What is the test for combining charges of possession of a hypodermic needle with assault by a life prisoner?

Two or more different offenses "connected together in their commission" or "of the same class of crimes or offenses" may be charged and tried together in one case. ( 954.) A court may further consolidate to one or more accusatory pleadings if "filed ... in the same court." ( Id . ) " Offenses of the same class are offenses which possess common characteristics or attributes. " ( People v. Landry (2016) 2 Cal.5th 52, 76 [possession of a weapon while in custody and assault by a life prisoner share common characteristics of offenses in custodial context and prison-made weapons and served same purpose of preventing assault by armed prisoners]; cf. People v. Madden (1988) 206 Cal.App.3d Supp.14, 19 [charges of possession of hypodermic needle and failure to appear have no common characteristics or attributes].)