function test() {

// [[Set]] -> [[GetOwnProperty]]
var gopd = [];
var p = new Proxy({},
  { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }});
p.foo = 1; p.bar = 1;
return gopd + '' === "foo,bar";
      
}

if (!test())
    throw new Error("Test failed");