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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 + 1)
assert_in_delta(BigDecimal(0.5, Float::DIG+1), 0.5.to_d, delta)
assert_in_delta(BigDecimal(355.0/113.0, Float::DIG+1), (355.0/113.0).to_d, delta)
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)
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_equal(355.quo(113).to_d, 355.quo(113).to_d(BigDecimal.double_fig*2+1))
end
def test_Rational_to_d_with_negative_precision
assert_raise(ArgumentError) { 355.quo(113).to_d(-42) }
end
end
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