# tests/test_main.py
import sys
import pytest
from unittest.mock import patch
from ctf.main import main

def test_main_entry_point_help():
    """
    Verifies that calling main() executes the Click CLI app and responds
    to '--help' by listing registration groups.
    """
    # Mock sys.argv to simulate running 'ctf --help' from the shell
    with patch.object(sys, "argv", ["ctf", "--help"]):
        # Click calls sys.exit() after displaying help, raising SystemExit
        with pytest.raises(SystemExit) as exc_info:
            main()
        
        # Verify it exits with a successful exit code (0)
        assert exc_info.value.code == 0