#11973: add test for previously fixed kevent signed/unsigned bug.

Patch by David Naylor.

Lib/test/test_kqueue.py

@@ -81,6 +81,31 @@ class TestKQueue(unittest.TestCase):
         self.assertEqual(ev, ev)
         self.assertNotEqual(ev, other)
 
+        # Issue 11973
+        bignum = 0xffff
+        ev = select.kevent(0, 1, bignum)
+        self.assertEqual(ev.ident, 0)
+        self.assertEqual(ev.filter, 1)
+        self.assertEqual(ev.flags, bignum)
+        self.assertEqual(ev.fflags, 0)
+        self.assertEqual(ev.data, 0)
+        self.assertEqual(ev.udata, 0)
+        self.assertEqual(ev, ev)
+        self.assertNotEqual(ev, other)
+
+        # Issue 11973
+        bignum = 0xffffffff
+        ev = select.kevent(0, 1, 2, bignum)
+        self.assertEqual(ev.ident, 0)
+        self.assertEqual(ev.filter, 1)
+        self.assertEqual(ev.flags, 2)
+        self.assertEqual(ev.fflags, bignum)
+        self.assertEqual(ev.data, 0)
+        self.assertEqual(ev.udata, 0)
+        self.assertEqual(ev, ev)
+        self.assertNotEqual(ev, other)
+
+
     def test_queue_event(self):
         serverSocket = socket.socket()
         serverSocket.bind(('127.0.0.1', 0))