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ruby--ruby/test/ruby/test_float.rb
naruse 3e92b635fb Add frozen_string_literal: false for all files 
When you change this to true, you may need to add more tests.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2015-12-16 05:07:31 +00:00

708 lines
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Ruby
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# frozen_string_literal: false
require 'test/unit'
class TestFloat < Test::Unit::TestCase
include EnvUtil
def test_float
assert_equal(2, 2.6.floor)
assert_equal(-3, (-2.6).floor)
assert_equal(3, 2.6.ceil)
assert_equal(-2, (-2.6).ceil)
assert_equal(2, 2.6.truncate)
assert_equal(-2, (-2.6).truncate)
assert_equal(3, 2.6.round)
assert_equal(-2, (-2.4).truncate)
assert_in_delta(13.4 % 1, 0.4, 0.0001)
assert_equal(36893488147419111424,
36893488147419107329.0.to_i)
end
def nan_test(x,y)
extend Test::Unit::Assertions
assert_operator(x, :!=, y)
assert_not_operator(x, :<, y)
assert_not_operator(x, :>, y)
assert_not_operator(x, :<=, y)
assert_not_operator(x, :>=, y)
end
def test_nan
nan = Float::NAN
nan_test(nan, nan)
nan_test(nan, 0)
nan_test(nan, 1)
nan_test(nan, -1)
nan_test(nan, 1000)
nan_test(nan, -1000)
nan_test(nan, 1_000_000_000_000)
nan_test(nan, -1_000_000_000_000)
nan_test(nan, 100.0);
nan_test(nan, -100.0);
nan_test(nan, 0.001);
nan_test(nan, -0.001);
nan_test(nan, 1.0/0);
nan_test(nan, -1.0/0);
end
def test_precision
u = 3.7517675036461267e+17
v = sprintf("%.16e", u).to_f
assert_in_delta(u, v, u.abs * Float::EPSILON)
assert_in_delta(u, v, v.abs * Float::EPSILON)
end
def test_symmetry_bignum # [ruby-bugs-ja:118]
a = 100000000000000000000000
b = 100000000000000000000000.0
assert_equal(a == b, b == a)
end
def test_cmp_int
100.times {|i|
int0 = 1 << i
[int0, -int0].each {|int|
flt = int.to_f
bigger = int + 1
smaller = int - 1
assert_operator(flt, :==, int)
assert_operator(flt, :>, smaller)
assert_operator(flt, :>=, smaller)
assert_operator(flt, :<, bigger)
assert_operator(flt, :<=, bigger)
assert_equal(0, flt <=> int)
assert_equal(-1, flt <=> bigger)
assert_equal(1, flt <=> smaller)
assert_operator(int, :==, flt)
assert_operator(bigger, :>, flt)
assert_operator(bigger, :>=, flt)
assert_operator(smaller, :<, flt)
assert_operator(smaller, :<=, flt)
assert_equal(0, int <=> flt)
assert_equal(-1, smaller <=> flt)
assert_equal(1, bigger <=> flt)
[
[int, flt + 0.5, bigger],
[smaller, flt - 0.5, int]
].each {|smaller2, flt2, bigger2|
next if flt2 == flt2.round
assert_operator(flt2, :!=, smaller2)
assert_operator(flt2, :!=, bigger2)
assert_operator(flt2, :>, smaller2)
assert_operator(flt2, :>=, smaller2)
assert_operator(flt2, :<, bigger2)
assert_operator(flt2, :<=, bigger2)
assert_equal(-1, flt2 <=> bigger2)
assert_equal(1, flt2 <=> smaller2)
assert_operator(smaller2, :!=, flt2)
assert_operator(bigger2, :!=, flt2)
assert_operator(bigger2, :>, flt2)
assert_operator(bigger2, :>=, flt2)
assert_operator(smaller2, :<, flt2)
assert_operator(smaller2, :<=, flt2)
assert_equal(-1, smaller2 <=> flt2)
assert_equal(1, bigger2 <=> flt2)
}
}
}
end
def test_strtod
a = Float("0")
assert_in_delta(a, 0, Float::EPSILON)
a = Float("0.0")
assert_in_delta(a, 0, Float::EPSILON)
a = Float("+0.0")
assert_in_delta(a, 0, Float::EPSILON)
a = Float("-0.0")
assert_in_delta(a, 0, Float::EPSILON)
a = Float("0.0000000000000000001")
assert_not_equal(0.0, a)
a = Float("+0.0000000000000000001")
assert_not_equal(0.0, a)
a = Float("-0.0000000000000000001")
assert_not_equal(0.0, a)
a = Float(".0")
assert_in_delta(a, 0, Float::EPSILON)
a = Float("+.0")
assert_in_delta(a, 0, Float::EPSILON)
a = Float("-.0")
assert_in_delta(a, 0, Float::EPSILON)
assert_raise(ArgumentError){Float("0.")}
assert_raise(ArgumentError){Float("+0.")}
assert_raise(ArgumentError){Float("-0.")}
assert_raise(ArgumentError){Float(".")}
assert_raise(ArgumentError){Float("+")}
assert_raise(ArgumentError){Float("+.")}
assert_raise(ArgumentError){Float("-")}
assert_raise(ArgumentError){Float("-.")}
assert_raise(ArgumentError){Float("1e")}
assert_raise(ArgumentError){Float("1__1")}
assert_raise(ArgumentError){Float("1.")}
assert_raise(ArgumentError){Float("1.e+00")}
assert_raise(ArgumentError){Float("0x1.p+0")}
# add expected behaviour here.
assert_equal(10, Float("1_0"))
assert_equal([ 0.0].pack('G'), [Float(" 0x0p+0").to_f].pack('G'))
assert_equal([-0.0].pack('G'), [Float("-0x0p+0").to_f].pack('G'))
assert_equal(255.0, Float("0Xff"))
assert_equal(1024.0, Float("0x1p10"))
assert_equal(1024.0, Float("0x1p+10"))
assert_equal(0.0009765625, Float("0x1p-10"))
assert_equal(2.6881171418161356e+43, Float("0x1.3494a9b171bf5p+144"))
assert_equal(-3.720075976020836e-44, Float("-0x1.a8c1f14e2af5dp-145"))
assert_equal(31.0*2**1019, Float("0x0."+("0"*268)+"1fp2099"))
assert_equal(31.0*2**1019, Float("0x0."+("0"*600)+"1fp3427"))
assert_equal(-31.0*2**1019, Float("-0x0."+("0"*268)+"1fp2099"))
assert_equal(-31.0*2**1019, Float("-0x0."+("0"*600)+"1fp3427"))
suppress_warning do
assert_equal(31.0*2**-1027, Float("0x1f"+("0"*268)+".0p-2099"))
assert_equal(31.0*2**-1027, Float("0x1f"+("0"*600)+".0p-3427"))
assert_equal(-31.0*2**-1027, Float("-0x1f"+("0"*268)+".0p-2099"))
assert_equal(-31.0*2**-1027, Float("-0x1f"+("0"*600)+".0p-3427"))
end
end
def test_divmod
assert_equal([2, 3.5], 11.5.divmod(4))
assert_equal([-3, -0.5], 11.5.divmod(-4))
assert_equal([-3, 0.5], (-11.5).divmod(4))
assert_equal([2, -3.5], (-11.5).divmod(-4))
assert_raise(FloatDomainError) { Float::NAN.divmod(2) }
assert_raise(FloatDomainError) { Float::INFINITY.divmod(2) }
end
def test_div
assert_equal(2, 11.5.div(4))
assert_equal(-3, 11.5.div(-4))
assert_equal(-3, (-11.5).div(4))
assert_equal(2, (-11.5).div(-4))
assert_raise(FloatDomainError) { 11.5.div(Float::NAN).nan? }
assert_raise(FloatDomainError) { Float::NAN.div(2).nan? }
assert_raise(FloatDomainError) { Float::NAN.div(11.5).nan? }
end
def test_modulo
assert_equal(3.5, 11.5.modulo(4))
assert_equal(-0.5, 11.5.modulo(-4))
assert_equal(0.5, (-11.5).modulo(4))
assert_equal(-3.5, (-11.5).modulo(-4))
end
def test_remainder
assert_equal(3.5, 11.5.remainder(4))
assert_equal(3.5, 11.5.remainder(-4))
assert_equal(-3.5, (-11.5).remainder(4))
assert_equal(-3.5, (-11.5).remainder(-4))
assert_predicate(Float::NAN.remainder(4), :nan?)
assert_predicate(4.remainder(Float::NAN), :nan?)
end
def test_to_s
inf = Float::INFINITY
assert_equal("Infinity", inf.to_s)
assert_equal("-Infinity", (-inf).to_s)
assert_equal("NaN", (inf / inf).to_s)
assert_equal("1.0e+18", 1000_00000_00000_00000.0.to_s)
bug3273 = '[ruby-core:30145]'
[0.21611564636388508, 0.56].each do |f|
s = f.to_s
assert_equal(f, s.to_f, bug3273)
assert_not_equal(f, s.chop.to_f, bug3273)
end
end
def test_coerce
assert_equal(Float, 1.0.coerce(1).first.class)
end
def test_plus
assert_equal(4.0, 2.0.send(:+, 2))
assert_equal(4.0, 2.0.send(:+, (2**32).coerce(2).first))
assert_equal(4.0, 2.0.send(:+, 2.0))
assert_equal(Float::INFINITY, 2.0.send(:+, Float::INFINITY))
assert_predicate(2.0.send(:+, Float::NAN), :nan?)
assert_raise(TypeError) { 2.0.send(:+, nil) }
end
def test_minus
assert_equal(0.0, 2.0.send(:-, 2))
assert_equal(0.0, 2.0.send(:-, (2**32).coerce(2).first))
assert_equal(0.0, 2.0.send(:-, 2.0))
assert_equal(-Float::INFINITY, 2.0.send(:-, Float::INFINITY))
assert_predicate(2.0.send(:-, Float::NAN), :nan?)
assert_raise(TypeError) { 2.0.send(:-, nil) }
end
def test_mul
assert_equal(4.0, 2.0.send(:*, 2))
assert_equal(4.0, 2.0.send(:*, (2**32).coerce(2).first))
assert_equal(4.0, 2.0.send(:*, 2.0))
assert_equal(Float::INFINITY, 2.0.send(:*, Float::INFINITY))
assert_raise(TypeError) { 2.0.send(:*, nil) }
end
def test_div2
assert_equal(1.0, 2.0.send(:/, 2))
assert_equal(1.0, 2.0.send(:/, (2**32).coerce(2).first))
assert_equal(1.0, 2.0.send(:/, 2.0))
assert_equal(0.0, 2.0.send(:/, Float::INFINITY))
assert_raise(TypeError) { 2.0.send(:/, nil) }
end
def test_modulo2
assert_equal(0.0, 2.0.send(:%, 2))
assert_equal(0.0, 2.0.send(:%, (2**32).coerce(2).first))
assert_equal(0.0, 2.0.send(:%, 2.0))
assert_raise(TypeError) { 2.0.send(:%, nil) }
end
def test_modulo3
bug6048 = '[ruby-core:42726]'
assert_equal(4.2, 4.2.send(:%, Float::INFINITY), bug6048)
assert_equal(4.2, 4.2 % Float::INFINITY, bug6048)
assert_is_minus_zero(-0.0 % 4.2)
assert_is_minus_zero(-0.0.send :%, 4.2)
assert_raise(ZeroDivisionError, bug6048) { 4.2.send(:%, 0.0) }
assert_raise(ZeroDivisionError, bug6048) { 4.2 % 0.0 }
assert_raise(ZeroDivisionError, bug6048) { 42.send(:%, 0) }
assert_raise(ZeroDivisionError, bug6048) { 42 % 0 }
end
def test_modulo4
assert_predicate((0.0).modulo(Float::NAN), :nan?)
assert_predicate((1.0).modulo(Float::NAN), :nan?)
assert_predicate(Float::INFINITY.modulo(1), :nan?)
end
def test_divmod2
assert_equal([1.0, 0.0], 2.0.divmod(2))
assert_equal([1.0, 0.0], 2.0.divmod((2**32).coerce(2).first))
assert_equal([1.0, 0.0], 2.0.divmod(2.0))
assert_raise(TypeError) { 2.0.divmod(nil) }
inf = Float::INFINITY
assert_raise(ZeroDivisionError) {inf.divmod(0)}
a, b = (2.0**32).divmod(1.0)
assert_equal(2**32, a)
assert_equal(0, b)
end
def test_pow
assert_equal(1.0, 1.0 ** (2**32))
assert_equal(1.0, 1.0 ** 1.0)
assert_raise(TypeError) { 1.0 ** nil }
end
def test_eql
inf = Float::INFINITY
nan = Float::NAN
assert_operator(1.0, :eql?, 1.0)
assert_operator(inf, :eql?, inf)
assert_not_operator(nan, :eql?, nan)
assert_not_operator(1.0, :eql?, nil)
assert_equal(1.0, 1)
assert_not_equal(1.0, 2**32)
assert_not_equal(1.0, nan)
assert_not_equal(1.0, nil)
end
def test_cmp
inf = Float::INFINITY
nan = Float::NAN
assert_equal(0, 1.0 <=> 1.0)
assert_equal(1, 1.0 <=> 0.0)
assert_equal(-1, 1.0 <=> 2.0)
assert_nil(1.0 <=> nil)
assert_nil(1.0 <=> nan)
assert_nil(nan <=> 1.0)
assert_equal(0, 1.0 <=> 1)
assert_equal(1, 1.0 <=> 0)
assert_equal(-1, 1.0 <=> 2)
assert_equal(-1, 1.0 <=> 2**32)
assert_equal(1, inf <=> (Float::MAX.to_i*2))
assert_equal(-1, -inf <=> (-Float::MAX.to_i*2))
assert_equal(-1, (Float::MAX.to_i*2) <=> inf)
assert_equal(1, (-Float::MAX.to_i*2) <=> -inf)
bug3609 = '[ruby-core:31470]'
def (pinf = Object.new).infinite?; +1 end
def (ninf = Object.new).infinite?; -1 end
def (fin = Object.new).infinite?; nil end
nonum = Object.new
assert_equal(0, inf <=> pinf, bug3609)
assert_equal(1, inf <=> fin, bug3609)
assert_equal(1, inf <=> ninf, bug3609)
assert_nil(inf <=> nonum, bug3609)
assert_equal(-1, -inf <=> pinf, bug3609)
assert_equal(-1, -inf <=> fin, bug3609)
assert_equal(0, -inf <=> ninf, bug3609)
assert_nil(-inf <=> nonum, bug3609)
assert_raise(ArgumentError) { 1.0 > nil }
assert_raise(ArgumentError) { 1.0 >= nil }
assert_raise(ArgumentError) { 1.0 < nil }
assert_raise(ArgumentError) { 1.0 <= nil }
end
def test_zero_p
assert_predicate(0.0, :zero?)
assert_not_predicate(1.0, :zero?)
end
def test_positive_p
assert_predicate(+1.0, :positive?)
assert_not_predicate(+0.0, :positive?)
assert_not_predicate(-0.0, :positive?)
assert_not_predicate(-1.0, :positive?)
assert_predicate(+(0.0.next_float), :positive?)
assert_not_predicate(-(0.0.next_float), :positive?)
assert_predicate(Float::INFINITY, :positive?)
assert_not_predicate(-Float::INFINITY, :positive?)
assert_not_predicate(Float::NAN, :positive?)
end
def test_negative_p
assert_predicate(-1.0, :negative?)
assert_not_predicate(-0.0, :negative?)
assert_not_predicate(+0.0, :negative?)
assert_not_predicate(+1.0, :negative?)
assert_predicate(-(0.0.next_float), :negative?)
assert_not_predicate(+(0.0.next_float), :negative?)
assert_predicate(-Float::INFINITY, :negative?)
assert_not_predicate(Float::INFINITY, :negative?)
assert_not_predicate(Float::NAN, :negative?)
end
def test_infinite_p
inf = Float::INFINITY
assert_equal(1, inf.infinite?)
assert_equal(-1, (-inf).infinite?)
assert_nil(1.0.infinite?)
end
def test_finite_p
inf = Float::INFINITY
assert_not_predicate(inf, :finite?)
assert_not_predicate(-inf, :finite?)
assert_predicate(1.0, :finite?)
end
def test_floor_ceil_round_truncate
assert_equal(1, 1.5.floor)
assert_equal(2, 1.5.ceil)
assert_equal(2, 1.5.round)
assert_equal(1, 1.5.truncate)
assert_equal(2, 2.0.floor)
assert_equal(2, 2.0.ceil)
assert_equal(2, 2.0.round)
assert_equal(2, 2.0.truncate)
assert_equal(-2, (-1.5).floor)
assert_equal(-1, (-1.5).ceil)
assert_equal(-2, (-1.5).round)
assert_equal(-1, (-1.5).truncate)
assert_equal(-2, (-2.0).floor)
assert_equal(-2, (-2.0).ceil)
assert_equal(-2, (-2.0).round)
assert_equal(-2, (-2.0).truncate)
inf = Float::INFINITY
assert_raise(FloatDomainError) { inf.floor }
assert_raise(FloatDomainError) { inf.ceil }
assert_raise(FloatDomainError) { inf.round }
assert_raise(FloatDomainError) { inf.truncate }
end
def test_round_with_precision
assert_equal(1.100, 1.111.round(1))
assert_equal(1.110, 1.111.round(2))
assert_equal(11110.0, 11111.1.round(-1))
assert_equal(11100.0, 11111.1.round(-2))
assert_equal(10**300, 1.1e300.round(-300))
assert_equal(-10**300, -1.1e300.round(-300))
assert_equal(1.0e-300, 1.1e-300.round(300))
assert_equal(-1.0e-300, -1.1e-300.round(300))
bug5227 = '[ruby-core:39093]'
assert_equal(42.0, 42.0.round(308), bug5227)
assert_equal(1.0e307, 1.0e307.round(2), bug5227)
assert_raise(TypeError) {1.0.round("4")}
assert_raise(TypeError) {1.0.round(nil)}
def (prec = Object.new).to_int; 2; end
assert_equal(1.0, 0.998.round(prec))
end
VS = [
18446744073709551617.0,
18446744073709551616.0,
18446744073709551615.8,
18446744073709551615.5,
18446744073709551615.2,
18446744073709551615.0,
18446744073709551614.0,
4611686018427387905.0,
4611686018427387904.0,
4611686018427387903.8,
4611686018427387903.5,
4611686018427387903.2,
4611686018427387903.0,
4611686018427387902.0,
4294967297.0,
4294967296.0,
4294967295.8,
4294967295.5,
4294967295.2,
4294967295.0,
4294967294.0,
1073741825.0,
1073741824.0,
1073741823.8,
1073741823.5,
1073741823.2,
1073741823.0,
1073741822.0,
-1073741823.0,
-1073741824.0,
-1073741824.2,
-1073741824.5,
-1073741824.8,
-1073741825.0,
-1073741826.0,
-4294967295.0,
-4294967296.0,
-4294967296.2,
-4294967296.5,
-4294967296.8,
-4294967297.0,
-4294967298.0,
-4611686018427387903.0,
-4611686018427387904.0,
-4611686018427387904.2,
-4611686018427387904.5,
-4611686018427387904.8,
-4611686018427387905.0,
-4611686018427387906.0,
-18446744073709551615.0,
-18446744073709551616.0,
-18446744073709551616.2,
-18446744073709551616.5,
-18446744073709551616.8,
-18446744073709551617.0,
-18446744073709551618.0,
]
def test_truncate
VS.each {|f|
i = f.truncate
assert_equal(i, f.to_i)
if f < 0
assert_operator(i, :<, 0)
else
assert_operator(i, :>, 0)
end
assert_operator(i.abs, :<=, f.abs)
d = f.abs - i.abs
assert_operator(0, :<=, d)
assert_operator(d, :<, 1)
}
end
def test_ceil
VS.each {|f|
i = f.ceil
if f < 0
assert_operator(i, :<, 0)
else
assert_operator(i, :>, 0)
end
assert_operator(i, :>=, f)
d = f - i
assert_operator(-1, :<, d)
assert_operator(d, :<=, 0)
}
end
def test_floor
VS.each {|f|
i = f.floor
if f < 0
assert_operator(i, :<, 0)
else
assert_operator(i, :>, 0)
end
assert_operator(i, :<=, f)
d = f - i
assert_operator(0, :<=, d)
assert_operator(d, :<, 1)
}
end
def test_round
VS.each {|f|
msg = "round(#{f})"
i = f.round
if f < 0
assert_operator(i, :<, 0, msg)
else
assert_operator(i, :>, 0, msg)
end
d = f - i
assert_operator(-0.5, :<=, d, msg)
assert_operator(d, :<=, 0.5, msg)
}
end
def test_Float
assert_in_delta(0.125, Float("0.1_2_5"), 0.00001)
assert_in_delta(0.125, "0.1_2_5__".to_f, 0.00001)
assert_equal(1, suppress_warning {Float(([1] * 10000).join)}.infinite?)
assert_not_predicate(Float(([1] * 10000).join("_")), :infinite?) # is it really OK?
assert_raise(ArgumentError) { Float("1.0\x001") }
assert_equal(15.9375, Float('0xf.fp0'))
assert_raise(ArgumentError) { Float('0x') }
assert_equal(15, Float('0xf'))
assert_equal(15, Float('0xfp0'))
assert_raise(ArgumentError) { Float('0xfp') }
assert_raise(ArgumentError) { Float('0xf.') }
assert_raise(ArgumentError) { Float('0xf.p') }
assert_raise(ArgumentError) { Float('0xf.p0') }
assert_raise(ArgumentError) { Float('0xf.f') }
assert_raise(ArgumentError) { Float('0xf.fp') }
assert_equal(Float::INFINITY, Float('0xf.fp1000000000000000'))
assert_equal(1, suppress_warning {Float("1e10_00")}.infinite?)
assert_raise(TypeError) { Float(nil) }
o = Object.new
def o.to_f; inf = Float::INFINITY; inf/inf; end
assert_predicate(Float(o), :nan?)
end
def test_invalid_str
bug4310 = '[ruby-core:34820]'
assert_raise(ArgumentError, bug4310) {under_gc_stress {Float('a'*10000)}}
end
def test_num2dbl
assert_raise(ArgumentError) do
1.0.step(2.0, "0.5") {}
end
assert_raise(TypeError) do
1.0.step(2.0, nil) {}
end
end
def test_sleep_with_Float
assert_nothing_raised("[ruby-core:23282]") do
sleep(0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1)
end
end
def test_step
1000.times do
a = rand
b = a+rand*1000
s = (b - a) / 10
assert_equal(11, (a..b).step(s).to_a.length)
end
(1.0..12.7).step(1.3).each do |n|
assert_operator(n, :<=, 12.7)
end
assert_equal([5.0, 4.0, 3.0, 2.0], 5.0.step(1.5, -1).to_a)
end
def test_step2
assert_equal([0.0], 0.0.step(1.0, Float::INFINITY).to_a)
end
def test_step_excl
1000.times do
a = rand
b = a+rand*1000
s = (b - a) / 10
assert_equal(10, (a...b).step(s).to_a.length)
end
assert_equal([1.0, 2.9, 4.8, 6.699999999999999], (1.0...6.8).step(1.9).to_a)
e = 1+1E-12
(1.0 ... e).step(1E-16) do |n|
assert_operator(n, :<=, e)
end
end
def test_singleton_method
# flonum on 64bit platform
assert_raise(TypeError) { a = 1.0; def a.foo; end }
# always not flonum
assert_raise(TypeError) { a = Float::INFINITY; def a.foo; end }
end
def test_long_string
assert_separately([], <<-'end;')
assert_in_epsilon(10.0, ("1."+"1"*300000).to_f*9)
end;
end
def test_next_float
smallest = 0.0.next_float
assert_equal(-Float::MAX, (-Float::INFINITY).next_float)
assert_operator(-Float::MAX, :<, (-Float::MAX).next_float)
assert_equal(Float::EPSILON/2, (-1.0).next_float + 1.0)
assert_operator(0.0, :<, smallest)
assert_operator([0.0, smallest], :include?, smallest/2)
assert_equal(Float::EPSILON, 1.0.next_float - 1.0)
assert_equal(Float::INFINITY, Float::MAX.next_float)
assert_equal(Float::INFINITY, Float::INFINITY.next_float)
assert_predicate(Float::NAN.next_float, :nan?)
end
def test_prev_float
smallest = 0.0.next_float
assert_equal(-Float::INFINITY, (-Float::INFINITY).prev_float)
assert_equal(-Float::INFINITY, (-Float::MAX).prev_float)
assert_equal(-Float::EPSILON, (-1.0).prev_float + 1.0)
assert_equal(-smallest, 0.0.prev_float)
assert_operator([0.0, 0.0.prev_float], :include?, 0.0.prev_float/2)
assert_equal(-Float::EPSILON/2, 1.0.prev_float - 1.0)
assert_operator(Float::MAX, :>, Float::MAX.prev_float)
assert_equal(Float::MAX, Float::INFINITY.prev_float)
assert_predicate(Float::NAN.prev_float, :nan?)
end
def test_next_prev_float_zero
z = 0.0.next_float.prev_float
assert_equal(0.0, z)
assert_equal(Float::INFINITY, 1.0/z)
z = 0.0.prev_float.next_float
assert_equal(0.0, z)
assert_equal(-Float::INFINITY, 1.0/z)
end
def test_hash_0
bug10979 = '[ruby-core:68541] [Bug #10979]'
assert_equal(+0.0.hash, -0.0.hash)
assert_operator(+0.0, :eql?, -0.0)
h = {0.0 => bug10979}
assert_equal(bug10979, h[-0.0])
end
end
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