test262/src/async-generators/yield-star-getiter-sync-returns-undefined-throw.case

// Copyright 2017 Tooru Fujisawa. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
template: default
desc: Non object returned by [Symbol.iterator]() - undefined
info: |
    YieldExpression: yield * AssignmentExpression

    1. Let exprRef be the result of evaluating AssignmentExpression.
    2. Let value be ? GetValue(exprRef).
    3. Let generatorKind be ! GetGeneratorKind().
    4. Let iterator be ? GetIterator(value, generatorKind).
    ...

    GetIterator ( obj [ , hint ] )

    ...
    3. If hint is async,
      a. Set method to ? GetMethod(obj, @@asyncIterator).
        i. Let syncMethod be ? GetMethod(obj, @@iterator).
        ii. Let syncIterator be ? Call(syncMethod, obj).
        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
    ...

    CreateAsyncFromSyncIterator(syncIterator)

    1. If Type(syncIterator) is not Object, throw a TypeError exception.
    ...

flags: [async]
features: [Symbol.iterator]
---*/

//- setup
var obj = {
  [Symbol.iterator]() {
    return undefined;
  }
};

//- body
  yield* obj;
  throw new Test262Error('abrupt completion closes iter');

//- assertions
iter.next().then(() => {
  throw new Test262Error('Promise incorrectly fulfilled.');
}, v => {
  assert.sameValue(v.constructor, TypeError, "TypeError");

  iter.next().then(({ done, value }) => {
    assert.sameValue(done, true, 'the iterator is completed');
    assert.sameValue(value, undefined, 'value is undefined');
  }).then($DONE, $DONE);
}).catch($DONE);