test262/test/built-ins/GeneratorFunction/invoked-as-function-single-argument.js

// Copyright (C) 2013 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 25.2
description: >
    When invoked via the function invocation pattern with a single argument,
    the GeneratorFunction intrinsic creates a valid generator whose body is the
    first argument evaluated as source code.
features: [generators]
---*/

var GeneratorFunction = Object.getPrototypeOf(function* () {}).constructor;

var g = GeneratorFunction('yield 1;');
var iter = g();
var result;

result = iter.next();
assert.sameValue(result.value, 1, 'First result `value`');
assert.sameValue(result.done, false, 'First result `done` flag');

result = iter.next();
assert.sameValue(result.value, undefined, 'Final result `value`');
assert.sameValue(result.done, true, 'Final result `done` flag');