[ruby/rdoc] Undo accidentally deleted lines

https://github.com/ruby/rdoc/commit/4e14158255

test/rdoc/test_rdoc_parser.rb

@@ -147,6 +147,8 @@ class TestRDocParser < RDoc::TestCase
     end
 
     assert_equal RDoc::Parser::Simple, @RP.can_parse(readme_ext)
+  ensure
+    File.unlink readme_ext
   end
 
   def test_can_parse_modeline_c
@@ -163,7 +165,6 @@ class TestRDocParser < RDoc::TestCase
     File.unlink readme_inc
   end
 
-
   ##
   # Selenium hides a .jar file using a .txt extension.