test_string.rb: remove duplicated code
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42778 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_string.rb: remove duplicated code
duplicated assertion.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42778 b2dd03c8-39d4-4d8f-98ff-823fe69b080e