import subprocess
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]


def test_c_decoder_matches_python(tmp_path):
    subprocess.run([sys.executable, str(ROOT / "tests" / "make_fixture.py")],
                   check=True)
    exe = tmp_path / "decode"
    subprocess.run([
        "gcc", "-std=c99", "-Wall", "-Werror",
        str(ROOT / "player" / "movie.c"),
        str(ROOT / "player" / "tests" / "test_movie_decode.c"),
        "-o", str(exe),
    ], check=True)
    out = subprocess.run(
        [str(exe), str(ROOT / "player" / "tests" / "fixture.bin")],
        check=True, capture_output=True, text=True).stdout
    assert "frames=2" in out
    assert "0 0 0 0 0 32 32" in out
    assert "1 1 1 1 1 2 3" in out