[will_paginate] `rake test:plugins` will fail in some cases

While invoking `rails test:plugins` in the root of an application, will_paginate won't paginate but drop some fatal errors. I've found two causes for these errors:

1) If other plugins load the full Rails environment, `test/helper.rb` won't require `activerecord_test_connector` -- 'cause of the defined?(ActiveRecord) statement, and

2) when tests are invoked from outside (eg. from a rails app's root), the first three `require` will fail in `init.rb`. An absolute path may solve this error.

I've attached my solution. Please feel free... :)

ps: sry for my bad english, it's not my native language.