODULE_PATH)
    module = importlib.util.module_from_spec(spec)
    assert spec.loader is not None
    spec.loader.exec_module(module)
    return module


def test_ma20_crossing_above_ma60_detected() -> None:
    mod = _load_module()
    assert mod.golden_cross_today(105, 98, 100, 99) is True


def test_no_cross_when_ma20_already_above() -> None:
    mod = _load_module()
    assert mod.golden_cross_today(105, 101, 100, 99) is False


def test_missing_prev_values_returns_null_not_false() -> None:
    mod = _load_module()
    assert mod.golden_cross_today(105, None, 100, 99) is None