* lib/test/unit/assertions.rb (assert_raise_with_message): return
  raised exception same as assert_raise.

* test/ruby, test/-ext-: use assert_raise_with_message.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43212 b2dd03c8-39d4-4d8f-98ff-823fe69b080e