What is the test for determining whether a defendant has a prior conviction for a sexual assault?

^4. "Other than the fact of a prior conviction, any fact that increases the penalty for a crime beyond the prescribed statutory maximum must be submitted to a jury, and proved beyond a reasonable doubt. With that exception, we endorse the statement of the rule set forth in the concurring opinions in that case: 'It is unconstitutional for a legislature to remove from the jury the assessment of facts that increase the prescribed range of penalties to which a criminal defendant is exposed.' " (Apprendi v. New Jersey, supra, 530 U.S. at p. 490 [147 L.Ed.2d at p. 455].)