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##
# String(utf8) Test
assert('String#[]') do
assert_equal "ち", "こんにちわ世界"[3]
assert_equal nil, "こんにちわ世界"[20]
assert_equal "世", "こんにちわ世界"[-2]
assert_equal "世界", "こんにちわ世界"[-2..-1]
assert_equal "んに", "こんにちわ世界"[1,2]
assert_equal "世", "こんにちわ世界"["世"]
end
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