test_refinement.rb: test for r59946
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60082 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_refinement.rb: test for r59946
r59946, interning dynamic symbol should not be affected by
refinements too.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60082 b2dd03c8-39d4-4d8f-98ff-823fe69b080e