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add tests for tc39/proposal-iterator-helpers#281 (#3869) 

Co-authored-by: Ms2ger <Ms2ger@igalia.com>
This commit is contained in:
Michael Ficarra 2023-07-13 16:04:33 +02:00 committed by GitHub
parent 20e442011c
commit 550c11163e
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2 changed files with 15 additions and 0 deletions
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14
test/built-ins/Iterator/from/iterable-primitives.js
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@ -37,3 +37,17 @@ assert.throws(TypeError, function () {
assert.compareArray(Array.from(Iterator.from(new Number(5))), [0, 1, 2, 3, 4]); assert.compareArray(Array.from(Iterator.from(new Number(5))), [0, 1, 2, 3, 4]);
assert.compareArray(Array.from(Iterator.from('string')), ['s', 't', 'r', 'i', 'n', 'g']); assert.compareArray(Array.from(Iterator.from('string')), ['s', 't', 'r', 'i', 'n', 'g']);
const originalStringIterator = String.prototype[Symbol.iterator];
let observedType;
Object.defineProperty(String.prototype, Symbol.iterator, {
get() {
'use strict';
observedType = typeof this;
return originalStringIterator;
}
});
Iterator.from('');
assert.sameValue(observedType, 'string');
Iterator.from(new String(''));
assert.sameValue(observedType, 'object');

1
test/built-ins/Iterator/from/supports-iterable.js
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@ -12,3 +12,4 @@ features: [iterator-helpers]
flags: [] flags: []
---*/ ---*/
assert.compareArray(Array.from(Iterator.from([0, 1, 2, 3])), [0, 1, 2, 3]); assert.compareArray(Array.from(Iterator.from([0, 1, 2, 3])), [0, 1, 2, 3]);
assert.compareArray(Array.from(Iterator.from(new String('str'))), ['s', 't', 'r']);