Cleanup test exemplars and fix subsequent @#generate@ calls generating same values (#7613).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7458 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/exemplars/document_exemplar.rb

@@ -1,9 +1,4 @@
 class Document < ActiveRecord::Base
-  generator_for :title, :method => :next_title
+  generator_for :title, :start => 'Document001'
 
-  def self.next_title
-    @last_title ||= 'Document001'
-    @last_title.succ!
-    @last_title
-  end
 end