1 files changed, 16 insertions, 0 deletions
diff --git a/actionpack/test/controller/routing_test.rb b/actionpack/test/controller/routing_test.rb
index fefb84e095..f09051b306 100644
--- a/actionpack/test/controller/routing_test.rb
+++ b/actionpack/test/controller/routing_test.rb
@@ -96,6 +96,22 @@ class LegacyRouteSetTests < ActiveSupport::TestCase
     assert_equal({ "artist" => "journey", "song" => "faithfully" }, hash)
   end
 
+  def test_id_encoding
+    rs.draw do
+      get "/journey/:id", to: lambda { |env|
+        param = ActionDispatch::Request.new(env).path_parameters
+        resp = ActiveSupport::JSON.encode param
+        [200, {}, [resp]]
+      }
+    end
+
+    # The encoding of the URL in production is *binary*, so we add a
+    # .b here.
+    hash = ActiveSupport::JSON.decode get(URI("http://example.org/journey/%E5%A4%AA%E9%83%8E".b))
+    assert_equal({ "id" => "太郎" }, hash)
+    assert_equal ::Encoding::UTF_8, hash["id"].encoding
+  end
+
   def test_id_with_dash
     rs.draw do
       get "/journey/:id", to: lambda { |env|