```
context 'with event_type is available create event' do
  let(:event_type) { EventType.where( name: 'visit_site').first }
  assert_difference 'Event.count' do
    Event.fire_event(event_type, @sponge,{})
  end
end

```

I searched Google for this error but found nothing to fix it.
Help me please. Thank you :)