Gemfile in active_model_serializers-0.10.0.rc2 vs Gemfile in active_model_serializers-0.10.0.rc3

@@ -1,17 +1,48 @@
 source 'https://rubygems.org'
+#
+# Add a Gemfile.local to locally bundle gems outside of version control
+local_gemfile = File.join(File.expand_path('..', __FILE__), 'Gemfile.local')
+eval_gemfile local_gemfile if File.readable?(local_gemfile)
 
 # Specify your gem's dependencies in active_model_serializers.gemspec
 gemspec
 
-gem "minitest"
+version = ENV['RAILS_VERSION'] || '4.2'
 
-version = ENV["RAILS_VERSION"] || "4.2"
+if version == 'master'
+  gem 'rack', github: 'rack/rack'
+  git 'https://github.com/rails/rails.git' do
+    gem 'railties'
+    gem 'activesupport'
+    gem 'activemodel'
+    gem 'actionpack'
+    # Rails 5
+    gem 'actionview'
+  end
+  # Rails 5
+  gem 'rails-controller-testing', github: 'rails/rails-controller-testing'
+else
+  gem_version = "~> #{version}.0"
+  gem 'railties', gem_version
+  gem 'activesupport', gem_version
+  gem 'activemodel', gem_version
+  gem 'actionpack', gem_version
+end
 
-if version == "master"
-  gem "rails", github: "rails/rails"
+group :test do
+  gem 'activerecord'
+  gem 'sqlite3', platform: [:ruby, :mingw, :x64_mingw, :mswin]
+  gem 'activerecord-jdbcsqlite3-adapter', platform: :jruby
+  gem 'codeclimate-test-reporter', require: false
+end
 
-  # ugh https://github.com/rails/rails/issues/16063#issuecomment-48090125
-  gem "arel", github: "rails/arel"
-else
-  gem "rails", "~> #{version}.0"
+group :test, :development do
+  gem 'simplecov', '~> 0.10', require: false
+end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+
+group :development, :test do
+  gem 'rubocop', '~> 0.34.0', require: false
 end