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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
def test_getbyte
assert_equal(0x82, "\xE3\x81\x82\xE3\x81\x84".getbyte(2))
assert_equal(0x82, "\xE3\x81\x82\xE3\x81\x84".getbyte(-4))
assert_nil("\xE3\x81\x82\xE3\x81\x84".getbyte(100))
end
def test_setbyte
s = "\xE3\x81\x82\xE3\x81\x84"
s.setbyte(2, 0x84)
assert_equal("\xE3\x81\x84\xE3\x81\x84", s)
s = "\xE3\x81\x82\xE3\x81\x84"
assert_raise(IndexError) { s.setbyte(100, 0) }
s = "\xE3\x81\x82\xE3\x81\x84"
s.setbyte(-4, 0x84)
assert_equal("\xE3\x81\x84\xE3\x81\x84", s)
end
def test_ord
original_kcode = $KCODE
assert_raise(ArgumentError) { "".ord }
str_abc = "ABC"
str_a_i_U = "\xE3\x81\x82\xE3\x81\x84"
str_a_i_E = "\xA4\xA2\xA4\xA4"
str_a_i_S = "\x82\xA0\x82\xA2"
str_ai_U = "\xEF\xBD\xB1\xEF\xBD\xB2"
str_ai_E = "\x8E\xB1\x8E\xB2"
str_ai_S = "\xB1\xB2"
$KCODE = 'n'
assert_equal(0x41, str_abc.ord)
assert_equal(0xE3, str_a_i_U.ord)
assert_equal(0xA4, str_a_i_E.ord)
assert_equal(0x82, str_a_i_S.ord)
assert_equal(0xEF, str_ai_U.ord)
assert_equal(0x8E, str_ai_E.ord)
assert_equal(0xB1, str_ai_S.ord)
$KCODE = 'u'
assert_equal(0x41, str_abc.ord)
assert_equal(0x3042, str_a_i_U.ord)
assert_raise(ArgumentError) { str_a_i_U[0..0].ord }
assert_raise(ArgumentError) { str_a_i_U[0..1].ord }
assert_equal(0xFF71, str_ai_U.ord)
$KCODE = 's'
assert_equal(0x41, str_abc.ord)
assert_equal(0x82A0, str_a_i_S.ord)
assert_raise(ArgumentError) { str_a_i_S[0..0].ord }
assert_equal(0xB1, str_ai_S.ord)
$KCODE = 'e'
assert_equal(0x41, str_abc.ord)
assert_equal(0xA4A2, str_a_i_E.ord)
assert_raise(ArgumentError) { str_a_i_E[0..0].ord }
assert_equal(0x8EB1, str_ai_E.ord)
ensure
$KCODE = original_kcode
end
end
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