code: def test_pod_host_cast(host, expected_host):
      args = set_pod_parser().parse_args(["--host"] + host)
      assert args.host == expected_host
  
file_path: jina/tests/unit/parsers/peapods/runtimes/test_port_protocol_parser.py
imports: import pytest
  from jina.enums import ProtocolType
  from jina.helper import ArgNamespace
  from jina.parsers import set_gateway_parser, set_pod_parser
label_desc: Use image node_id 5 for calling a global function with example usage: test_pod_host_cast(host, expected_host) without return types