What is the test for abuse of discretion when dealing with evidence of prior uncharged acts?

Evidence of prior uncharged acts is inadmissible to prove the defendant's bad character, but may be admitted if relevant to prove motive, opportunity, intent, preparation, plan, knowledge, identity, and absence of mistake or accident, among other facts. (Evid. Code, 1101, subds. (a), (b).) We review the trial court's evidentiary rulings for abuse of discretion. (People v. Smithey (1999) 20 Cal.4th 936, 970; People v. Crittenden (1994) 9 Cal.4th 83, 132.)