What is the test for establishing that a judgment is presumed correct on appeal?

"Perhaps the most fundamental rule of appellate law is that the judgment challenged on appeal is presumed correct, and it is the appellant's burden to affirmatively demonstrate error." (People v. Sanghera (2006) 139 Cal.App.4th 1567, 1573.) "The

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very settled rule of appellate review is a trial court's order/judgment is presumed to be correct, error is never presumed, and the appealing party must affirmatively demonstrate error on the face of the record." (People v. Davis (1996) 50 Cal.App.4th 168, 172.)