What is the test for ineffective assistance of counsel?

"The standards for ineffective assistance of counsel claims are well established. 'We presume that counsel rendered adequate assistance and exercised reasonable professional judgment in making significant trial decisions.' [Citation.] To establish a meritorious claim of ineffective assistance, defendant 'must establish either: (1) As a result of counsel's performance, the prosecution's case was not subjected to meaningful adversarial testing, in which case there is a presumption that the result is unreliable and prejudice need not be affirmatively shown [citations] or (2) counsel's performance fell below an objective standard of reasonableness under prevailing professional norms, and there is a reasonable probability that, but for counsel's unprofessional errors . . . or omissions, the trial would have resulted in a more favorable outcome.' " (People v. Prieto (2003) 30 Cal.4th 226, 261 (Prieto).)