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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
assert('String#reverse', '15.2.10.5.29') do
a = 'こんにちわ世界!'
a.reverse
assert_equal 'こんにちわ世界!', a
assert_equal '!界世わちにんこ', 'こんにちわ世界!'.reverse
end
assert('String#reverse!', '15.2.10.5.30') do
a = 'こんにちわ世界!'
a.reverse!
assert_equal '!界世わちにんこ', a
assert_equal '!界世わちにんこ', 'こんにちわ世界!'.reverse!
end
assert('Invalid sequence') do
assert_equal 5, "\xF8\x88\x80\x80\x80".size
assert_equal 6, "\xFC\x84\x80\x80\x80\x80".size
end
assert('String#size') do
str = 'こんにちわ世界!'
assert_equal 8, str.size
assert_not_equal str.bytesize, str.size
assert_equal 2, str[1, 2].size
end
assert('String#index') do
str = "こんにちわ世界!\nこんにちわ世界!"
assert_nil str.index('さ')
assert_equal 3, str.index('ち')
assert_equal 12, str.index('ち', 10)
assert_equal nil, str.index("さ")
end
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