Fix snippet factory

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/factories.rb

@@ -5,10 +5,14 @@ FactoryGirl.define do
     Faker::Lorem.sentence
   end
 
-  sequence :name, aliases: [:file_name] do
+  sequence :name do
     Faker::Name.name
   end
 
+  sequence :file_name do
+    Faker::Internet.user_name
+  end
+
   sequence(:url) { Faker::Internet.uri('http') }
 
   factory :user, aliases: [:author, :assignee, :owner, :creator] do