What is the test for holding an evidentiary hearing in response to a habeas corpus petition?

An evidentiary hearing must be held in response to an habeas corpus petition only when (1) a right to relief would be established if the allegations were proved; and (2) following a full and fair trial, the state court trier of fact did not reliably find the relevant facts. ⁸ Townsend v. Sain, 372 U.S. 293, 312-13, 83 S.Ct. 745, 747 (1963); Van Pilon v. Reed, 799 F.2d 1332, 1337-38 (9th Cir.1986).