"""Golden tests for CONSECUTIVE_STREAK_V1 (governance/todo/technical_signals_p4_adoption_plan.yaml P4-5)."""
from __future__ import annotations

import importlib.util
from pathlib import Path

ROOT = Path(__file__).resolve().parents[3]
MODULE_PATH = ROOT / "tools" / "build_consecutive_streak_v1.py"


def _load_module():
    spec = importlib.util.spec_from_file_location("build_consecutive_streak_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_trailing_three_up_days_gives_up_streak_3() -> None:
    mod = _load_module()
    result = mod.compute_streaks([1, 2, -1, 1, 2, 3])
    assert result["up_streak"] == 3
    assert result["down_streak"] == 0


def test_trailing_two_down_days_gives_down_streak_2() -> None:
    mod = _load_module()
    result = mod.compute_streaks([5, -1, -2])
    assert result["down_streak"] == 2
    assert result["up_streak"] == 0


def test_empty_changes_returns_null_not_zero() -> None:
    mod = _load_module()
    result = mod.compute_streaks([])
    assert result["up_streak"] is None
    assert result["down_streak"] is None