src/third_party/mozjs-45/js/src/jit-test/tests/collections/Array-of-generic-2.js

// Array.of passes the number of arguments to the constructor it calls.

var hits = 0;
function Herd(n) {
    assertEq(arguments.length, 1);
    assertEq(n, 5);
    hits++;
}
Herd.of = Array.of;
Herd.of("sheep", "cattle", "elephants", "whales", "seals");
assertEq(hits, 1);