JSTests/es6/generators_%GeneratorPrototype%.return.js

function test() {

function * generator(){
  yield 5; yield 6;
};
var iterator = generator();
var item = iterator.next();
var passed = item.value === 5 && item.done === false;
item = iterator.return("quxquux");
passed    &= item.value === "quxquux" && item.done === true;
item = iterator.next();
passed    &= item.value === undefined && item.done === true;
return passed;
      
}

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