JSTests/es6/Object.prototype.__proto___correct_property_descriptor.js

function test() {

var desc = Object.getOwnPropertyDescriptor(Object.prototype,"__proto__");
var A = function(){};

return (desc
  && "get" in desc
  && "set" in desc
  && desc.configurable
  && !desc.enumerable);
      
}

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