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test_big_decimal.rb
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test_big_decimal.rb
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require 'test/unit'
require 'bigdecimal'
class TestBigDecimal < Test::Unit::TestCase
def test_bad_to_s_format_strings
bd = BigDecimal.new("1")
assert_equal("0.1E1", bd.to_s)
assert_equal("+0.1E1", bd.to_s("+-2"))
assert_equal("0.23", BigDecimal.new("0.23").to_s("F"))
end
def test_no_singleton_methods_on_bigdecimal
num = BigDecimal.new("0.001")
assert_raise(TypeError) { class << num ; def amethod ; end ; end }
assert_raise(TypeError) { def num.amethod ; end }
end
def test_can_instantiate_big_decimal
assert_nothing_raised {BigDecimal.new("4")}
assert_nothing_raised {BigDecimal.new("3.14159")}
end
def test_can_implicitly_instantiate_big_decimal
# JRUBY-153 issues
assert_nothing_raised {BigDecimal("4")}
assert_nothing_raised {BigDecimal("3.14159")}
end
def test_reject_arguments_not_responding_to_to_str
assert_raise(TypeError) { BigDecimal.new(4) }
assert_raise(TypeError) { BigDecimal.new(3.14159) }
assert_raise(TypeError) { BigDecimal(4) }
assert_raise(TypeError) { BigDecimal(3.14159) }
end
def test_alphabetic_args_return_zero
assert_equal( BigDecimal("0.0"), BigDecimal("XXX"),
'Big Decimal objects instanitiated with a value that starts
with a letter should have a value of 0.0' )
end
class X
def to_str; "3.14159" end
end
def test_can_accept_arbitrary_objects_as_arguments
# as log as the object has a #to_str method...
x = X.new
assert_nothing_raised { BigDecimal.new(x) }
assert_nothing_raised { BigDecimal(x) }
end
require "bigdecimal/newton"
include Newton
class Function
def initialize()
@zero = BigDecimal::new("0.0")
@one = BigDecimal::new("1.0")
@two = BigDecimal::new("2.0")
@ten = BigDecimal::new("10.0")
@eps = BigDecimal::new("1.0e-16")
end
def zero;@zero;end
def one ;@one ;end
def two ;@two ;end
def ten ;@ten ;end
def eps ;@eps ;end
def values(x) # <= defines functions solved
f = []
f1 = x[0]*x[0] + x[1]*x[1] - @two # f1 = x**2 + y**2 - 2 => 0
f2 = x[0] - x[1] # f2 = x - y => 0
f <<= f1
f <<= f2
f
end
end
def test_newton_extension
f = BigDecimal::limit(100)
f = Function.new
x = [f.zero,f.zero] # Initial values
n = nlsolve(f,x)
expected = [BigDecimal('0.1000000000262923315461642086010446338567975310185638386446002778855192224707966221794469725479649528E1'),
BigDecimal('0.1000000000262923315461642086010446338567975310185638386446002778855192224707966221794469725479649528E1')]
assert_equal expected, x
end
require "bigdecimal/math.rb"
include BigMath
def test_math_extension
expected = BigDecimal('0.31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066453462141417033006060218E1')
# this test fails under C Ruby
# ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.9.1]
assert_equal expected, PI(100)
zero= BigDecimal("0")
one = BigDecimal("1")
two = BigDecimal("2")
three = BigDecimal("3")
assert_equal one * 1, one
assert_equal one / 1, one
assert_equal one + 1, two
assert_equal one - 1, zero
assert_equal zero, one % 1
assert_equal one, three % two
assert_equal BigDecimal("0.2"), BigDecimal("2.2") % two
assert_equal BigDecimal("0.003"), BigDecimal("15.993") % BigDecimal("15.99")
assert_equal 1*one, one
assert_equal 1/one, one
assert_equal 1+one, BigDecimal("2")
assert_equal 1-one, BigDecimal("0")
assert_equal one * 1.0, 1.0
assert_equal one / 1.0, 1.0
assert_equal one + 1.0, 2.0
assert_equal one - 1.0, 0.0
assert_equal 1.0*one, 1.0
assert_equal 1.0/one, 1.0
assert_equal 1.0+one, 2.0
assert_equal 1.0-one, 0.0
assert_equal("1.0", BigDecimal.new('1.0').to_s('F'))
assert_equal("0.0", BigDecimal.new('0.0').to_s)
assert_equal(BigDecimal("2"), BigDecimal("1.5").round)
assert_equal(BigDecimal("15"), BigDecimal("15").round)
assert_equal(BigDecimal("20"), BigDecimal("15").round(-1))
assert_equal(BigDecimal("0"), BigDecimal("15").round(-2))
assert_equal(BigDecimal("-10"), BigDecimal("-15").round(-1, BigDecimal::ROUND_CEILING))
assert_equal(BigDecimal("10"), BigDecimal("15").round(-1, BigDecimal::ROUND_HALF_DOWN))
assert_equal(BigDecimal("20"), BigDecimal("25").round(-1, BigDecimal::ROUND_HALF_EVEN))
assert_equal(BigDecimal("15.99"), BigDecimal("15.993").round(2))
assert_equal(BigDecimal("1"), BigDecimal("1.8").round(0, BigDecimal::ROUND_DOWN))
assert_equal(BigDecimal("2"), BigDecimal("1.2").round(0, BigDecimal::ROUND_UP))
assert_equal(BigDecimal("-1"), BigDecimal("-1.5").round(0, BigDecimal::ROUND_CEILING))
assert_equal(BigDecimal("-2"), BigDecimal("-1.5").round(0, BigDecimal::ROUND_FLOOR))
assert_equal(BigDecimal("-2"), BigDecimal("-1.5").round(0, BigDecimal::ROUND_FLOOR))
assert_equal(BigDecimal("1"), BigDecimal("1.5").round(0, BigDecimal::ROUND_HALF_DOWN))
assert_equal(BigDecimal("2"), BigDecimal("1.5").round(0, BigDecimal::ROUND_HALF_EVEN))
assert_equal(BigDecimal("2"), BigDecimal("2.5").round(0, BigDecimal::ROUND_HALF_EVEN))
end
def test_big_decimal_power
n = BigDecimal("10")
assert_equal(n.power(0), BigDecimal("1"))
assert_equal(n.power(1), n)
assert_equal(n.power(2), BigDecimal("100"))
assert_equal(n.power(-1), BigDecimal("0.1"))
assert_raises(TypeError) { n.power(1.1) }
end
def test_big_decimal_mode
# Accept valid arguments to #mode
assert BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW)
assert BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW,true)
assert BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW,false)
# Reject invalid arguments to #mode
assert_raises(TypeError) { BigDecimal.mode(true) } # first argument must be a Fixnum
assert_raises(TypeError) { BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, 1) } # second argument must be [true|false]
assert_raises(TypeError) { BigDecimal.mode(512) } # first argument must be == 256, or return non-zero when AND-ed with 255
# exception mode defaults to 0
assert_equal 0, BigDecimal.mode(1) # value of first argument doesn't matter when retrieving the current exception mode, as long as it's a Fixnum <= 255
# set and clear a single exception mode
assert_equal BigDecimal::EXCEPTION_INFINITY, BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, true)
assert_equal 0, BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
assert_equal BigDecimal::EXCEPTION_NaN, BigDecimal.mode(BigDecimal::EXCEPTION_NaN, true)
assert_equal 0, BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false)
# set a composition of exception modes separately, make sure the final result is the composited value
BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, true)
BigDecimal.mode(BigDecimal::EXCEPTION_NaN, true)
assert_equal BigDecimal::EXCEPTION_INFINITY | BigDecimal::EXCEPTION_NaN, BigDecimal.mode(1)
# reset the exception mode to 0 for the following tests
BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false)
# set a composition of exception modes with one call and retrieve it using the retrieval idiom
# note: this is to check compatibility with MRI, which currently sets only the last mode
# it checks for
BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY | BigDecimal::EXCEPTION_NaN, true)
assert_equal BigDecimal::EXCEPTION_NaN, BigDecimal.mode(1)
# rounding mode defaults to BigDecimal::ROUND_HALF_UP
assert_equal BigDecimal::ROUND_HALF_UP, BigDecimal.mode(BigDecimal::ROUND_MODE)
# make sure each setting complete replaces any previous setting
[BigDecimal::ROUND_UP, BigDecimal::ROUND_DOWN, BigDecimal::ROUND_CEILING, BigDecimal::ROUND_FLOOR,
BigDecimal::ROUND_HALF_UP, BigDecimal::ROUND_HALF_DOWN, BigDecimal::ROUND_HALF_EVEN].each do |mode|
assert_equal mode, BigDecimal.mode(BigDecimal::ROUND_MODE, mode)
end
# reset rounding mode to 0 for following tests
BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_HALF_UP)
assert_raises(TypeError) { BigDecimal.mode(BigDecimal::ROUND_MODE, true) } # second argument must be a Fixnum
assert_raises(TypeError) { BigDecimal.mode(BigDecimal::ROUND_MODE, 8) } # any Fixnum >= 8 should trigger this error, as the valid rounding modes are currently [0..6]
end
def test_marshaling
f = 123.456
bd = BigDecimal.new(f.to_s)
bd_serialized = Marshal.dump(bd)
assert_equal f, Marshal.restore(bd_serialized).to_f
end
#JRUBY-2272
def test_marshal_regression
assert_equal BigDecimal('0.0'), Marshal.load(Marshal.dump(BigDecimal.new('0.0')))
end
end