Add file test/ruby/enc/test_emoji_breaks.rb to test String#each_grapheme_cluster
test data provided by Unicode (at https://www.unicode.org/Public/emoji/#{EMOJI_VERSION}/).
Lines containing emoji for genies, zombies, and wrestling are ignored
because there seems to be a bug (#15343) in the implementation.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65990 b2dd03c8-39d4-4d8f-98ff-823fe69b080e