fix(xcvr): improve coverage

Signed-off-by: Wataru Ishida <[email protected]>

sonic-xcvrd/tests/test_xcvrd.py

@@ -237,6 +237,26 @@ def test_CmisManagerTask_task_run_with_exception(self):
         assert("sonic-xcvrd/xcvrd/xcvrd.py" in str(trace))
         assert("wait_for_port_config_done" in str(trace))
 
+        port_change_event = PortChangeEvent('Ethernet0', 1, 0, PortChangeEvent.PORT_ADD)
+        port_mapping.handle_port_change_event(port_change_event)
+        cmis_manager = CmisManagerTask(DEFAULT_NAMESPACE, port_mapping, stop_event)
+        cmis_manager.wait_for_port_config_done = MagicMock() #no-op
+        cmis_manager.update_port_transceiver_status_table_sw_cmis_state = MagicMock(side_effect = NotImplementedError)
+        exception_received = None
+        trace = None
+        try:
+            cmis_manager.start()
+            cmis_manager.join()
+        except Exception as e1:
+            exception_received = e1
+            trace = traceback.format_exc()
+
+        assert not cmis_manager.is_alive()
+        assert(type(exception_received) == NotImplementedError)
+        assert("NotImplementedError" in str(trace) and "effect" in str(trace))
+        assert("sonic-xcvrd/xcvrd/xcvrd.py" in str(trace))
+        assert("update_port_transceiver_status_table_sw_cmis_state" in str(trace))
+
     @patch('xcvrd.xcvrd.PortChangeObserver', MagicMock(handle_port_update_event=MagicMock()))
     @patch('xcvrd.xcvrd.CmisManagerTask.wait_for_port_config_done', MagicMock())
     @patch('xcvrd.xcvrd.is_fast_reboot_enabled', MagicMock(return_value=(False)))