def testAppend (self):
self.assertEquals (List (1), Nil.append (1))
self.assertEquals (List (1, 2, 3, 4), List (1, 2).append (3, 4))
self.assertEquals (List (1, 2), List (1, 2).append ())
self.assertEquals (List (1, 2, 3), List (1, 2) << 3)
pass
