fix reset order.

* 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

Author: ko1

lib/rdoc/test_case.rb

@@ -41,8 +41,6 @@ def setup
 
     @RM = RDoc::Markup
 
-    RDoc::Markup::PreProcess.reset
-
     @pwd = Dir.pwd
 
     @store = RDoc::Store.new
@@ -55,6 +53,8 @@ def setup
     def g.class_dir() end
     def g.file_dir() end
     @rdoc.generator = g
+
+    RDoc::Markup::PreProcess.reset
   end
 
   ##