What is the test for ineffective assistance of counsel?

"'"We review a trial court's ruling on a motion for a new trial under a deferential abuse-of-discretion standard." [Citations.] "'A trial court's ruling on a motion for new trial is so completely within that court's discretion that a reviewing court will not disturb the ruling absent a manifest and unmistakable abuse of that discretion.'"' [Citation.]" (People v. Lightsey (2012) 54 Cal.4th 668, 729.)

"Penal Code section 1181 enumerates nine grounds for ordering a new trial. It is true the section expressly limits the grant of a new trial to only the listed grounds, and ineffective assistance is not among them. Nevertheless, the statute should not be read to limit the constitutional duty of trial courts to ensure that defendants be accorded due process of law. 'Upon the trial judge rests the duty of seeing that the trial is conducted with solicitude for the essential rights of the accused.' [Citations.]" (People v. Fosselman (1983) 33 Cal.3d 572, 582.)

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"There are two components to an ineffective assistance of counsel claim: deficient performance of counsel and prejudice to the petitioner. Strickland v. Washington (1984) 466 U.S. 668, 697, informs us that 'there is no reason for a court deciding an ineffective assistance claim to approach the inquiry in the same order or even to address both components of the inquiry if the defendant makes an insufficient showing on one. In particular, a court need not determine whether counsel's performance was deficient before examining the prejudice suffered by the defendant as a result of the alleged deficiencies. The object of an ineffectiveness claim is not to grade counsel's performance. If it is easier to dispose of an ineffectiveness claim on the ground of lack of sufficient prejudice, which we expect will often be so, that course should be followed.'" (In re Cox (2003) 30 Cal.4th 974, 1019-1020 (Cox).) To establish prejudice, a defendant must show that, "'but for counsel's unprofessional errors and/or omissions, the trial would have resulted in a more favorable outcome.' [Citation.]" (Id. at p. 1016.)