def test_very_long_cmdline_arg(pytester: Pytester) -> None:
    """
    Regression test for #11394.

    Note: we could not manage to actually reproduce the error with this code, we suspect
    GitHub runners are configured to support very long paths, however decided to leave
    the test in place in case this ever regresses in the future.
    """
    pytester.makeconftest(
        """
        import pytest

        def pytest_addoption(parser):
            parser.addoption("--long-list", dest="long_list", action="store", default="all", help="List of things")

        @pytest.fixture(scope="module")
        def specified_feeds(request):
            list_string = request.config.getoption("--long-list")
            return list_string.split(',')
        """
    )
    pytester.makepyfile(
        """
        def test_foo(specified_feeds):
            assert len(specified_feeds) == 100_000
        """
    )
    result = pytester.runpytest("--long-list", ",".join(["helloworld"] * 100_000))
    result.stdout.fnmatch_lines("* 1 passed *")

    Regression test for #11394.

    Note: we could not manage to actually reproduce the error with this code, we suspect
    GitHub runners are configured to support very long paths, however decided to leave
    the test in place in case this ever regresses in the future.
    
testing/test_main.py