What is the legal test used to determine whether a defendant has a valid claim on appeal?

We appointed counsel to represent defendant on appeal. After examination of the record, counsel has filed a brief under the authority of People v. Wende (1979) 25 Cal.3d 436 and Anders v. California (1967) 386 U.S. 738, setting forth a statement of the case, a summary of the facts and potential arguable issues, and requesting this court conduct an independent review of the record.

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We offered defendant an opportunity to file a personal supplemental brief, but he has not done so.