findEvents
Filters the list of FeatureMessage for events of the specified type TEvent.
This method filters the invoking list to include only elements that are instances of the specified type TEvent, which must be a subclass of FeatureMessage. An assertion is performed to ensure that at least one event of the specified type is present. If no such event exists, an assertion error is thrown.
Return
A list of events of type TEvent extracted from the invoking list.