What is the test for a client's right to representation that is free from conflicts of interest?

"Included in the right to effective assistance of counsel is 'a correlative right to representation that is free from conflicts of interest.' [Citations.]" (People v. Bonin (1989) 47 Cal.3d 808, 834, 254 Cal.Rptr. 298, 765 P.2d 460.) As a general proposition, such conflicts "embrace all situations in which an attorney's loyalty to, or efforts on behalf of, a client are threatened by his responsibilities to another client or a third person or his own interests. [Citation.]" (Id., at p. 835, 254 Cal.Rptr. 298, 765 P.2d 460.)