Refactor respond_to_event.
Refactor respond_to_event.

state-machines/state_machines-rspec,vanburg/state_machines_activerecord_rspec,chrise86/state_machines_activerecord_rspec,chrise86/state_machines_activerecord_rspec,modocache/state_machine_rspec,vanburg/state_machines_activerecord_rspec