Rails test: add application.css/js to precompile for Rails > 4

Author: glebm

test/dummy_rails/config/application.rb

@@ -22,6 +22,10 @@
 module Dummy
   class Application < Rails::Application
     config.assets.enabled = true if config.assets.respond_to?(:enabled)
+    if Rails::VERSION::MAJOR > 4
+      # Rails 4 precompiles application.css|js by default, but future version of Rails do not.
+      config.assets.precompile += %w( application.css application.js )
+    end
     config.to_prepare do
       if ENV['VERBOSE']
         STDERR.puts "Loaded Rails #{Rails::VERSION::STRING}, Sprockets #{Sprockets::VERSION}",