Merge revisions 32676, 32677, 32679, 32680:

    * ext/bigdecimal/lib/bigdecimal/util.rb (Rational#to_d):
      zero or negative precision is error.  fixes #5098.
      [ruby-dev:44210]
    * ext/bigdecimal/lib/bigdecimal/util.rb (Float#to_d): modified for
      specifying precision.  fixes #5098.  [ruby-dev:44210]
    * ext/bigdecimal/lib/bigdecimal/util.rb (Integer#to_d): added
      for symmetry to BigDecimal() function with an Integer.
      fixes #5098.  [ruby-dev:44210]
    * ext/bigdecimal/lib/bigdecimal/util.rb (BigDecimal#to_d): added
      for adapting other Numeric subclasses.  [ruby-dev:44245]
    * test/bigdecimal/test_bigdecimal_util.rb: add tests for the above
      changes.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@32687 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 43 insertions, 0 deletions

diff --git a/test/bigdecimal/test_bigdecimal_util.rb b/test/bigdecimal/test_bigdecimal_util.rb
new file mode 100644
index 0000000000..72342b922f
--- /dev/null
+++ b/test/bigdecimal/test_bigdecimal_util.rb
@@ -0,0 +1,43 @@
+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