1 files changed, 50 insertions, 0 deletions
diff --git a/jni/ruby/test/bigdecimal/test_bigdecimal_util.rb b/jni/ruby/test/bigdecimal/test_bigdecimal_util.rb
new file mode 100644
index 0000000..e4d6400
--- /dev/null
+++ b/jni/ruby/test/bigdecimal/test_bigdecimal_util.rb
@@ -0,0 +1,50 @@
+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)
+    assert_in_delta(BigDecimal(0.5, Float::DIG), 0.5.to_d, delta)
+    assert_in_delta(BigDecimal(355.0/113.0, Float::DIG), (355.0/113.0).to_d, delta)
+    assert_equal(9.05.to_d.to_s('F'), "9.05")
+
+    bug9214 = '[ruby-core:58858]'
+    assert_equal((-0.0).to_d.sign, -1, bug9214)
+  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)
+
+    bug9214 = '[ruby-core:58858]'
+    assert_equal((-0.0).to_d(digits).sign, -1, bug9214)
+  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