* ext/bigdecimal/lib/bigdecimal/util.rb (Float#to_d): modified for

  specifying precision.  fixes #5098.  [ruby-dev:44210]
* test/bigdecimal/test_bigdecimal_util.rb: add test for the above
  change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32679 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/test/bigdecimal/test_bigdecimal_util.rb b/test/bigdecimal/test_bigdecimal_util.rb
index 5f03b734cf..87b4f20e99 100644
--- a/test/bigdecimal/test_bigdecimal_util.rb
+++ b/test/bigdecimal/test_bigdecimal_util.rb
@@ -12,4 +12,17 @@ class TestBigDecimalUtil < Test::Unit::TestCase
     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
 end