Additional test coverage to DateTime comparison (sub millisecond).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44199 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Additional test coverage to Dir class. Dir['**/*'] should not resolve symlinks.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44200 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Additional test coverage to Enumerator#peek.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e