test: increased cb test coverage

test/unit/agents/communication/test_ri_communication_agent.py

@@ -334,3 +334,13 @@ async def test_listen_loop_ping_sends_internal(zmq_context):
     await agent._listen_loop()
 
     pub_socket.send_multipart.assert_awaited()
+
+
+@pytest.mark.asyncio
+async def test_negotiate_req_socket_none_causes_retry(zmq_context):
+    agent = RICommunicationAgent("ri_comm")
+    agent._req_socket = None
+
+    result = await agent._negotiate_connection(max_retries=1)
+
+    assert result is False