test262/test/language/expressions/yield/from-with.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: >
    The operand to a `yield` expression should honor the semantics of the
    `with` statement.
---*/

function* g() {
  var x = 1;

  yield x;

  with ({ x: 2 }) {
    yield x;
  }

  yield x;
}
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, 2, 'Second result `value`');
assert.sameValue(result.done, false, 'Second result `done` flag');

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

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