1 files changed, 8 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 0c8beb2f95..989c4c8991 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1441,6 +1441,14 @@ class TestIO < Test::Unit::TestCase
     End
   end
 
+  def test_dup_timeout
+    with_pipe do |r, w|
+      r.timeout = 0.1
+      r2 = r.dup
+      assert_equal(0.1, r2.timeout)
+    end
+  end
+
   def test_inspect
     with_pipe do |r, w|
       assert_match(/^#<IO:fd \d+>$/, r.inspect)