What is the test for an aider and abettor of an attempted murder charge?

of attempted murder as an aider an abetter.¹ To be an aider and abettor, the defendant must have acted "with knowledge of the criminal purpose of the perpetrator and with an intent or purpose either of committing, or of encouraging or facilitating commission of, the offense." (People v. Beeman (1984) 35 Cal.3d 547, 560, italics omitted.) "When the offense charged is a specific intent crime, the accomplice must 'share the specific intent of the perpetrator'; this occurs when the accomplice 'knows the full extent of the perpetrator's criminal purpose and gives aid or encouragement with the intent or purpose of facilitating the perpetrator's commission of the crime.' "² (People v. Prettyman (1996) 14 Cal.4th 248, 259.)