diff options
Diffstat (limited to 'js/src/tests/non262/Iterator/prototype/lazy-methods-interleaved.js')
-rw-r--r-- | js/src/tests/non262/Iterator/prototype/lazy-methods-interleaved.js | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/prototype/lazy-methods-interleaved.js b/js/src/tests/non262/Iterator/prototype/lazy-methods-interleaved.js new file mode 100644 index 0000000000..9a79ad5fd5 --- /dev/null +++ b/js/src/tests/non262/Iterator/prototype/lazy-methods-interleaved.js @@ -0,0 +1,57 @@ +// |reftest| skip-if(!this.hasOwnProperty('Iterator')) + +// +// +/*--- +esid: pending +description: Lazy %Iterator.prototype% method calls can be interleaved. +info: > + Iterator Helpers proposal 2.1.5 +features: [iterator-helpers] +---*/ + +class TestIterator extends Iterator { + value = 0; + next() { + return {done: false, value: this.value++}; + } +} + +function unwrapResult(result) { + return result; +} + +const methods = [ + iter => iter.map(x => x), + iter => iter.filter(x => true), + iter => iter.take(2), + iter => iter.drop(0), + iter => iter.flatMap(x => [x]), +]; + +for (const firstMethod of methods) { + for (const secondMethod of methods) { + const iterator = new TestIterator(); + const firstHelper = firstMethod(iterator); + const secondHelper = secondMethod(iterator); + + let firstResult = unwrapResult(firstHelper.next()); + assertEq(firstResult.done, false); + assertEq(firstResult.value, 0); + + let secondResult = unwrapResult(secondHelper.next()); + assertEq(secondResult.done, false); + assertEq(secondResult.value, 1); + + firstResult = unwrapResult(firstHelper.next()); + assertEq(firstResult.done, false); + assertEq(firstResult.value, 2); + + secondResult = unwrapResult(secondHelper.next()); + assertEq(secondResult.done, false); + assertEq(secondResult.value, 3); + } +} + +if (typeof reportCompare == 'function') + reportCompare(0, 0); |