[ruby/bigdecimal] Add Complex#to_d

https://github.com/ruby/bigdecimal/commit/97e794ac97

1 files changed, 12 insertions, 0 deletions

diff --git a/test/bigdecimal/test_bigdecimal_util.rb b/test/bigdecimal/test_bigdecimal_util.rb
index b963fcdeeb..c4d5816987 100644
--- a/test/bigdecimal/test_bigdecimal_util.rb
+++ b/test/bigdecimal/test_bigdecimal_util.rb
@@ -60,6 +60,18 @@ class TestBigDecimalUtil < Test::Unit::TestCase
     assert_raise(ArgumentError) { 355.quo(113).to_d(-42) }
   end
 
+  def test_Complex_to_d
+    assert_equal(BigDecimal("1"), Complex(1, 0).to_d)
+    assert_equal(BigDecimal("0.333333333333333333333"),
+                 Complex(1.quo(3), 0).to_d(21))
+    assert_equal(BigDecimal("0.1234567"), Complex(0.1234567, 0).to_d)
+    assert_equal(BigDecimal("0.1235"), Complex(0.1234567, 0).to_d(4))
+
+    assert_raise_with_message(ArgumentError, "can't omit precision for a Rational.") { Complex(1.quo(3), 0).to_d }
+
+    assert_raise_with_message(ArgumentError, "Unable to make a BigDecimal from non-zero imaginary number") { Complex(1, 1).to_d }
+  end
+
   def test_String_to_d
     assert_equal(BigDecimal('1'), "1__1_1".to_d)
     assert_equal(BigDecimal('2.5'), "2.5".to_d)