What is the test for sufficiency of evidence in a sexual assault case?

"`When considering a challenge to the sufficiency of the evidence to support a conviction, we review the entire record in the light most favorable to the judgment to determine whether it contains substantial evidencethat is, evidence that is reasonable, credible, and of solid valuefrom which a reasonable trier of fact could find the defendant guilty beyond a reasonable doubt.' [Citation.] `[T]he relevant question is whether, after viewing the evidence in the light most favorable to the prosecution, any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.' [Citations.] `[I]t is the jury, not the appellate court which must be convinced of the defendant's guilt beyond a reasonable doubt.' [Citation.] `In a case, such as the present one, based upon circumstantial evidence, we must decide whether the circumstances reasonably justify the findings of the trier of fact, but our opinion that the circumstances also might reasonably be reconciled with a contrary finding would not warrant reversal of the judgment. [Citation.]' [Citation.]" (People v. Lewis (2009) 46 Cal.4th 1255, 1289-1290.) In deciding whether substantial evidence supports the decision of the trial court, we do not resolve issues of credibility or evidentiary conflicts. (People v. Young (2005) 34 Cal.4th 1149, 1181.) Resolution of conflicting evidence and credibility issues is for the jury to decide. (People v. Martinez (2008) 158 Cal.App.4th 1324, 1331.) "Moreover, unless the testimony is physically impossible or inherently improbable, testimony of a single witness is sufficient . . . ." (Young, at p. 1181.)