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

difficult, tactical decisions in the harsh light of hindsight' [citation]. 'Tactical errors are generally not deemed reversible, and counsel's decisionmaking must be evaluated in the context of the available facts.' " (People v. Weaver (2001) 26 Cal.4th 876, 925-926.)

"In the usual case, where counsel's trial tactics or strategic reasons for challenged decisions do not appear on the record, we will not find ineffective assistance of counsel on appeal unless there could be no conceivable reason for counsel's acts or omissions." (People v. Weaver, supra, 26 Cal.4th at p. 926.)