Add testcase for non english filename. Related to #2982.

actionpack/test/dispatch/static_test.rb

@@ -1,3 +1,4 @@
+# encoding: utf-8
 require 'abstract_unit'
 
 module StaticTests
@@ -30,6 +31,10 @@ module StaticTests
     assert_html "/foo/index.html", get("/foo")
   end
 
+  def test_served_static_file_with_non_english_filename
+    assert_html "means hello in Japanese\n", get("/foo/#{Rack::Utils.escape("こんにちは.html")}")
+  end
+
   private
 
     def assert_html(body, response)
@@ -53,4 +58,4 @@ class StaticTest < ActiveSupport::TestCase
   end
 
   include StaticTests
-end
+end

actionpack/test/fixtures/public/foo/こんにちは.html

@@ -0,0 +1 @@
+means hello in Japanese