def test_arc_grid_engine_surface_importable():
    from proteus.game.engine import Sprite, Level, Camera, ARCBaseGame, GameAction
    sprite = Sprite(pixels=[[1]], name="x", x=0, y=0)
    assert sprite.x == 0 and sprite.y == 0


def test_arc_grid_has_no_squid_game_imports():
    import pathlib
    # Anchor on this test file's location, not the cwd, so the invariant can
    # never pass vacuously (an empty rglob) when pytest runs from elsewhere.
    # The vendored ARC engine moved to proteus/game/engine in the game/web
    # restructure (was proteus/arc_grid).
    root = pathlib.Path(__file__).parent.parent / "proteus" / "game" / "engine"
    assert root.is_dir(), f"vendored engine not found at {root}"
    offenders = [
        p for p in root.rglob("*.py")
        if "squid_game" in p.read_text(encoding="utf-8")
    ]
    assert offenders == [], f"vendored engine must not import squid_game: {offenders}"