* lib/rdoc/test_case.rb (setup): call `RDoc::Markup::PreProcess.reset`
at the end of `setup` method.
`RDoc::RDoc.new` requires `rdoc/generator/darkfish`
and requires `rdoc/tom_doc.rb` at last. It add post_proecssor
(at `add_post_processor`) and it fails
`TestRDocMarkupPreProcess#test_class_post_process`.
This issue occured only with sorted tests by alphabetical order.
`make test-all TESTS='rdoc/test_rdoc_markup_pre_process.rb --test-order=alpha`)
We can observe this failure with parallel test only a few times.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61521 b2dd03c8-39d4-4d8f-98ff-823fe69b080e