What is the test for invalidating a misdemeanor conviction predicated upon a guilty plea?

Since 1973, a misdemeanor conviction, predicated upon a guilty plea, is invalid unless the record explicitly reveals that before the plea was entered, the defendant was made aware of his privilege against self-incrimination, his right to confrontation, and his right to a jury trial, and that he knowingly and intelligently waived each of those rights. (Mills v. Municipal Court (1975), 10 Cal.3d 288, 110 Cal.Rptr. 329, 515 P.2d 273.)