Function assert_output_event_count 

pub fn assert_output_event_count<P: PluginExport>(
    result: &DriverResult<P>,
    n: usize,
)

Assert exactly n output events were emitted by the plugin across the run. Requires .capture_output_events(true) on the driver.

Panics

Panics if result.output_events.len() != n.