Rakefile in active_model_serializers-0.10.0.rc3 vs Rakefile in active_model_serializers-0.10.0.rc4

@@ -9,23 +9,31 @@
   require 'rubocop'
   require 'rubocop/rake_task'
 rescue LoadError
 else
   Rake::Task[:rubocop].clear if Rake::Task.task_defined?(:rubocop)
-  if !defined?(::Rubinius)
-    Rake::Task[:rubocop].clear if Rake::Task.task_defined?(:rubocop)
-    desc 'Execute rubocop'
-    RuboCop::RakeTask.new(:rubocop) do |task|
-      task.options = ['--rails', '--display-cop-names', '--display-style-guide']
-      task.fail_on_error = true
+  require 'rbconfig'
+  # https://github.com/bundler/bundler/blob/1b3eb2465a/lib/bundler/constants.rb#L2
+  windows_platforms = /(msdos|mswin|djgpp|mingw)/
+  if RbConfig::CONFIG['host_os'] =~ windows_platforms
+    desc 'No-op rubocop on Windows-- unsupported platform'
+    task :rubocop do
+      puts 'Skipping rubocop on Windows'
     end
-  else
+  elsif defined?(::Rubinius)
     desc 'No-op rubocop to avoid rbx segfault'
     task :rubocop do
       puts 'Skipping rubocop on rbx due to segfault'
       puts 'https://github.com/rubinius/rubinius/issues/3499'
     end
+  else
+    Rake::Task[:rubocop].clear if Rake::Task.task_defined?(:rubocop)
+    desc 'Execute rubocop'
+    RuboCop::RakeTask.new(:rubocop) do |task|
+      task.options = ['--rails', '--display-cop-names', '--display-style-guide']
+      task.fail_on_error = true
+    end
   end
 end
 
 require 'rake/testtask'
 
@@ -34,6 +42,34 @@
   t.test_files = FileList['test/**/*_test.rb']
   t.ruby_opts = ['-r./test/test_helper.rb']
   t.verbose = true
 end
 
-task :default => :test
+desc 'Run isolated tests'
+task isolated: ['test:isolated:railtie']
+namespace :test do
+  namespace :isolated do
+    desc 'Run isolated tests for Railtie'
+    task :railtie do
+      dir = File.dirname(__FILE__)
+      file = "#{dir}/test/active_model_serializers/railtie_test_isolated.rb"
+
+      # https://github.com/rails/rails/blob/3d590add45/railties/lib/rails/generators/app_base.rb#L345-L363
+      _bundle_command = Gem.bin_path('bundler', 'bundle')
+      require 'bundler'
+      Bundler.with_clean_env do
+        command = "-w -I#{dir}/lib -I#{dir}/test #{file}"
+        full_command = %("#{Gem.ruby}" #{command})
+        system(full_command) or fail 'Failures' # rubocop:disable Style/AndOr
+      end
+    end
+  end
+end
+
+if ENV['RAILS_VERSION'].to_s > '4.0' && RUBY_ENGINE == 'ruby'
+  task default: [:isolated, :test, :rubocop]
+else
+  task default: [:test, :rubocop]
+end
+
+desc 'CI test task'
+task :ci => [:default]