What is the test for immunity in the context of witness testimony?

2 "No person * * * shall be compelled in any criminal case to be a witness against himself * * *."

Although these cases arise in the context of a federal immunity statute, it seems clear that the validity of a state immunity statute is measured by the same yardstick. See Malloy v. Hogan, 378 U.S. 1, 84 S.Ct. 1489, 12 L.Ed.2d 653 (1964).

Although these cases arise in the context of a federal immunity statute, it seems clear that the validity of a state immunity statute is measured by the same yardstick. See Malloy v. Hogan, 378 U.S. 1, 84 S.Ct. 1489, 12 L.Ed.2d 653 (1964).