add failing test: "digested assets are removed from configured path"

Signed-off-by: José Valim <jose.valim@gmail.com>

railties/test/application/assets_test.rb

@@ -438,6 +438,19 @@ module ApplicationTests
       assert_equal 1, files.length, "Expected digested application.js asset to be generated, but none found"
     end
 
+    test "digested assets are removed from configured path" do
+      app_file "public/production_assets/application.js", "alert();"
+      add_to_env_config "production", "config.assets.prefix = 'production_assets'"
+
+      ENV["RAILS_ENV"] = nil
+      quietly do
+        Dir.chdir(app_path){ `bundle exec rake assets:clean` }
+      end
+
+      files = Dir["#{app_path}/public/production_assets/application.js"]
+      assert_equal 0, files.length, "Expected application.js asset to be removed, but still exists"
+    end
+
     private
 
     def app_with_assets_in_view