def test_del_should_do_no_op_when_key_not_found(self):
lru_cache = LRUCache(3)
lru_cache.put(1, "abc")
lru_cache.put(2, "edf")
lru_cache.put(3, "ghi")
lru_cache.delete(4)
self.assertEqual(lru_cache._get_head_value(), "ghi", "Failed")
def test_del_should_remove_key_value(self):
lru_cache = LRUCache(3)
lru_cache.put(1, "abc")
lru_cache.put(2, "edf")
lru_cache.put(3, "ghi")
#deleting head
lru_cache.delete(3)
self.assertEqual(lru_cache._get_head_key(), 2, "Failed")
self.assertEqual(lru_cache._get_head_value(), "edf", "Failed")
self.assertIsNone(lru_cache.get(3), "Failed")
#deleting tail
lru_cache.put(3, "ghi")
lru_cache.delete(1)
self.assertEqual(lru_cache._get_tail_key(), 2, "Failed")
