Remove unneded model

test/helper.rb

@@ -49,6 +49,14 @@ class ActiveSupport::TestCase
   end
 end
 
+class Topic < ActiveRecord::Base
+  has_many :replies, dependent: :destroy, foreign_key: "parent_id"
+end
+
+class Reply < Topic
+  belongs_to :topic, :foreign_key => "parent_id", :counter_cache => true
+end
+
 class Comment < ActiveRecord::Base
   def self.lol
     "lol"

test/lifecycle_test.rb

@@ -1,7 +1,5 @@
 require 'helper'
 
-require 'models/topic'
-
 class SpecialDeveloper < Developer; end
 
 class DeveloperObserver < ActiveRecord::Observer