Fix specs

spec/models/concerns/mentionable_spec.rb

@@ -3,6 +3,10 @@ require 'spec_helper'
 describe Mentionable do
   include Mentionable
+  def author
+    nil
+  end
+
   describe :references do
     let(:project) { create(:project) }

spec/services/notification_service_spec.rb

@@ -115,6 +115,7 @@ describe NotificationService, services: true do
       before do
         build_team(note.project)
+        note.project.team << [note.author, :master]
         ActionMailer::Base.deliveries.clear
       end