Aluode/PerceptionLabPortable

1"""2Pyodide and other single-threaded Python builds will be missing the3_multiprocessing module. Test that joblib still works in this environment.4"""5 6import os7import subprocess8import sys9 10 11def test_missing_multiprocessing(tmp_path):12    """13    Test that import joblib works even if _multiprocessing is missing.14 15    pytest has already imported everything from joblib. The most reasonable way16    to test importing joblib with modified environment is to invoke a separate17    Python process. This also ensures that we don't break other tests by18    importing a bad `_multiprocessing` module.19    """20    (tmp_path / "_multiprocessing.py").write_text(21        'raise ImportError("No _multiprocessing module!")'22    )23    env = dict(os.environ)24    # For subprocess, use current sys.path with our custom version of25    # multiprocessing inserted.26    env["PYTHONPATH"] = ":".join([str(tmp_path)] + sys.path)27    subprocess.check_call(28        [29            sys.executable,30            "-c",31            "import joblib, math; "32            "joblib.Parallel(n_jobs=1)("33            "joblib.delayed(math.sqrt)(i**2) for i in range(10))",34        ],35        env=env,36    )37