import json
import os
import subprocess
import sys


def test_eval_vla_import_does_not_import_mujoco_early_when_headless_backend_not_set():
    env = os.environ.copy()
    env.pop('MUJOCO_GL', None)
    proc = subprocess.run(
        [
            sys.executable,
            '-c',
            (
                'import json, sys; '
                'from roboimi.demos.vla_scripts import eval_vla; '
                'print(json.dumps({"mujoco_in_sys_modules": "mujoco" in sys.modules}))'
            ),
        ],
        capture_output=True,
        text=True,
        env=env,
        check=True,
    )
    payload = json.loads(proc.stdout.strip())
    assert payload['mujoco_in_sys_modules'] is False