"""
Brief: Tests for running foghorn.main as a script to cover __main__ guard.

Inputs:
  - None

Outputs:
  - None
"""

## def test_run_as_main_invokes_main_and_exits_zero(monkeypatch):
##     """
##     Brief: Executing module as __main__ raises SystemExit with code 0.

##     Inputs:
##       - monkeypatch: patch DNSServer and init_logging; mock open

##     Outputs:
##       - None: Asserts SystemExit(0)
##     """
##     yaml_data = (
##         "listen:\n  host: 127.0.0.1\n  port: 5354\n"
##         "upstream:\n  host: 1.1.1.1\n  port: 53\n"
##         "timeout_ms: 500\n"
##     )

##     class DummyServer:
##         def __init__(self, *a, **kw):
##             pass
##         def serve_forever(self):
##             raise KeyboardInterrupt

##     monkeypatch.setattr(main_mod, "DNSServer", DummyServer)
##     monkeypatch.setattr(main_mod, "init_logging", lambda cfg: None)

##     with patch("builtins.open", mock_open(read_data=yaml_data)):
##         # Provide argv so argparse doesn't choke
##         argv = sys.argv
##         sys.argv = ["foghorn", "--config", "x.yaml"]
##         try:
##             with pytest.raises(SystemExit) as ei:
##                 runpy.run_module("foghorn.main", run_name="__main__")
##         finally:
##             sys.argv = argv

##     assert isinstance(ei.value, SystemExit)
##     assert (ei.value.code or 0) == 0


## def test_main_returns_one_on_unhandled_exception(monkeypatch):
##     """
##     Brief: main() returns 1 on unhandled exceptions during server operation.

##     Inputs:
##       - monkeypatch: patch DNSServer.serve_forever to raise RuntimeError

##     Outputs:
##       - None: Asserts return code 1
##     """
##     yaml_data = (
##         "listen:\n  host: 127.0.0.1\n  port: 5354\n"
##         "upstream:\n  host: 1.1.1.1\n  port: 53\n"
##         "timeout_ms: 500\n"
##     )

##     class DummyServer:
##         def __init__(self, *a, **kw):
##             pass
##         def serve_forever(self):
##             raise RuntimeError("boom")

##     monkeypatch.setattr(main_mod, "DNSServer", DummyServer)
##     monkeypatch.setattr(main_mod, "init_logging", lambda cfg: None)

##     with patch("builtins.open", mock_open(read_data=yaml_data)):
##         # Call main() directly to hit exception handler and return 1
##         rc = main_mod.main(["--config", "x.yaml"])
##     assert rc == 1
