Test with asset pipeline

gistfile1.rb

### config/environments/test.rb

  ...

  # Add assets settings to be identical to production env
  # Using 
  if ENV['ASSETS']
    puts "ENV['ASSETS'] is given. Set asset pipeling configurations."
    # Compress JavaScripts and CSS
    config.assets.compress = true
    # Don't fallback to assets pipeline if a precompiled asset is missed
    config.assets.compile = false
    # Generate digests for assets URLs
    config.assets.digest = true
    config.assets.precompile += %w( participations.js participations.css )
  end
end

# Run test
# $ rake assets:clean
# $ rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile
# $ ASSETS=true rake spec
# ($ unset ASSETS)