diff options
Diffstat (limited to 'js/src/tests/non262/AsyncIterator/prototype/lazy-methods-mutate-iterator.js')
-rw-r--r-- | js/src/tests/non262/AsyncIterator/prototype/lazy-methods-mutate-iterator.js | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-mutate-iterator.js b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-mutate-iterator.js new file mode 100644 index 0000000000..876990d945 --- /dev/null +++ b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-mutate-iterator.js @@ -0,0 +1,49 @@ +// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator')) +// +// + +/*--- +esid: pending +description: %AsyncIterator.prototype% methods work properly if the iterator has been mutated. +info: > + Iterator Helpers proposal 2.1.6 +features: [iterator-helpers] +---*/ + +class TestIterator extends AsyncIterator { + values = [1, 2]; + async next() { + if (this.values.length == 0) + return {done: true}; + return {done: false, value: this.values.shift()}; + } +} + +function check({done, value}, expectedDone, expectedValue) { + assertEq(done, expectedDone); + assertEq(Array.isArray(value) ? value[1] : value, expectedValue); +} + +const methods = [ + ['map', x => x], + ['filter', x => true], + ['take', Infinity], + ['drop', 0], + ['asIndexedPairs', undefined], + ['flatMap', async function*(x) { yield x; }], +]; + +for (const [method, arg] of methods) { + (async () => { + const iter = new TestIterator(); + const iterHelper = iter[method](arg); + check(await iterHelper.next(), false, 1); + check(await iterHelper.next(), false, 2); + iter.values.push(3); + check(await iterHelper.next(), false, 3); + check(await iterHelper.next(), true, undefined); + })(); +} + +if (typeof reportCompare == 'function') + reportCompare(0, 0); |