1 files changed, 32 insertions, 0 deletions
diff --git a/test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb b/test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb
new file mode 100644
index 0000000000..76ef68002a
--- /dev/null
+++ b/test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb
@@ -0,0 +1,32 @@
+require 'test/unit'
+
+class TestWaitForSingleFD < Test::Unit::TestCase
+  require '-test-/wait_for_single_fd/wait_for_single_fd'
+
+  def with_pipe
+    r, w = IO.pipe
+    begin
+      yield r, w
+    ensure
+      r.close unless r.closed?
+      w.close unless w.closed?
+    end
+  end
+
+  def test_wait_for_valid_fd
+    with_pipe do |r,w|
+      rc = IO.wait_for_single_fd(w.fileno, RB_WAITFD_OUT, nil)
+      assert_equal RB_WAITFD_OUT, rc
+    end
+  end
+
+  def test_wait_for_invalid_fd
+    with_pipe do |r,w|
+      wfd = w.fileno
+      w.close
+      assert_raises(Errno::EBADF) do
+        IO.wait_for_single_fd(wfd, RB_WAITFD_OUT, nil)
+      end
+    end
+  end
+end