tor-browser

The Tor Browser
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yield-star-getiter-async-undefined-sync-get-abrupt.js (2161B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case
      4 // - src/async-generators/default/async-class-decl-method.template
      5 /*---
      6 description: Abrupt completion while getting @@iterator after undefined @@asyncIterator (Async Generator method as a ClassDeclaration element)
      7 esid: prod-AsyncGeneratorMethod
      8 features: [Symbol.iterator, Symbol.asyncIterator, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    ClassElement :
     12      MethodDefinition
     13 
     14    MethodDefinition :
     15      AsyncGeneratorMethod
     16 
     17    Async Generator Function Definitions
     18 
     19    AsyncGeneratorMethod :
     20      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
     21 
     22 
     23    YieldExpression: yield * AssignmentExpression
     24 
     25    1. Let exprRef be the result of evaluating AssignmentExpression.
     26    2. Let value be ? GetValue(exprRef).
     27    3. Let generatorKind be ! GetGeneratorKind().
     28    4. Let iterator be ? GetIterator(value, generatorKind).
     29    ...
     30 
     31    GetIterator ( obj [ , hint ] )
     32 
     33    ...
     34    3. If hint is async,
     35      a. Set method to ? GetMethod(obj, @@asyncIterator).
     36      b. If method is undefined,
     37        i. Let syncMethod be ? GetMethod(obj, @@iterator).
     38    ...
     39 
     40    GetMethod ( V, P )
     41 
     42    ...
     43    2. Let func be ? GetV(V, P).
     44    ...
     45 
     46 ---*/
     47 var calls = 0;
     48 var reason = {};
     49 var obj = {
     50  get [Symbol.iterator]() {
     51    throw reason;
     52  },
     53  get [Symbol.asyncIterator]() {
     54    calls += 1;
     55    return undefined;
     56  }
     57 };
     58 
     59 
     60 
     61 var callCount = 0;
     62 
     63 class C { async *gen() {
     64    callCount += 1;
     65    yield* obj;
     66      throw new Test262Error('abrupt completion closes iter');
     67 
     68 }}
     69 
     70 var gen = C.prototype.gen;
     71 
     72 var iter = gen();
     73 
     74 iter.next().then(() => {
     75  throw new Test262Error('Promise incorrectly fulfilled.');
     76 }, v => {
     77  assert.sameValue(v, reason, 'reject reason');
     78  assert.sameValue(calls, 1);
     79 
     80  iter.next().then(({ done, value }) => {
     81    assert.sameValue(done, true, 'the iterator is completed');
     82    assert.sameValue(value, undefined, 'value is undefined');
     83  }).then($DONE, $DONE);
     84 }).catch($DONE);
     85 
     86 assert.sameValue(callCount, 1);