be sure to require_dependency on 'application', so that dependency loading is honored correctly

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4731 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/lib/test_help.rb

-require 'application'
+require_dependency 'application'
 
 # Make double-sure the RAILS_ENV is set to test, 
 # so fixtures are loaded to the right database