1 files changed, 43 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 2da2ae95e6..98b1d7b074 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1266,6 +1266,49 @@ class TestIO < Test::Unit::TestCase
     f.close
   end
 
+  def try_fdopen(fd, autoclose = true, level = 100)
+    if level > 0
+      try_fdopen(fd, autoclose, level - 1)
+      GC.start
+      level
+    else
+      IO.for_fd(fd, autoclose: autoclose)
+      nil
+    end
+  end
+
+  def test_autoclose
+    feature2250 = '[ruby-core:26222]'
+    pre = 'ft2250'
+
+    Tempfile.new(pre) do |t|
+      f = IO.for_fd(t.fileno)
+      assert_equal(true, f.autoclose?)
+      f.autoclose = false
+      assert_equal(false, f.autoclose?)
+      f.close
+      assert_nothing_raised(Errno::EBADF) {t.close}
+
+      t.open
+      f = IO.for_fd(t.fileno, autoclose: false)
+      assert_equal(false, f.autoclose?)
+      f.autoclose = true
+      assert_equal(true, f.autoclose?)
+      f.close
+      assert_raise(Errno::EBADF) {t.close}
+    end
+
+    Tempfile.new(pre) do |t|
+      try_fdopen(t.fileno)
+      assert_raise(Errno::EBADF) {t.close}
+    end
+
+    Tempfile.new(pre) do |t|
+      try_fdopen(f.fileno, false)
+      assert_nothing_raised(Errno::EBADF) {t.close}
+    end
+  end
+
   def test_open_redirect
     o = Object.new
     def o.to_open; self; end