yield-promise-reject-next-for-await-of-async-iterator.js (1400B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/async-generators/yield-promise-reject-next-for-await-of-async-iterator.case 4 // - src/async-generators/default/async-expression.template 5 /*--- 6 description: yield * [Promise.reject(value)] is treated as throw value (Unnamed async generator expression) 7 esid: prod-AsyncGeneratorExpression 8 features: [async-iteration] 9 flags: [generated, async] 10 info: | 11 Async Generator Function Definitions 12 13 AsyncGeneratorExpression : 14 async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) { 15 AsyncGeneratorBody } 16 17 ---*/ 18 let error = new Error(); 19 async function * readFile() { 20 yield Promise.reject(error); 21 yield "unreachable"; 22 } 23 24 25 var callCount = 0; 26 27 var gen = async function *() { 28 callCount += 1; 29 for await (let line of readFile()) { 30 yield line; 31 } 32 }; 33 34 var iter = gen(); 35 36 iter.next().then(() => { 37 throw new Test262Error("Promise incorrectly resolved."); 38 }, rejectValue => { 39 40 // yield Promise.reject(error); 41 assert.sameValue(rejectValue, error); 42 43 iter.next().then(({done, value}) => { 44 // iter is closed now. 45 assert.sameValue(done, true, "The value of IteratorResult.done is `true`"); 46 assert.sameValue(value, undefined, "The value of IteratorResult.value is `undefined`"); 47 }).then($DONE, $DONE); 48 }).catch($DONE); 49 50 assert.sameValue(callCount, 1);