1 files changed, 26 insertions, 0 deletions
diff --git a/test/io/nonblock/test_flush.rb b/test/io/nonblock/test_flush.rb
new file mode 100644
index 0000000000..dbe20722cf
--- /dev/null
+++ b/test/io/nonblock/test_flush.rb
@@ -0,0 +1,26 @@
+require 'test/unit'
+require 'io/nonblock'
+
+class TestIONonblock < Test::Unit::TestCase
+  def test_flush                # [ruby-dev:24985]
+    r,w = IO.pipe
+    w.nonblock = true
+    w.sync = false
+    w << "b"
+    w.flush
+    w << "a" * 4096
+    Thread.new {
+      Thread.pass
+      w.close
+    }
+    result = ""
+    t = Thread.new {
+      while (Thread.pass; s = r.read(4096))
+        result << s
+      end
+    }
+    assert_raise(IOError) {w.flush}
+    t.join
+    assert_equal("b", result)
+  end
+end