1 files changed, 25 insertions, 0 deletions
diff --git a/test/ruby/test_rational.rb b/test/ruby/test_rational.rb
index f8da6da7d6..4cdcb419cb 100644
--- a/test/ruby/test_rational.rb
+++ b/test/ruby/test_rational.rb
@@ -120,7 +120,32 @@ class Rational_Test < Test::Unit::TestCase
     assert_raise_with_message(ArgumentError, /\u{221a 2668}/) {
       Rational("\u{221a 2668}")
     }
+
     assert_raise(TypeError){Rational(Object.new)}
+    assert_raise(TypeError){Rational(Object.new, Object.new)}
+    assert_raise(TypeError){Rational(1, Object.new)}
+
+    o = Object.new
+    def o.to_r; 1/42r; end
+    assert_equal(1/42r, Rational(o))
+    assert_equal(1/84r, Rational(o, 2))
+    assert_equal(42, Rational(1, o))
+    assert_equal(1, Rational(o, o))
+
+    o = Object.new
+    def o.to_r; nil; end
+    assert_raise(TypeError) { Rational(o) }
+    assert_raise(TypeError) { Rational(o, 2) }
+    assert_raise(TypeError) { Rational(1, o) }
+    assert_raise(TypeError) { Rational(o, o) }
+
+    o = Object.new
+    def o.to_r; raise; end
+    assert_raise(RuntimeError) { Rational(o) }
+    assert_raise(RuntimeError) { Rational(o, 2) }
+    assert_raise(RuntimeError) { Rational(1, o) }
+    assert_raise(RuntimeError) { Rational(o, o) }
+
     assert_raise(ArgumentError){Rational()}
     assert_raise(ArgumentError){Rational(1,2,3)}