What is the test for determining the credibility of a witness?

To evaluate defendant's challenge, we must view the evidence in the light most favorable to uphold the verdict, to determine whether a rational trier of fact could have found the elements beyond a reasonable doubt. (People v. Banks (2015) 61 Cal.4th 788, 804.) " ' "Although we must ensure the evidence is reasonable, credible, and of solid value, nonetheless it is the exclusive province of the trial judge or jury to determine the credibility of a witness and the truth or falsity of the facts on which that determination depends. [Citation.] Thus, if the verdict is supported by substantial evidence, we must accord due deference to the trier of fact and not substitute our evaluation of a witness's credibility for that of the fact finder." ' " (People v. Smith (2005) 37 Cal.4th 733, 739.)

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