What is the test for a claim of ineffective assistance of counsel?

defendant's procedural vehicle for bringing to the trial court's attention a claim of ineffective assistance of counsel. [Citation.] The general rule concerning appellate claims of ineffective assistance is that often the alleged deficiency of counsel is not shown by the record on appeal; such cases do not lead to reversal of the judgment on appeal; rather the defendant is relegated to the remedy of habeas corpus, wherein the defendant can bring forth evidence outside the record on appeal. [Citation.]" (People v. Bills, supra, 38 Cal.App.4th at p. 962.)