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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 ``` ``````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_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 ``````