* ext/bigdecimal/bigdecimal.c (GetVpValueWithPrec): support instantiation from

  a Float through Rational.
* ext/bigdecimal/bigdecimal.c (BigDecimal_new): ditto.
* test/bigdecimal/test_bigdecimal.rb (test_global_new_float): add a test for
  the above changes.
* test/bigdecimal/test_bigdecimal.rb (test_new_with_float): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31870 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 16 insertions, 0 deletions

diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index 63873d2b7c..c0c5ea44a0 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -42,6 +42,14 @@ class TestBigDecimal < Test::Unit::TestCase
     assert_raise(ArgumentError) { BigDecimal(1.quo(3)) }
   end
 
+  def test_global_new_with_float
+    assert_equal(BigDecimal("0.1235"), BigDecimal(0.1234567, 4))
+    assert_equal(BigDecimal("-0.1235"), BigDecimal(-0.1234567, 4))
+    assert_raise(ArgumentError) { BigDecimal(0.1) }
+    assert_raise(ArgumentError) { BigDecimal(0.1, Float::DIG + 2) }
+    assert_nothing_raised { BigDecimal(0.1, Float::DIG + 1) }
+  end
+
   def test_new
     assert_equal(1, BigDecimal.new("1"))
     assert_equal(1, BigDecimal.new("1", 1))
@@ -70,6 +78,14 @@ class TestBigDecimal < Test::Unit::TestCase
     assert_raise(ArgumentError) { BigDecimal.new(1.quo(3)) }
   end
 
+  def test_new_with_float
+    assert_equal(BigDecimal("0.1235"), BigDecimal(0.1234567, 4))
+    assert_equal(BigDecimal("-0.1235"), BigDecimal(-0.1234567, 4))
+    assert_raise(ArgumentError) { BigDecimal.new(0.1) }
+    assert_raise(ArgumentError) { BigDecimal.new(0.1, Float::DIG + 2) }
+    assert_nothing_raised { BigDecimal.new(0.1, Float::DIG + 1) }
+  end
+
   def _test_mode(type)
     BigDecimal.mode(type, true)
     assert_raise(FloatDomainError) { yield }