Sprockets 4 test suite failures

[voxik]

Testing against Sprockets 4, there is test failure:

Error:
AssetsTest#test_coffee-script.js_is_included_in_Sprockets_environment:
Sprockets::Railtie::ManifestNeededError: Expected to find a manifest file in `app/assets/config/manifest.js`
But did not, please create this file and use it to link any assets that need
to be rendered by your app:
Example:
  //= link_tree ../images
  //= link_directory ../javascripts .js
  //= link_directory ../stylesheets .css
and restart your server
    
Error:
AssetsTest#test_coffee-script.js_is_included_in_Sprockets_environment:
Errno::ENOENT: No such file or directory @ apply2files - /home/travis/build/rails/coffee-rails/test/tmp/coffee-script.js
    
rails test test/assets_test.rb:25