* test/ruby/test_unicode_escape.rb (TestUnicodeEscape#test_basic): this
  assertion doesn't seems to be checking the unicode string on command
  line, but seems to be checking how to treat the unicode string from
  stdin.  so, should escape '\' before 'u'.  this fixes a test failure
  on Windows.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41797 b2dd03c8-39d4-4d8f-98ff-823fe69b080e