code: def test_pod_port_default():
      args = set_pod_parser().parse_args([])
      assert isinstance(args.port, list)
      assert len(args.port) == 1
  
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 4 for calling a global function with example usage: test_pod_port_default() without return types