Fix RoutingError when changing username to non ascii char.

features/steps/admin/admin_users.rb

@@ -8,4 +8,27 @@ class AdminUsers < Spinach::FeatureSteps
       page.should have_content user.name
     end
   end
+
+  And 'Click edit' do
+    @user = User.first
+    find("#edit_user_#{@user.id}").click
+  end
+
+  And 'Input non ascii char in username' do
+    fill_in 'user_username', with: "\u3042\u3044"
+  end
+
+  And 'Click save' do
+    click_button("Save")
+  end
+
+  Then 'See username error message' do
+    within "#error_explanation" do
+      page.should have_content "Username"
+    end
+  end
+
+  And 'Not chenged form action url' do
+    page.should have_selector %(form[action="/admin/users/#{@user.username}"])
+  end
 end