Feature testing user specs

spec/factories/users.rb

@@ -1,8 +1,7 @@
 # Read about factories at https://github.com/thoughtbot/factory_girl
-
 FactoryGirl.define do
   factory :user do
-    email 'example@example.com'
+    sequence(:email) { |n| "example#{n}@example.com" }
     password 'changeme'
     password_confirmation 'changeme'
     confirmed_at Time.now