drbtest.rb: refactor
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
drbtest.rb: refactor
refactor by splitting and using assert_raise.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e