Fix SettingHelper for hidden field

app/helpers/settings_helper.rb

@@ -12,7 +12,7 @@ module SettingsHelper
   def field_resolver(type, html, form, key, opts)
     case type
     when :hidden
-      return form.hidden_field(key)
+      html << form.hidden_field(key)
     when :boolean, :flag
       boolean_field(html, form, key, opts)
     when :choice

spec/features/fluentd/setting/out_forward_spec.rb

@@ -0,0 +1,40 @@
+require "spec_helper"
+
+describe "out_forward", stub: :daemon do
+  before { login_with exists_user }
+
+  let(:type) { "out_forward" }
+  let(:page_url) { send("daemon_setting_#{type}_path") }
+  let(:form_values) { {
+    Match: "*",
+    Name: "name",
+    Host: "host",
+    Port: "9999",
+    Path: "/dev/null",
+  } }
+
+  it "Updated config after submit" do
+    daemon.agent.config.should_not include("type file") # out_forward's Secondary hidden field
+    form_values.each_pair do |k,v|
+      daemon.agent.config.should_not include(v)
+    end
+    visit page_url
+    within("#new_fluentd_setting_#{type}") do
+      form_values.each_pair do |k,v|
+        fill_in k, with: v
+      end
+    end
+    click_button I18n.t("fluentd.common.finish")
+    form_values.each_pair do |k,v|
+      daemon.agent.config.should include(v)
+    end
+    daemon.agent.config.should include("type file") # out_forward's Secondary hidden field
+  end
+
+  it "Click to append Server fields", js: true do
+    visit page_url
+    all(".js-multiple").length.should == 1
+    first(".js-multiple .js-append").click
+    all(".js-multiple").length.should == 2
+  end
+end