Rakefile in closure_tree-5.2.0 vs Rakefile in closure_tree-6.0.0.alpha

@@ -4,15 +4,10 @@
   puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
 end
 
 Bundler::GemHelper.install_tasks
 
-require 'yard'
-YARD::Rake::YardocTask.new do |t|
-  t.files = ['lib/**/*.rb', 'README.md']
-end
-
 require "rspec/core/rake_task"
 RSpec::Core::RakeTask.new(:spec) do |task|
   task.pattern = 'spec/*_spec.rb'
 end
 
@@ -24,13 +19,9 @@
     rake = 'bundle exec rake'
     fail unless system("#{rake} spec:generators")
     [['', ''], ['db_prefix_', ''], ['', '_db_suffix'], ['abc_', '_123']].each do |prefix, suffix|
       env = "DB_PREFIX=#{prefix} DB_SUFFIX=#{suffix}"
       fail unless system("#{rake} spec #{env}")
-    end
-    require 'active_record/version'
-    if ActiveRecord::VERSION::MAJOR == 3
-      fail unless system("#{rake} spec ATTR_ACCESSIBLE=1")
     end
   end
 
   desc 'Run generator specs'
   RSpec::Core::RakeTask.new(:generators) do |task|