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-rw-r--r--test/bigdecimal/test_bigdecimal_util.rb15
1 files changed, 15 insertions, 0 deletions
diff --git a/test/bigdecimal/test_bigdecimal_util.rb b/test/bigdecimal/test_bigdecimal_util.rb
index 87b4f20e99..72342b922f 100644
--- a/test/bigdecimal/test_bigdecimal_util.rb
+++ b/test/bigdecimal/test_bigdecimal_util.rb
@@ -25,4 +25,19 @@ class TestBigDecimalUtil < Test::Unit::TestCase
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