To trigger an event for GUA you need to map some Data Sources to Event Category and Event Action. These are the two parameters that are required by Google to log a Custom Event.
For Example, with the above track call you could map:
test_id -> Event Category
selected_title -> Event Action
You could also map name_test_santander to Event Label; however, event label is not one of the required parameters for Google Custom Event Tracking.
Without the above mappings for Category and Action, the GUA tag template will not trigger a custom event because it would be discarded by GA anyway.