mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
2308fb170e
treat 0.0 and -0.0 of floating-point numbers specially for an optimization and to correctly propagate its signbit to the result. [Bug #9214] [ruby-core:58858] * test/bigdecimal/test_bigdecimal.rb: add tests case for the above change. * test/bigdecimal/test_bigdecimal_util.rb: ditto. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44021 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
50 lines
1.4 KiB
Ruby
50 lines
1.4 KiB
Ruby
require_relative "testbase"
|
|
|
|
require 'bigdecimal/util'
|
|
|
|
class TestBigDecimalUtil < Test::Unit::TestCase
|
|
def test_BigDecimal_to_d
|
|
x = BigDecimal(1)
|
|
assert_same(x, x.to_d)
|
|
end
|
|
|
|
def test_Integer_to_d
|
|
assert_equal(BigDecimal(1), 1.to_d)
|
|
assert_equal(BigDecimal(2<<100), (2<<100).to_d)
|
|
end
|
|
|
|
def test_Float_to_d_without_precision
|
|
delta = 1.0/10**(Float::DIG)
|
|
assert_in_delta(BigDecimal(0.5, Float::DIG), 0.5.to_d, delta)
|
|
assert_in_delta(BigDecimal(355.0/113.0, Float::DIG), (355.0/113.0).to_d, delta)
|
|
assert_equal(9.05.to_d.to_s('F'), "9.05")
|
|
|
|
bug9214 = '[ruby-core:58858]'
|
|
assert_equal((-0.0).to_d.sign, -1, bug9214)
|
|
end
|
|
|
|
def test_Float_to_d_with_precision
|
|
digits = 5
|
|
delta = 1.0/10**(digits)
|
|
assert_in_delta(BigDecimal(0.5, 5), 0.5.to_d(digits), delta)
|
|
assert_in_delta(BigDecimal(355.0/113.0, 5), (355.0/113.0).to_d(digits), delta)
|
|
|
|
bug9214 = '[ruby-core:58858]'
|
|
assert_equal((-0.0).to_d(digits).sign, -1, bug9214)
|
|
end
|
|
|
|
def test_Rational_to_d
|
|
digits = 100
|
|
delta = 1.0/10**(digits)
|
|
assert_in_delta(BigDecimal(1.quo(2), digits), 1.quo(2).to_d(digits), delta)
|
|
assert_in_delta(BigDecimal(355.quo(113), digits), 355.quo(113).to_d(digits), delta)
|
|
end
|
|
|
|
def test_Rational_to_d_with_zero_precision
|
|
assert_raise(ArgumentError) { 355.quo(113).to_d(0) }
|
|
end
|
|
|
|
def test_Rational_to_d_with_negative_precision
|
|
assert_raise(ArgumentError) { 355.quo(113).to_d(-42) }
|
|
end
|
|
end
|