Fixed MailRoom specs and make sure it works with new resque.yml format

Some codestyle changes

lib/gitlab/mail_room.rb

@@ -14,6 +14,10 @@ module Gitlab
         @config ||= fetch_config
       end
+      def reload_config!
+        @config = fetch_config
+      end
+
       private
       def fetch_config

lib/gitlab/redis.rb

@@ -24,7 +24,7 @@ module Gitlab
       # @deprecated Use .params instead to get sentinel support
       def url
-        raw_config_hash[:url]
+        new.url
       end
       def with
@@ -45,6 +45,10 @@ module Gitlab
       redis_store_options
     end
+    def url
+      raw_config_hash[:url]
+    end
+
     private
     def redis_store_options

spec/config/mail_room_spec.rb

-require "spec_helper"
-describe "mail_room.yml" do
-  let(:config_path)   { "config/mail_room.yml" }
+require 'spec_helper'
+describe 'mail_room.yml' do
+  let(:config_path)   { 'config/mail_room.yml' }
   let(:configuration) { YAML.load(ERB.new(File.read(config_path)).result) }
-  context "when incoming email is disabled" do
+  context 'when incoming email is disabled' do
     before do
-      ENV["MAIL_ROOM_GITLAB_CONFIG_FILE"] = Rails.root.join("spec/fixtures/mail_room_disabled.yml").to_s
+      ENV['MAIL_ROOM_GITLAB_CONFIG_FILE'] = Rails.root.join('spec/fixtures/mail_room_disabled.yml').to_s
+      Gitlab::MailRoom.reload_config!
     end
     after do
-      ENV["MAIL_ROOM_GITLAB_CONFIG_FILE"] = nil
+      ENV['MAIL_ROOM_GITLAB_CONFIG_FILE'] = nil
     end
-    it "contains no configuration" do
+    it 'contains no configuration' do
       expect(configuration[:mailboxes]).to be_nil
     end
   end
-  context "when incoming email is enabled" do
+  context 'when incoming email is enabled' do
     before do
-      ENV["MAIL_ROOM_GITLAB_CONFIG_FILE"] = Rails.root.join("spec/fixtures/mail_room_enabled.yml").to_s
+      ENV['MAIL_ROOM_GITLAB_CONFIG_FILE'] = Rails.root.join('spec/fixtures/mail_room_enabled.yml').to_s
+      Gitlab::MailRoom.reload_config!
     end
     after do
-      ENV["MAIL_ROOM_GITLAB_CONFIG_FILE"] = nil
+      ENV['MAIL_ROOM_GITLAB_CONFIG_FILE'] = nil
     end
-    it "contains the intended configuration" do
+    it 'contains the intended configuration' do
       expect(configuration[:mailboxes].length).to eq(1)
       mailbox = configuration[:mailboxes].first
-      expect(mailbox[:host]).to eq("imap.gmail.com")
+      expect(mailbox[:host]).to eq('imap.gmail.com')
       expect(mailbox[:port]).to eq(993)
       expect(mailbox[:ssl]).to eq(true)
       expect(mailbox[:start_tls]).to eq(false)
-      expect(mailbox[:email]).to eq("gitlab-incoming@gmail.com")
-      expect(mailbox[:password]).to eq("[REDACTED]")
-      expect(mailbox[:name]).to eq("inbox")
-
-      redis_config_file = Rails.root.join('config', 'resque.yml')
-
-      redis_url =
-        if File.exist?(redis_config_file)
-          YAML.load_file(redis_config_file)[Rails.env]
-        else
-          "redis://localhost:6379"
-        end
+      expect(mailbox[:email]).to eq('gitlab-incoming@gmail.com')
+      expect(mailbox[:password]).to eq('[REDACTED]')
+      expect(mailbox[:name]).to eq('inbox')
+
+      redis_url = Gitlab::Redis.url
       expect(mailbox[:delivery_options][:redis_url]).to eq(redis_url)
       expect(mailbox[:arbitration_options][:redis_url]).to eq(redis_url)