code: def test_handle_message_ready_reply_with_comm_id(self):
      def assert_ready(msg=None, metadata=None):
          self.assertEqual(
              metadata,
              {
                  "msg_type": "Ready",
                  "content": "",
                  "comm_id": "Testing id",
              },
          )
  
      comm = Comm(id="Test")
      comm.send = assert_ready
      comm._handle_msg({"comm_id": "Testing id"})
  
file_path: holoviews/holoviews/tests/plotting/test_comms.py
imports: from pyviz_comms import Comm, JupyterComm
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 6 for calling the TestComm obj's underlying member method code with example usage: obj.test_handle_message_ready_reply_with_comm_id() without return types