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This contains a few more tests for Array.fromAsync, in addition to what has already been merged and what is under review at #3791. This covers the following items from the testing plan at #3725: - Success cases - Creates promise - Create new array/arraylike in promise (with length = length property) - Input - Invalid input values - nonconforming object (arraylike without length, missing keys) - Covered by polyfill tests - Result promise rejects if length access fails (non-iterable input) - Unaffected by globalThis.Symbol mutation (non-iterable) - this-value - this-value is a constructor - this-value is not a constructor - If this is a constructor, and items doesn't have a Symbol.iterator, returns a new instance of this - Iterator closed when property creation on this fails - Returned promise rejects when ^ - Other tests - Error is thrown for all CreateDataProperty fails - Non-writable properties are overwritten by CreateDataProperty - Input with missing values Co-authored-by: Ms2ger <Ms2ger@igalia.com>
54 lines
2.0 KiB
JavaScript
54 lines
2.0 KiB
JavaScript
// Copyright (C) 2023 Igalia, S.L. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-array.fromasync
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description: >
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Constructs the this-value once if asyncItems is iterable, twice if not, and
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length and element properties are set correctly on the result
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info: |
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3.e. If IsConstructor(_C_) is *true*, then
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i. Let _A_ be ? Construct(_C_).
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...
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j. If _iteratorRecord_ is not *undefined*, then
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...
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k. Else,
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...
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iv. If IsConstructor(_C_) is *true*, then
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1. Let _A_ be ? Construct(_C_, « 𝔽(_len_) »).
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includes: [compareArray.js, asyncHelpers.js]
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flags: [async]
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features: [Array.fromAsync]
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---*/
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asyncTest(async function () {
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const constructorCalls = [];
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function MyArray(...args) {
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constructorCalls.push(args);
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}
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let result = await Array.fromAsync.call(MyArray, [1, 2]);
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assert(result instanceof MyArray, "result is an instance of the constructor this-value");
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assert.sameValue(result.length, 2, "length is set on result");
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assert.sameValue(result[0], 1, "element 0 is set on result");
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assert.sameValue(result[1], 2, "element 1 is set on result");
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assert.sameValue(constructorCalls.length, 1, "constructor is called once");
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assert.compareArray(constructorCalls[0], [], "constructor is called with no arguments");
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constructorCalls.splice(0); // reset
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result = await Array.fromAsync.call(MyArray, {
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length: 2,
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0: 1,
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1: 2
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});
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assert(result instanceof MyArray, "result is an instance of the constructor this-value");
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assert.sameValue(result.length, 2, "length is set on result");
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assert.sameValue(result[0], 1, "element 0 is set on result");
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assert.sameValue(result[1], 2, "element 1 is set on result");
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assert.sameValue(constructorCalls.length, 2, "constructor is called twice");
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assert.compareArray(constructorCalls[0], [], "constructor is called first with no arguments");
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assert.compareArray(constructorCalls[1], [2], "constructor is called second with a length argument");
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});
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