Add likeable alias in learning object

spec/factories/learning_objects.rb

 FactoryGirl.define do
-  factory :learning_object, aliases: [:complainable, :reviewable] do
+  factory :learning_object, aliases: [:complainable, :reviewable, :likeable] do
     sequence(:name) { |i| "LearningObject #{i}" }
     sequence(:id_dspace) { |i| i }
     publisher
@@ -9,7 +9,6 @@ FactoryGirl.define do
     language { Language.all.sample }
     author { Faker::Name.name }
     state LearningObject.states[:published]
-
     
     transient do
       tags_count 5