diff --git a/railties/test/application/assets_test.rb b/railties/test/application/assets_test.rb
index 2dcb74bb9f3a94c3d1f7161b97f04a5fdbf2adfd..39da891661d7694b851ee3416c436e600ddcd56a 100644
--- a/railties/test/application/assets_test.rb
+++ b/railties/test/application/assets_test.rb
@@ -249,14 +249,14 @@ class User < ActiveRecord::Base; raise 'should not be reached'; end
     end
 
     test "the manifest file should be saved by default in the same assets folder" do
-      app_file "app/assets/javascripts/application.js", "alert();"
+      app_file "app/assets/stylesheets/test.css", "a{color: red}"
       add_to_config "config.assets.prefix = '/x'"
 
       precompile!
 
       manifest = Dir["#{app_path}/public/x/.sprockets-manifest-*.json"].first
       assets = ActiveSupport::JSON.decode(File.read(manifest))
-      assert_match(/application-([0-z]+)\.js/, assets["assets"]["application.js"])
+      assert_match(/test-([0-z]+)\.css/, assets["assets"]["test.css"])
     end
 
     test "assets do not require any assets group gem when manifest file is present" do