What is the test for ineffective assistance of counsel on appeal?

To establish ineffective assistance of counsel on appeal, a defendant must demonstrate that: (1) his attorney's performance fell below an objective standard of reasonableness; and (2) there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been more favorable to the defendant. (Strickland v. Washington (1984) 466 U.S. 668, 688, 694.) A reasonable probability is a probability sufficient to undermine confidence in the outcome. (Ibid.)