pubtraitEvent: Send + Sync {fnevent_type(&self)->&str;fnget_data(&self)->&str;}#[cfg(test)]modtests{usesuper::*;#[test]fntest_event_trait(){// This is a placeholder test to ensure the Event trait is defined.
// Since the Event trait is a marker trait, we can't directly test its methods.
// However, we can test that a struct implementing the trait compiles correctly.
structTestEvent;implEvent forTestEvent{fnevent_type(&self)->&str{"test_event"}fnget_data(&self)->&str{"test_data"}}let event = TestEvent;assert_eq!(event.event_type(),"test_event");assert_eq!(event.get_data(),"test_data");}}