What is the test for a motion for a new trial based on newly discovered evidence?

"'"The determination of a motion for a new trial rests so completely within the court's discretion that its action will not be disturbed unless a manifest and unmistakable abuse of discretion clearly appears."' [Citations.] '"[I]n determining whether there has been a proper exercise of discretion on such motion, each case must be judged from its own factual background."' [Citation.] [] In ruling on a motion for new trial based on newly discovered evidence, the trial court considers the following factors: '"1. That the evidence, and not merely its materiality, be newly discovered; 2. That the evidence be not cumulative merely; 3. That it be such as to render a different result probable on a retrial of the cause; 4. That the party could not with reasonable diligence have discovered and produced it at the trial; and 5. That these facts be shown by the best evidence of which the case admits."' [Citations.]" (People v. Delgado (1993) 5 Cal.4th 312, 328.) "In addition, 'the trial court may consider the credibility as well as materiality of the

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evidence in its determination [of] whether introduction of the evidence in a new trial would render a different result reasonably probable.'" (Id. at p. 329.) "A motion for new trial on the ground of newly discovered evidence is looked upon with disfavor. [Citation.] The granting or denial of such a motion is within the sound discretion of the trial court and, absent a clear showing of abuse of discretion, will not be reversed on appeal." (People v. Hernandez (1971) 19 Cal.App.3d 411, 416.)