| // Copyright 2018 Valerie Young. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-asyncgenerator-prototype-throw |
| description: throw() results in rejected promise when called on completed iterator |
| info: | |
| AsyncGenerator.prototype.throw ( exception ) |
| 1. Let generator be the this value. |
| 2. Let completion be Completion{[[Type]]: throw, [[Value]]: exception, [[Target]]: empty}. |
| 3. Return ! AsyncGeneratorEnqueue(generator, completion). |
| |
| AsyncGeneratorEnqueue ( generator, completion ) |
| ... |
| 8. If state is not "executing", then |
| a. Perform ! AsyncGeneratorResumeNext(generator). |
| ... |
| |
| AsyncGeneratorResumeNext: |
| If completion.[[Type]] is throw, and generator.[[AsyncGeneratorState]] is |
| "completed", the resulting promise is rejected with the error. |
| flags: [async] |
| features: [async-iteration] |
| ---*/ |
| |
| var throwError = new Error('Catch me'); |
| var g = async function*() {}; |
| |
| var iter = g(); |
| iter.next().then(function(result) { |
| assert.sameValue(result.value, undefined); |
| assert.sameValue(result.done, true); |
| |
| iter.throw(throwError).then($DONE, function(err) { |
| assert.sameValue(err, throwError) |
| }).then($DONE, $DONE); |
| |
| }).catch($DONE); |