raise rather than fail

lib/simplekit.rb

@@ -54,7 +54,7 @@ module SimpleKit
     #   - +args+ -> an optional list of arguments to pass to the event
     #     at invocation time.
     def schedule(event, delay, *args)
-      fail 'Model scheduled event with negative delay.' if delay < 0
+      raise 'Model scheduled event with negative delay.' if delay < 0
       @event_list.push EventNotice.new(event, @model_time + delay, args)
     end