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Diffstat (limited to '')
-rw-r--r-- | js/src/tests/non262/AsyncIterator/prototype/lazy-methods-interleaved.js | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-interleaved.js b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-interleaved.js new file mode 100644 index 0000000000..98c2a2b680 --- /dev/null +++ b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-interleaved.js @@ -0,0 +1,59 @@ +// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator')) + +// +// +/*--- +esid: pending +description: Lazy %AsyncIterator.prototype% method calls can be interleaved. +info: > + Iterator Helpers proposal 2.1.6 +features: [iterator-helpers] +---*/ + +class TestIterator extends AsyncIterator { + value = 0; + async next() { + return {done: false, value: this.value++}; + } +} + +function unwrapResult(value) { + // Unwrap the asIndexedPair return values. + while (Array.isArray(value)) { + value = value[1]; + } + return value; +} + +function check({done, value}, expectedDone, expectedValue) { + assertEq(done, expectedDone); + assertEq(unwrapResult(value), expectedValue); +} + +const methods = [ + ['map', x => x], + ['filter', x => true], + ['take', Infinity], + ['drop', 0], + ['asIndexedPairs', undefined], + ['flatMap', async function*(x) { yield x; }], +]; + +(async () => { + for (const [firstMethod, firstArg] of methods) { + for (const [secondMethod, secondArg] of methods) { + const iterator = new TestIterator(); + + const firstHelper = iterator[firstMethod](firstArg); + const secondHelper = iterator[secondMethod](secondArg); + + check(await firstHelper.next(), false, 0); + check(await secondHelper.next(), false, 1); + check(await firstHelper.next(), false, 2); + check(await secondHelper.next(), false, 3); + } + } +})(); + +if (typeof reportCompare == 'function') + reportCompare(0, 0); |