"""Golden tests for VOLATILITY_EXPANSION_BREAKOUT_V1 (governance/todo/technical_signals_p4_adoption_plan.yaml P4-3)."""
from __future__ import annotations

import importlib.util
from pathlib import Path

ROOT = Path(__file__).resolve().parents[3]
MODULE_PATH = ROOT / "tools" / "build_volatility_expansion_breakout_v1.py"


def _load_module():
    spec = importlib.util.spec_from_file_location("build_volatility_expansion_breakout_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_squeeze_then_strong_move_triggers_signal() -> None:
    mod = _load_module()
    prev_squeeze = mod.squeeze_detected(10)
    assert prev_squeeze is True
    assert mod.evaluate(prev_squeeze, 4.5) is True


def test_no_squeeze_does_not_trigger_even_with_strong_move() -> None:
    mod = _load_module()
    prev_squeeze = mod.squeeze_detected(80)
    assert prev_squeeze is False
    assert mod.evaluate(prev_squeeze, 4.5) is False


def test_missing_percentile_returns_null() -> None:
    mod = _load_module()
    assert mod.squeeze_detected(None) is None