code: def _get_cmd(self, metadata=None):
      if metadata is None:
          metadata = {
              "url": "xxx",
              "author": "xxx",
              "author_email": "xxx",
              "name": "xxx",
              "version": "xxx",
          }
      pkg_info, dist = self.create_dist(**metadata)
      return register(dist)
  
imports: import os
  import unittest
  import getpass
  import urllib2
  import warnings
  from test.test_support import check_warnings, run_unittest
  from distutils.command import register
  from distutils.command.register import register
  from distutils.errors import DistutilsSetupError
  from distutils.tests.test_config import PyPIRCCommandTestCase
label_desc: Use image node_id 3 for calling the RegisterTestCase obj's underlying member method code with example usage: obj._get_cmd(metadata) and returns: register