What is the test for a showing of good cause in a motion for a continuance?

"A showing of good cause requires a demonstration that counsel and the defendant have prepared for trial with due diligence. [Citations.] When a continuance is sought to secure the attendance of a witness, the defendant must establish 'he had exercised due diligence to secure the witness's attendance, that the witness's expected testimony was material and not cumulative, that the testimony could be obtained within a reasonable time, and that the facts to which the witness would testify could not otherwise be proven.' " (People v. Jenkins (2000) 22 Cal.4th 900, 1037 (Jenkins).)