What is the test for a "aider and abettor" in a murder case?

(1) knowledge of the unlawful purpose of the perpetrator; and (2) the intent or purpose of committing, encouraging, or facilitating the commission of the offense, (3) by act or advice aids, promotes, encourages or instigates, the commission of the crime." (People v. Beeman (1984) 35 Cal.3d 547, 561.) In a murder case, this means that "the aider and abettor must know and share the murderous intent of the actual perpetrator." (People v. McCoy (2001) 25 Cal.4th 1111, 1118.)