require "test/unit" require "bigdecimal" class TestBigDecimal < Test::Unit::TestCase def setup BigDecimal.mode(BigDecimal::EXCEPTION_ALL, true) BigDecimal.mode(BigDecimal::EXCEPTION_UNDERFLOW, true) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, true) BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_HALF_UP) BigDecimal.limit(0) end def test_version assert_equal("1.0.1", BigDecimal.ver) end def test_global_new assert_equal(1, BigDecimal("1")) assert_equal(1, BigDecimal("1", 1)) assert_raise(ArgumentError) { BigDecimal("1", -1) } end def test_new assert_equal(1, BigDecimal.new("1")) assert_equal(1, BigDecimal.new("1", 1)) assert_equal(1, BigDecimal.new(" 1 ")) assert_equal(111, BigDecimal.new("1_1_1_")) assert_equal(0, BigDecimal.new("_1_1_1")) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) assert_equal( 1, BigDecimal.new("Infinity").infinite?) assert_equal(-1, BigDecimal.new("-Infinity").infinite?) assert_equal(true, BigDecimal.new("NaN").nan?) end def _test_mode(type) BigDecimal.mode(type, true) assert_raise(FloatDomainError) { yield } BigDecimal.mode(type, false) assert_nothing_raised { yield } end def test_mode assert_raise(TypeError) { BigDecimal.mode(BigDecimal::EXCEPTION_ALL, 1) } assert_raise(TypeError) { BigDecimal.mode(BigDecimal::ROUND_MODE, 256) } assert_raise(TypeError) { BigDecimal.mode(0xf000, true) } end def test_exception_nan _test_mode(BigDecimal::EXCEPTION_NaN) { BigDecimal.new("NaN") } end def test_exception_infinity _test_mode(BigDecimal::EXCEPTION_INFINITY) { BigDecimal.new("Infinity") } end def test_exception_underflow _test_mode(BigDecimal::EXCEPTION_UNDERFLOW) do x = BigDecimal.new("0.1") 100.times do x *= x break if x == false end end end def test_exception_overflow _test_mode(BigDecimal::EXCEPTION_OVERFLOW) do x = BigDecimal.new("10") 100.times do x *= x break if x == false end end end def test_exception_zerodivide _test_mode(BigDecimal::EXCEPTION_ZERODIVIDE) { 1 / BigDecimal.new("0") } _test_mode(BigDecimal::EXCEPTION_ZERODIVIDE) { -1 / BigDecimal.new("0") } end def test_round_up n4 = BigDecimal.new("4") # n4 / 9 = 0.44444... n5 = BigDecimal.new("5") # n5 / 9 = 0.55555... n6 = BigDecimal.new("6") # n6 / 9 = 0.66666... m4, m5, m6 = -n4, -n5, -n6 n2h = BigDecimal.new("2.5") n3h = BigDecimal.new("3.5") m2h, m3h = -n2h, -n3h BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_UP) assert_operator(n4, :<, n4 / 9 * 9) assert_operator(n5, :<, n5 / 9 * 9) assert_operator(n6, :<, n6 / 9 * 9) assert_operator(m4, :>, m4 / 9 * 9) assert_operator(m5, :>, m5 / 9 * 9) assert_operator(m6, :>, m6 / 9 * 9) assert_equal(3, n2h.round) assert_equal(4, n3h.round) assert_equal(-3, m2h.round) assert_equal(-4, m3h.round) BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_DOWN) assert_operator(n4, :>, n4 / 9 * 9) assert_operator(n5, :>, n5 / 9 * 9) assert_operator(n6, :>, n6 / 9 * 9) assert_operator(m4, :<, m4 / 9 * 9) assert_operator(m5, :<, m5 / 9 * 9) assert_operator(m6, :<, m6 / 9 * 9) assert_equal(2, n2h.round) assert_equal(3, n3h.round) assert_equal(-2, m2h.round) assert_equal(-3, m3h.round) BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_HALF_UP) assert_operator(n4, :>, n4 / 9 * 9) assert_operator(n5, :<, n5 / 9 * 9) assert_operator(n6, :<, n6 / 9 * 9) assert_operator(m4, :<, m4 / 9 * 9) assert_operator(m5, :>, m5 / 9 * 9) assert_operator(m6, :>, m6 / 9 * 9) assert_equal(3, n2h.round) assert_equal(4, n3h.round) assert_equal(-3, m2h.round) assert_equal(-4, m3h.round) BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_HALF_DOWN) assert_operator(n4, :>, n4 / 9 * 9) assert_operator(n5, :>, n5 / 9 * 9) assert_operator(n6, :<, n6 / 9 * 9) assert_operator(m4, :<, m4 / 9 * 9) assert_operator(m5, :<, m5 / 9 * 9) assert_operator(m6, :>, m6 / 9 * 9) assert_equal(2, n2h.round) assert_equal(3, n3h.round) assert_equal(-2, m2h.round) assert_equal(-3, m3h.round) BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_HALF_EVEN) assert_operator(n4, :>, n4 / 9 * 9) assert_operator(n5, :<, n5 / 9 * 9) assert_operator(n6, :<, n6 / 9 * 9) assert_operator(m4, :<, m4 / 9 * 9) assert_operator(m5, :>, m5 / 9 * 9) assert_operator(m6, :>, m6 / 9 * 9) assert_equal(2, n2h.round) assert_equal(4, n3h.round) assert_equal(-2, m2h.round) assert_equal(-4, m3h.round) BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_CEILING) assert_operator(n4, :<, n4 / 9 * 9) assert_operator(n5, :<, n5 / 9 * 9) assert_operator(n6, :<, n6 / 9 * 9) assert_operator(m4, :<, m4 / 9 * 9) assert_operator(m5, :<, m5 / 9 * 9) assert_operator(m6, :<, m6 / 9 * 9) assert_equal(3, n2h.round) assert_equal(4, n3h.round) assert_equal(-2, m2h.round) assert_equal(-3, m3h.round) BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_FLOOR) assert_operator(n4, :>, n4 / 9 * 9) assert_operator(n5, :>, n5 / 9 * 9) assert_operator(n6, :>, n6 / 9 * 9) assert_operator(m4, :>, m4 / 9 * 9) assert_operator(m5, :>, m5 / 9 * 9) assert_operator(m6, :>, m6 / 9 * 9) assert_equal(2, n2h.round) assert_equal(3, n3h.round) assert_equal(-3, m2h.round) assert_equal(-4, m3h.round) end def test_zero_p assert_equal(true, BigDecimal.new("0").zero?) assert_equal(false, BigDecimal.new("1").zero?) end def test_nonzero_p assert_equal(nil, BigDecimal.new("0").nonzero?) assert_equal(BigDecimal.new("1"), BigDecimal.new("1").nonzero?) end def test_double_fig assert_kind_of(Integer, BigDecimal.double_fig) end def test_cmp n1 = BigDecimal.new("1") n2 = BigDecimal.new("2") assert_equal( 0, n1 <=> n1) assert_equal( 1, n2 <=> n1) assert_equal(-1, n1 <=> n2) assert_operator(n1, :==, n1) assert_operator(n1, :!=, n2) assert_operator(n1, :<, n2) assert_operator(n1, :<=, n1) assert_operator(n1, :<=, n2) assert_operator(n2, :>, n1) assert_operator(n2, :>=, n1) assert_operator(n1, :>=, n1) assert_operator(BigDecimal.new("-0"), :==, BigDecimal.new("0")) assert_operator(BigDecimal.new("0"), :<, BigDecimal.new("1")) assert_operator(BigDecimal.new("1"), :>, BigDecimal.new("0")) assert_operator(BigDecimal.new("1"), :>, BigDecimal.new("-1")) assert_operator(BigDecimal.new("-1"), :<, BigDecimal.new("1")) assert_operator(BigDecimal.new((2**100).to_s), :>, BigDecimal.new("1")) assert_operator(BigDecimal.new("1"), :<, BigDecimal.new((2**100).to_s)) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) inf = BigDecimal.new("Infinity") assert_operator(inf, :>, 1) assert_operator(1, :<, inf) end def test_cmp_corece n1 = BigDecimal.new("1") n2 = BigDecimal.new("2") o1 = Object.new; def o1.coerce(x); [x, BigDecimal.new("1")]; end o2 = Object.new; def o2.coerce(x); [x, BigDecimal.new("2")]; end assert_equal( 0, n1 <=> o1) assert_equal( 1, n2 <=> o1) assert_equal(-1, n1 <=> o2) assert_operator(n1, :==, o1) assert_operator(n1, :!=, o2) assert_operator(n1, :<, o2) assert_operator(n1, :<=, o1) assert_operator(n1, :<=, o2) assert_operator(n2, :>, o1) assert_operator(n2, :>=, o1) assert_operator(n1, :>=, 1) end def test_cmp_bignum assert_operator(BigDecimal.new((2**100).to_s), :==, 2**100) end def test_cmp_data d = Time.now; def d.coerce(x); [x, x]; end assert_operator(BigDecimal.new((2**100).to_s), :==, d) end def test_precs a = BigDecimal.new("1").precs assert_instance_of(Array, a) assert_equal(2, a.size) assert_kind_of(Integer, a[0]) assert_kind_of(Integer, a[1]) end def test_hash a = [] x = BigDecimal.new("1") 10.times { a << x *= 10 } h = {} a.each_with_index {|x, i| h[x] = i } a.each_with_index do |x, i| assert_equal(i, h[x]) end end def test_marshal s = Marshal.dump(BigDecimal("1", 1)) assert_equal(BigDecimal("1", 1), Marshal.load(s)) # corrupt data s = s.gsub(/BigDecimal.*\z/m) {|x| x.gsub(/\d/m, "-") } assert_raise(TypeError) { Marshal.load(s) } end def test_finite_infinite_nan BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) x = BigDecimal.new("0") assert_equal(true, x.finite?) assert_equal(nil, x.infinite?) assert_equal(false, x.nan?) y = 1 / x assert_equal(false, y.finite?) assert_equal(1, y.infinite?) assert_equal(false, y.nan?) y = -1 / x assert_equal(false, y.finite?) assert_equal(-1, y.infinite?) assert_equal(false, y.nan?) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) y = 0 / x assert_equal(false, y.finite?) assert_equal(nil, y.infinite?) assert_equal(true, y.nan?) end def test_to_i BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) x = BigDecimal.new("0") assert_kind_of(Integer, x.to_i) assert_equal(0, x.to_i) assert_nil(( 1 / x).to_i) assert_nil((-1 / x).to_i) assert_nil(( 0 / x).to_i) x = BigDecimal.new("1") assert_equal(1, x.to_i) x = BigDecimal.new((2**100).to_s) assert_equal(2**100, x.to_i) end def test_to_f BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) x = BigDecimal.new("0") assert_instance_of(Float, x.to_f) assert_equal(0.0, x.to_f) assert_equal( 1.0 / 0.0, ( 1 / x).to_f) assert_equal(-1.0 / 0.0, (-1 / x).to_f) assert_equal(true, ( 0 / x).to_f.nan?) x = BigDecimal.new("1") assert_equal(1.0, x.to_f) x = BigDecimal.new((2**100).to_s) assert_equal((2**100).to_f, x.to_f) x = BigDecimal.new("1" + "0" * 10000) assert_equal(0, BigDecimal.new("-0").to_f) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, true) assert_raise(FloatDomainError) { x.to_f } BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) assert_kind_of(Float, x .to_f) assert_kind_of(Float, (-x).to_f) end def test_coerce a, b = BigDecimal.new("1").coerce(1.0) assert_instance_of(Float, a) assert_instance_of(Float, b) end def test_uplus x = BigDecimal.new("1") assert_equal(x, x.send(:+@)) end def test_add x = BigDecimal.new("1") assert_equal(BigDecimal.new("2"), x + x) assert_equal(1, BigDecimal.new("0") + 1) assert_equal(1, x + 0) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("0") + 0).sign) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("-0") + 0).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_ZERO, (BigDecimal.new("-0") + BigDecimal.new("-0")).sign) x = BigDecimal.new((2**100).to_s) assert_equal(BigDecimal.new((2**100+1).to_s), x + 1) end def test_sub x = BigDecimal.new("1") assert_equal(BigDecimal.new("0"), x - x) assert_equal(-1, BigDecimal.new("0") - 1) assert_equal(1, x - 0) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("0") - 0).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_ZERO, (BigDecimal.new("-0") - 0).sign) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("-0") - BigDecimal.new("-0")).sign) x = BigDecimal.new((2**100).to_s) assert_equal(BigDecimal.new((2**100-1).to_s), x - 1) end def test_mult x = BigDecimal.new((2**100).to_s) assert_equal(BigDecimal.new((2**100 * 3).to_s), (x * 3).to_i) assert_equal(x, (x * 1).to_i) assert_equal(x, (BigDecimal("1") * x).to_i) assert_equal(BigDecimal.new((2**200).to_s), (x * x).to_i) end def test_div x = BigDecimal.new((2**100).to_s) assert_equal(BigDecimal.new((2**100 / 3).to_s), (x / 3).to_i) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("0") / 1).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_ZERO, (BigDecimal.new("-0") / 1).sign) assert_equal(2, BigDecimal.new("2") / 1) assert_equal(-2, BigDecimal.new("2") / -1) end def test_mod x = BigDecimal.new((2**100).to_s) assert_equal(1, x % 3) assert_equal(2, (-x) % 3) assert_equal(-2, x % -3) assert_equal(-1, (-x) % -3) end def test_remainder x = BigDecimal.new((2**100).to_s) assert_equal(1, x.remainder(3)) assert_equal(-1, (-x).remainder(3)) assert_equal(1, x.remainder(-3)) assert_equal(-1, (-x).remainder(-3)) end def test_divmod x = BigDecimal.new((2**100).to_s) assert_equal([(x / 3).floor, 1], x.divmod(3)) assert_equal([(-x / 3).floor, 2], (-x).divmod(3)) assert_equal([0, 0], BigDecimal.new("0").divmod(2)) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) a, b = BigDecimal.new("0").divmod(0) assert_equal(true, a.nan?) assert_equal(true, b.nan?) end def test_add_bigdecimal x = BigDecimal.new((2**100).to_s) assert_equal(3000000000000000000000000000000, x.add(x, 1)) assert_equal(2500000000000000000000000000000, x.add(x, 2)) assert_equal(2540000000000000000000000000000, x.add(x, 3)) end def test_sub_bigdecimal x = BigDecimal.new((2**100).to_s) assert_equal(1000000000000000000000000000000, x.sub(1, 1)) assert_equal(1300000000000000000000000000000, x.sub(1, 2)) assert_equal(1270000000000000000000000000000, x.sub(1, 3)) end def test_mult_bigdecimal x = BigDecimal.new((2**100).to_s) assert_equal(4000000000000000000000000000000, x.mult(3, 1)) assert_equal(3800000000000000000000000000000, x.mult(3, 2)) assert_equal(3800000000000000000000000000000, x.mult(3, 3)) end def test_div_bigdecimal x = BigDecimal.new((2**100).to_s) assert_equal(422550200076076467165567735125, x.div(3)) assert_equal(400000000000000000000000000000, x.div(3, 1)) assert_equal(420000000000000000000000000000, x.div(3, 2)) assert_equal(423000000000000000000000000000, x.div(3, 3)) end def test_abs_bigdecimal x = BigDecimal.new((2**100).to_s) assert_equal(1267650600228229401496703205376, x.abs) x = BigDecimal.new("-" + (2**100).to_s) assert_equal(1267650600228229401496703205376, x.abs) x = BigDecimal.new("0") assert_equal(0, x.abs) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) x = BigDecimal.new("NaN") assert_equal(true, x.abs.nan?) end def test_sqrt_bigdecimal x = BigDecimal.new("0.09") assert_in_delta(0.3, x.sqrt(1), 0.001) x = BigDecimal.new((2**100).to_s) y = BigDecimal("1125899906842624") e = y.exponent assert_equal(true, (x.sqrt(100) - y).abs < BigDecimal("1E#{e-100}")) assert_equal(true, (x.sqrt(200) - y).abs < BigDecimal("1E#{e-200}")) assert_equal(true, (x.sqrt(300) - y).abs < BigDecimal("1E#{e-300}")) x = BigDecimal.new("-" + (2**100).to_s) assert_raise(FloatDomainError) { x.sqrt(1) } x = BigDecimal.new((2**200).to_s) assert_equal(2**100, x.sqrt(1)) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) assert_raise(FloatDomainError) { BigDecimal.new("NaN").sqrt(1) } assert_equal(0, BigDecimal.new("0").sqrt(1)) assert_equal(1, BigDecimal.new("1").sqrt(1)) end def test_fix x = BigDecimal.new("1.1") assert_equal(1, x.fix) end def test_frac x = BigDecimal.new("1.1") assert_equal(0.1, x.frac) assert_equal(0.1, BigDecimal.new("0.1").frac) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) assert_equal(true, BigDecimal.new("NaN").frac.nan?) end def test_round assert_equal(3, BigDecimal.new("3.14159").round) assert_equal(9, BigDecimal.new("8.7").round) assert_equal(3.142, BigDecimal.new("3.14159").round(3)) assert_equal(13300.0, BigDecimal.new("13345.234").round(-2)) x = BigDecimal.new("111.111") assert_equal(111 , x.round) assert_equal(111.1 , x.round(1)) assert_equal(111.11 , x.round(2)) assert_equal(111.111, x.round(3)) assert_equal(111.111, x.round(4)) assert_equal(110 , x.round(-1)) assert_equal(100 , x.round(-2)) assert_equal( 0 , x.round(-3)) assert_equal( 0 , x.round(-4)) x = BigDecimal.new("2.5") assert_equal(3, x.round(0, BigDecimal::ROUND_UP)) assert_equal(2, x.round(0, BigDecimal::ROUND_DOWN)) assert_equal(3, x.round(0, BigDecimal::ROUND_HALF_UP)) assert_equal(2, x.round(0, BigDecimal::ROUND_HALF_DOWN)) assert_equal(2, x.round(0, BigDecimal::ROUND_HALF_EVEN)) assert_equal(3, x.round(0, BigDecimal::ROUND_CEILING)) assert_equal(2, x.round(0, BigDecimal::ROUND_FLOOR)) assert_raise(TypeError) { x.round(0, 256) } end def test_truncate assert_equal(3, BigDecimal.new("3.14159").truncate) assert_equal(8, BigDecimal.new("8.7").truncate) assert_equal(3.141, BigDecimal.new("3.14159").truncate(3)) assert_equal(13300.0, BigDecimal.new("13345.234").truncate(-2)) end def test_floor assert_equal(3, BigDecimal.new("3.14159").floor) assert_equal(-10, BigDecimal.new("-9.1").floor) assert_equal(3.141, BigDecimal.new("3.14159").floor(3)) assert_equal(13300.0, BigDecimal.new("13345.234").floor(-2)) end def test_ceil assert_equal(4, BigDecimal.new("3.14159").ceil) assert_equal(-9, BigDecimal.new("-9.1").ceil) assert_equal(3.142, BigDecimal.new("3.14159").ceil(3)) assert_equal(13400.0, BigDecimal.new("13345.234").ceil(-2)) end def test_to_s assert_equal('-123.45678 90123 45678 9', BigDecimal.new('-123.45678901234567890').to_s('5F')) assert_equal('+123.45678901 23456789', BigDecimal.new('123.45678901234567890').to_s('+8F')) assert_equal(' 123.4567890123456789', BigDecimal.new('123.45678901234567890').to_s(' F')) assert_equal('0.1234567890123456789E3', BigDecimal.new('123.45678901234567890').to_s) assert_equal('0.12345 67890 12345 6789E3', BigDecimal.new('123.45678901234567890').to_s(5)) end def test_split x = BigDecimal.new('-123.45678901234567890') assert_equal([-1, "1234567890123456789", 10, 3], x.split) assert_equal([1, "0", 10, 0], BigDecimal.new("0").split) assert_equal([-1, "0", 10, 0], BigDecimal.new("-0").split) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) assert_equal([0, "NaN", 10, 0], BigDecimal.new("NaN").split) assert_equal([1, "Infinity", 10, 0], BigDecimal.new("Infinity").split) assert_equal([-1, "Infinity", 10, 0], BigDecimal.new("-Infinity").split) end def test_exponent x = BigDecimal.new('-123.45678901234567890') assert_equal(3, x.exponent) end def test_inspect x = BigDecimal.new("1234.5678") prec, maxprec = x.precs assert_match(/^#$/, x.inspect) end def test_power x = BigDecimal.new("3") assert_equal(81, x ** 4) assert_equal(1.0/81, x ** -4) assert_equal(1, x ** 0) assert_raise(TypeError) { x ** x } assert_equal(0, BigDecimal.new("0") ** 4) assert_equal(1, BigDecimal.new("0") ** 0) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) assert_equal(BigDecimal.new("Infinity"), BigDecimal.new("0") ** -1) assert_equal(BigDecimal.new("-Infinity"), BigDecimal.new("-0") ** -1) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) assert_equal(true, (BigDecimal.new("NaN") ** 1).nan?) assert_equal(BigDecimal::SIGN_POSITIVE_INFINITE, (BigDecimal.new("Infinity") ** 2).sign) assert_equal(BigDecimal::SIGN_POSITIVE_INFINITE, (BigDecimal.new("Infinity") ** 1).sign) assert_equal(1, BigDecimal.new("Infinity") ** 0) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("Infinity") ** -1).sign) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("Infinity") ** -2).sign) assert_equal(BigDecimal::SIGN_POSITIVE_INFINITE, (BigDecimal.new("-Infinity") ** 2).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_INFINITE, (BigDecimal.new("-Infinity") ** 1).sign) assert_equal(1, BigDecimal.new("-Infinity") ** 0) assert_equal(BigDecimal::SIGN_NEGATIVE_ZERO, (BigDecimal.new("-Infinity") ** -1).sign) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (BigDecimal.new("-Infinity") ** -2).sign) end def test_limit BigDecimal.limit(1) x = BigDecimal.new("3") assert_equal(90, x ** 4) # OK? must it be 80? # 3 * 3 * 3 * 3 = 10 * 3 * 3 = 30 * 3 = 90 ??? assert_raise(ArgumentError) { BigDecimal.limit(-1) } end def test_sign BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, BigDecimal.new("0").sign) assert_equal(BigDecimal::SIGN_NEGATIVE_ZERO, BigDecimal.new("-0").sign) assert_equal(BigDecimal::SIGN_POSITIVE_FINITE, BigDecimal.new("1").sign) assert_equal(BigDecimal::SIGN_NEGATIVE_FINITE, BigDecimal.new("-1").sign) assert_equal(BigDecimal::SIGN_POSITIVE_INFINITE, (BigDecimal.new("1") / 0).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_INFINITE, (BigDecimal.new("-1") / 0).sign) assert_equal(BigDecimal::SIGN_NaN, (BigDecimal.new("0") / 0).sign) end def test_inf BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) inf = BigDecimal.new("Infinity") assert_equal(inf, inf + inf) assert_equal(true, (inf + (-inf)).nan?) assert_equal(true, (inf - inf).nan?) assert_equal(inf, inf - (-inf)) assert_equal(inf, inf * inf) assert_equal(true, (inf / inf).nan?) assert_equal(inf, inf + 1) assert_equal(inf, inf - 1) assert_equal(inf, inf * 1) assert_equal(true, (inf * 0).nan?) assert_equal(inf, inf / 1) assert_equal(inf, 1 + inf) assert_equal(-inf, 1 - inf) assert_equal(inf, 1 * inf) assert_equal(-inf, -1 * inf) assert_equal(true, (0 * inf).nan?) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, (1 / inf).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_ZERO, (-1 / inf).sign) end def test_to_special_string BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false) nan = BigDecimal.new("NaN") assert_equal("NaN", nan.to_s) inf = BigDecimal.new("Infinity") assert_equal("Infinity", inf.to_s) assert_equal(" Infinity", inf.to_s(" ")) assert_equal("+Infinity", inf.to_s("+")) assert_equal("-Infinity", (-inf).to_s) pzero = BigDecimal.new("0") assert_equal("0.0", pzero.to_s) assert_equal(" 0.0", pzero.to_s(" ")) assert_equal("+0.0", pzero.to_s("+")) assert_equal("-0.0", (-pzero).to_s) end def test_to_string assert_equal("0.01", BigDecimal("0.01").to_s("F")) s = "0." + "0" * 100 + "1" assert_equal(s, BigDecimal(s).to_s("F")) s = "1" + "0" * 100 + ".0" assert_equal(s, BigDecimal(s).to_s("F")) end def test_ctov assert_equal(0.1, BigDecimal.new("1E-1")) assert_equal(10, BigDecimal.new("1E+1")) assert_equal(1, BigDecimal.new("+1")) BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false) assert_equal(BigDecimal::SIGN_POSITIVE_INFINITE, BigDecimal.new("1E1" + "0" * 10000).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_INFINITE, BigDecimal.new("-1E1" + "0" * 10000).sign) assert_equal(BigDecimal::SIGN_POSITIVE_ZERO, BigDecimal.new("1E-1" + "0" * 10000).sign) assert_equal(BigDecimal::SIGN_NEGATIVE_ZERO, BigDecimal.new("-1E-1" + "0" * 10000).sign) end end