@@ 103,9 103,9 @@ module Pushdown::SpecHelpers
 
 
 		### Specify that the operation that should cause the transition is the #on_event callback.
-		def on_an_event( event )
+		def on_an_event( event, *args )
 			raise ScriptError, "can't specify more than one callback" if self.callback
-			@callback = [ :on_event, event ]
+			@callback = [ :on_event, event, *args ]
 			return self
 		end
 		alias_method :on_event, :on_an_event

          

@@ 1,15 1,15 @@ 
 # -*- encoding: utf-8 -*-
-# stub: pushdown 0.3.0.pre.20210901151908 ruby lib
+# stub: pushdown 0.4.0.pre.20210902144834 ruby lib
 
 Gem::Specification.new do |s|
   s.name = "pushdown".freeze
-  s.version = "0.3.0.pre.20210901151908"
+  s.version = "0.4.0.pre.20210902144834"
 
   s.required_rubygems_version = Gem::Requirement.new("> 1.3.1".freeze) if s.respond_to? :required_rubygems_version=
   s.metadata = { "bug_tracker_uri" => "http://todo.sr.ht/~ged/Pushdown", "changelog_uri" => "http://deveiate.org/code/pushdown/History_md.html", "documentation_uri" => "http://deveiate.org/code/pushdown", "homepage_uri" => "http://hg.sr.ht/~ged/Pushdown", "source_uri" => "http://hg.sr.ht/~ged/Pushdown" } if s.respond_to? :metadata=
   s.require_paths = ["lib".freeze]
   s.authors = ["Michael Granger".freeze]
-  s.date = "2021-09-01"
+  s.date = "2021-09-02"
   s.description = "A pushdown automaton toolkit for Ruby. It's based on the State Manager from the Amethyst project.".freeze
   s.email = ["ged@faeriemud.org".freeze]
   s.files = ["History.md".freeze, "LICENSE.txt".freeze, "README.md".freeze, "lib/pushdown.rb".freeze, "lib/pushdown/automaton.rb".freeze, "lib/pushdown/exceptions.rb".freeze, "lib/pushdown/spec_helpers.rb".freeze, "lib/pushdown/state.rb".freeze, "lib/pushdown/transition.rb".freeze, "lib/pushdown/transition/pop.rb".freeze, "lib/pushdown/transition/push.rb".freeze, "lib/pushdown/transition/replace.rb".freeze, "lib/pushdown/transition/switch.rb".freeze, "spec/pushdown/automaton_spec.rb".freeze, "spec/pushdown/spec_helpers_spec.rb".freeze, "spec/pushdown/state_spec.rb".freeze, "spec/pushdown/transition/pop_spec.rb".freeze, "spec/pushdown/transition/push_spec.rb".freeze, "spec/pushdown/transition/replace_spec.rb".freeze, "spec/pushdown/transition/switch_spec.rb".freeze, "spec/pushdown/transition_spec.rb".freeze, "spec/pushdown_spec.rb".freeze, "spec/spec_helper.rb".freeze]

          

@@ 352,6 352,19 @@ RSpec.describe( Pushdown::SpecHelpers ) 
 		end
 
 
+		it "supports giving additional arguments to pass the #on_event operation" do
+			state_class.transition_push( :change, :other )
+
+			state = state_class.new
+			expect( state ).to receive( :on_event ).with( :foo, 1, "another arg" ).
+				and_return( :change )
+
+			expect {
+				expect( state ).to transition.on_an_event( :foo, 1, "another arg" )
+			}.to_not raise_error
+		end
+
+
 		it "adds the callback to the description if on_update is specified" do
 			state_class.transition_push( :change, :other )