1require_relative "testbase" 2 3require 'bigdecimal/util' 4 5class TestBigDecimalUtil < Test::Unit::TestCase 6 def test_BigDecimal_to_d 7 x = BigDecimal(1) 8 assert_same(x, x.to_d) 9 end 10 11 def test_Integer_to_d 12 assert_equal(BigDecimal(1), 1.to_d) 13 assert_equal(BigDecimal(2<<100), (2<<100).to_d) 14 end 15 16 def test_Float_to_d_without_precision 17 delta = 1.0/10**(Float::DIG + 1) 18 assert_in_delta(BigDecimal(0.5, Float::DIG+1), 0.5.to_d, delta) 19 assert_in_delta(BigDecimal(355.0/113.0, Float::DIG+1), (355.0/113.0).to_d, delta) 20 end 21 22 def test_Float_to_d_with_precision 23 digits = 5 24 delta = 1.0/10**(digits) 25 assert_in_delta(BigDecimal(0.5, 5), 0.5.to_d(digits), delta) 26 assert_in_delta(BigDecimal(355.0/113.0, 5), (355.0/113.0).to_d(digits), delta) 27 end 28 29 def test_Rational_to_d 30 digits = 100 31 delta = 1.0/10**(digits) 32 assert_in_delta(BigDecimal(1.quo(2), digits), 1.quo(2).to_d(digits), delta) 33 assert_in_delta(BigDecimal(355.quo(113), digits), 355.quo(113).to_d(digits), delta) 34 end 35 36 def test_Rational_to_d_with_zero_precision 37 assert_raise(ArgumentError) { 355.quo(113).to_d(0) } 38 end 39 40 def test_Rational_to_d_with_negative_precision 41 assert_raise(ArgumentError) { 355.quo(113).to_d(-42) } 42 end 43end 44