Create a simple user factory, and convert some basic tests.

test/factories/user.rb

@@ -0,0 +1,7 @@
+FactoryGirl.define do
+  factory :user do
+    sequence(:email) { |n| "user#{n}@example.com" }
+    sequence(:display_name) { |n| "User #{n}" }
+    pass_crypt Digest::MD5.hexdigest("test")
+  end
+end