--- py3k-subprocess2-unittest/Lib/test/test_subprocess.py	2010-12-11 14:49:53.000000000 +0200
+++ py3k-subprocess2-unittest2/Lib/test/test_subprocess.py	2010-12-11 16:03:29.000000000 +0200
@@ -1044,6 +1044,32 @@
         self.assertTrue(readfiles, "The child hung")
         self.assertEqual(p2.stdout.read(), data)
 
+    def test_close_fds(self):
+        fd_status = support.findfile("fd_status.py", subdir="subprocessdata")
+
+        fds = os.pipe()
+        self.addCleanup(os.close, fds[0])
+        self.addCleanup(os.close, fds[1])
+
+        open_fds = set(fds)
+
+        p = subprocess.Popen([sys.executable, fd_status], 
+                             stdout=subprocess.PIPE, close_fds=False)
+        output, ignored = p.communicate()
+        remaining_fds = set(map(int, output.split(b',')))
+
+        self.assertEqual(remaining_fds & open_fds, open_fds, 
+                         "Some fds were closed")
+
+        p = subprocess.Popen([sys.executable, fd_status], 
+                             stdout=subprocess.PIPE, close_fds=True)
+        output, ignored = p.communicate()
+        remaining_fds = set(map(int, output.split(b',')))
+
+        self.assertFalse(remaining_fds & open_fds,
+                         "Some fds were left open")
+        self.assertIn(1, remaining_fds, "Subprocess failed")
+
 
 @unittest.skipUnless(mswindows, "Windows specific tests")
 class Win32ProcessTestCase(BaseTestCase):