What is the test for judicial immunity in the context of executive officer immunity?

"As noted above, courts look at the nature of the challenged act which a judge has performed to determine if it is truly judicial and therefore deserving of judicial immunity. So also, in determining whether a person is acting in a quasi-judicial fashion, the courts look at `the nature of the duty performed [to determine] whether it is a judicial actnot the name or classification of the officer who performs it, and many who are properly classified as executive officers are invested with limited judicial powers.' [Citation.]" (Howard v. Drapkin, supra, 222 Cal.App.3d 843, 852-853, fn. omitted.)