Hide Delegate.

hide-delegate/Rakefile

@@ -0,0 +1,5 @@
+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.pattern = 'test/*test.rb'
+end

hide-delegate/lib/after.rb

@@ -0,0 +1,32 @@
+class Client
+  attr_reader :clerk
+
+  def initialize clerk
+    @clerk = clerk
+  end
+end
+
+class Clerk
+  attr_reader :department
+
+  def initialize (department)
+    @department = department
+  end
+
+  def manager
+    department.manager
+  end
+end
+
+class Manager
+  attr_accessor :department
+end
+
+class Department
+  attr_reader :manager
+  def initialize manager
+    @manager = manager
+
+    manager.department = self
+  end
+end

hide-delegate/lib/before.rb

@@ -0,0 +1,33 @@
+class Client
+  attr_reader :department, :clerk
+
+  def initialize department, clerk
+    @department = department
+    @clerk = clerk
+  end
+end
+
+class Manager
+  attr_accessor :department
+end
+
+class Clerk
+  attr_reader :department
+
+  def initialize(department)
+    @department = department
+  end
+
+  def manager
+    department.manager
+  end
+end
+
+class Department
+  attr_reader :manager
+  def initialize manager
+    @manager = manager
+
+    manager.department = self
+  end
+end

hide-delegate/test/test.rb

@@ -0,0 +1,26 @@
+require 'minitest/spec'
+require 'minitest/autorun'
+
+require 'before' if ENV["BEFORE"]
+require 'after' unless ENV["BEFORE"]
+
+describe Client do
+  let(:manager)    { Manager.new             }
+  let(:department) { Department.new(manager) }
+  let(:clerk)      { Clerk.new(department)   }
+
+  if ENV["BEFORE"]
+    it "wants to know about the manager through a department" do
+      client     = Client.new(department, clerk)
+
+      client.department.manager.wont_be_nil
+    end
+
+  else
+    it "should rather be guided by a clerk to access that info" do
+      client     = Client.new(clerk)
+
+      client.clerk.manager.wont_be_nil
+    end
+  end
+end