code: def test_parse_hostname(self):
      self.assertRaises(ValueError, parse_hostname, "testip")
      self.assertRaises(Exception, parse_hostname, "a@b:cc")
  
      self.assertRaises(IOError, parse_hostname, "a@b non-file")
      self.assertTupleEqual(("a", "b", 22, None), parse_hostname("a@b"))
  
imports: import unittest
  import mockssh
  import tempfile
  import pdb
  from shutil import copyfile
  from time import sleep
  from six import PY2
  import pkg_resources
  from aup.EE.Resource.SSHResourceManager import *
  from aup.EE.Job import Job
  from aup import BasicConfig
  from aup.Proposer import RandomProposer
  from aup.utils import get_default_connector
  from threading import Lock
label_desc: Use image node_id 1 for calling the AsyncSSHResourceManagerTestCase obj's underlying member method code with example usage: obj.test_parse_hostname() without return types