What is the test for validly waiving the Miranda rights?

^10. The case appellant cites to support his argument that he did not validly waive his rights is simply inapposite and does not merit detailed discussion. (See People v. Diaz (1983) 140 Cal.App.3d 813, 819, 820-821 ["Appellant's response [when asked if he understood his rights], 'No, the only thing I have to tell you is the same thing I already told you before ... then if you want to get me an attorney hardly reflects a comprehension of one's Miranda rights."].)