Within the test environment, you can test event handling using a default handler that catches the event when it is triggered. A simulation of the ABAP SET HANDLER statement assigns handlers to triggering events.
You must have created an instance of the class that you want to test. For more information, see Creating Instances.
The icon changes to indicate that the handler is active.
If the method is called successfully, the chosen event is triggered and the result is displayed.
To switch off the handler for the chosen event, choose Utilities → Event handling → Switch off handler.