add test for String#sum.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@6987 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2004-10-03 06:03:26 +00:00
parent 5973eda633
commit ba79ea56ad

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