def testDrop (self):
self.assertEquals (Nil, Nil.drop (3))
self.assertEquals (Nil, List (1, 2, 3).drop (3))
self.assertEquals (List (4, 5), List (1, 2, 3, 4, 5).drop (3))
self.assertEquals (List (1, 2, 3), List (1, 2, 3).drop (0))
pass
