JSTests/test262/test/language/expressions/generators/yield-as-statement.js

// Copyright (C) 2013 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
  description: >
      `yield` is a valid statement within generator function bodies.
  es6id: 14.4
 ---*/

var iter, result;
var g1 = function*() { yield; };
var g2 = function*() { yield 1; };

iter = g1();
result = iter.next();
assert.sameValue(
  result.value, undefined, 'Without right-hand-side: first result `value`'
);
assert.sameValue(
  result.done, false, 'Without right-hand-side: first result `done` flag'
);
result = iter.next();
assert.sameValue(
  result.value, undefined, 'Without right-hand-side: second result `value`'
);
assert.sameValue(
  result.done, true, 'Without right-hand-eside: second result `done` flag'
);

iter = g2();
result = iter.next();
assert.sameValue(
  result.value, 1, 'With right-hand-side: first result `value`'
);
assert.sameValue(
  result.done, false, 'With right-hand-side: first result `done` flag'
);
result = iter.next();
assert.sameValue(
  result.value, undefined, 'With right-hand-side: second result `value`'
);
assert.sameValue(
  result.done, true, 'With right-hand-eside: second result `done` flag'
);