Add Gemfile dependencies to ActiveRecord and sqlite3.

Gemfile

@@ -25,5 +25,11 @@ else
   gem 'actionpack', gem_version
 end
 
+group :test do
+  gem 'activerecord'
+  gem 'sqlite3', platform: :ruby
+  gem 'activerecord-jdbcsqlite3-adapter', platform: :jruby
+end
+
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

test/fixtures/active_record.rb

@@ -37,7 +37,6 @@ module ARModels
 
   class PostSerializer < ActiveModel::Serializer
     attributes :id, :title, :body
-    params :title, :body
 
     has_many :comments
     belongs_to :author