JSTests/es6/Proxy_has_handler_instances_of_proxies.js

function test() {

var proxied = {};
var passed = false;
"foo" in Object.create(new Proxy(proxied, {
  has: function (t, k) {
    passed = t === proxied && k === "foo";
  }
}));
return passed;
      
}

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