What is the test for determining whether the evidence at the preliminary hearing supported the finding of probable cause?

This issue is moot. "Where the evidence produced at trial amply supports the jury's finding, any question whether the evidence produced at the preliminary hearing supported the finding of probable cause is rendered moot. Even `"`[i]f there is insufficient evidence to support the commitment, the defendant cannot be said to be prejudiced where sufficient evidence has been introduced at . . . trial'"' to support the jury's finding as to the charge or as to the truth of the allegation. [Citations.]" (People v. Crittenden (1994) 9 Cal.4th 83, 137.)