src/third_party/mozjs-45/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor2.js

/*
 * Call the trap with the handler as the this value, the target as the first
 * argument, and the name of the property as the second argument
 */
var target = {};
var called;
var handler = {
    getOwnPropertyDescriptor: function (target1, name) {
        assertEq(this, handler);
        assertEq(target1, target);
        assertEq(name, 'foo');
        called = true;
    }
};

for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy]) {
    called = false;
    Object.getOwnPropertyDescriptor(p, 'foo');
    assertEq(called, true);
}