What is the test for determining whether a witness has a bias, interest or other motive in giving testimony?

hearsay declarant, having any tendency in reason to prove or disprove any disputed fact that is of consequence to the determination of the action." (Evid. Code, 210.) Given that a jury may consider "'[t]he existence or nonexistence of a bias, interest, or other motive' for giving . . . testimony" (People v. Price (1991) 1 Cal.4th 324, 422), evidence concerning whether a witness has a bias or motive in testifying is relevant. (Ibid.) The definition of "relevant" in Evidence Code section 210 "includes evidence 'relevant to the credibility of a witness.'" (People v. Contreras (2013) 58 Cal.4th 123, 152.)