src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case

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

/*---
template: default
desc: Abrupt completion while getting @@iterator after undefined @@asyncIterator
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).
      b. If method is undefined,
        i. Let syncMethod be ? GetMethod(obj, @@iterator).
    ...

    GetMethod ( V, P )

    ...
    2. Let func be ? GetV(V, P).
    ...

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

//- setup
var calls = 0;
var reason = {};
var obj = {
  get [Symbol.iterator]() {
    throw reason;
  },
  get [Symbol.asyncIterator]() {
    calls += 1;
    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, reason, 'reject reason');
  assert.sameValue(calls, 1);

  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);