Implement Action post-initialize hook

lib/producer/core/action.rb

@@ -13,6 +13,7 @@ module Producer
         @env        = env
         @arguments  = args
         @options    = options
+        setup if respond_to? :setup
       end
 
       def name

spec/producer/core/action_spec.rb

@@ -2,11 +2,22 @@ require 'spec_helper'
 
 module Producer::Core
   describe Action do
+    let(:env)         { double 'env'}
+    subject(:action)  { described_class.new(env) }
+
     it_behaves_like 'action'
 
-    describe '#name' do
+    describe '#initialize' do
-      subject(:action) { described_class.new(double 'env') }
+      it 'calls #setup when defined' do
+        action_class = Class.new(described_class)
+        action_class.class_eval do
+          define_method(:setup) { @arguments = :other_arguments }
+        end
+        expect(action_class.new(env).arguments).to eq :other_arguments
+      end
+    end
 
+    describe '#name' do
       it 'infers action name from class name' do
         expect(action.name).to eq 'action'
       end