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require 'test/unit'
class TestString < Test::Unit::TestCase
def check_sum(str, bits=16)
sum = 0
str.each_byte {|c| sum += c}
sum = sum & ((1 << bits) - 1) if bits != 0
assert_equal(sum, str.sum(bits))
end
def test_sum
assert_equal(0, "".sum)
assert_equal(294, "abc".sum)
check_sum("abc")
check_sum("\x80")
0.upto(70) {|bits|
check_sum("xyz", bits)
}
end
def test_succ
assert_equal("abd", "abc".succ)
assert_equal("z", "y".succ)
assert_equal("aaa", "zz".succ)
assert_equal("124", "123".succ)
assert_equal("1000", "999".succ)
assert_equal("2.000", "1.999".succ)
assert_equal("2000aaa", "1999zzz".succ)
assert_equal("AAAAA000", "ZZZZ999".succ)
assert_equal("*+", "**".succ)
assert_equal("abce", "abcd".succ)
assert_equal("THX1139", "THX1138".succ)
assert_equal("<<koalb>>", "<<koala>>".succ)
assert_equal("2000aaa", "1999zzz".succ)
assert_equal("AAAA0000", "ZZZ9999".succ)
assert_equal("**+", "***".succ)
end
def test_succ!
a = "abc"
b = a.dup
assert_equal("abd", a.succ!)
assert_equal("abd", a)
assert_equal("abc", b)
a = "y"
assert_equal("z", a.succ!)
assert_equal("z", a)
a = "zz"
assert_equal("aaa", a.succ!)
assert_equal("aaa", a)
a = "123"
assert_equal("124", a.succ!)
assert_equal("124", a)
a = "999"
assert_equal("1000", a.succ!)
assert_equal("1000", a)
a = "1999zzz"
assert_equal("2000aaa", a.succ!)
assert_equal("2000aaa", a)
a = "ZZZZ999"
assert_equal("AAAAA000", a.succ!)
assert_equal("AAAAA000", a)
a = "**"
assert_equal("*+", a.succ!)
assert_equal("*+", a)
assert_equal("aaaaaaaaaaaa", "zzzzzzzzzzz".succ!)
assert_equal("aaaaaaaaaaaaaaaaaaaaaaaa", "zzzzzzzzzzzzzzzzzzzzzzz".succ!)
end
end
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