What is the test for an aider and abettor to be found guilty of a charge of perverting the course of justice?

"When the definition of the offense includes the intent to do some act or achieve some consequence beyond the actus reus of the crime [citation], the aider and abettor must share the specific intent of the perpetrator." (People v. Beeman, supra, 35 Cal.3d at p. 560.) "[A]n aider and abettor will 'share' the perpetrator's specific intent when he or she 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." (Ibid.)