classes from rdoc. Since lib/test is only present as a compatibility
  layer with the legacy test suite many test/unit users will be using
  minitest or the test/unit gem instead. It is recommended to use one
  of these alternatives for writing new tests.

  This patch was based on a patch submitted by Steve Klabnik.
  [ruby-core:56694] [Bug #8778]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e