docstr: Test that lambda functionality stays the same.  The output produced
  currently is, I suspect invalid because of the unencoded brackets in the
  HTML, "<lambda>".
  
  The subtraction lambda method is tested.
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code: def test_lambda(self):
      """Test that lambda functionality stays the same.  The output produced
      currently is, I suspect invalid because of the unencoded brackets in the
      HTML, "<lambda>".
  
      The subtraction lambda method is tested.
      """
      self.client.request("GET", "/")
      response = self.client.getresponse()
  
      self.assertIn(
          (
              b'<dl><dt><a name="-&lt;lambda&gt;"><strong>'
              b"&lt;lambda&gt;</strong></a>(x, y)</dt></dl>"
          ),
          response.read(),
      )
  
imports: from xmlrpc.server import DocXMLRPCServer
  import http.client
  import re
  import sys
  import threading
  import unittest
  from test import support
label_desc: Use image node_id 6 for calling the DocXMLRPCHTTPGETServer obj's underlying member method code with example usage: obj.test_lambda() without return types