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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>
76 lines
2.3 KiB
JavaScript
76 lines
2.3 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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Order of user-observable operations on a custom this-value and its instances
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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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function formatPropertyName(propertyKey, objectName = "") {
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switch (typeof propertyKey) {
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case "symbol":
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if (Symbol.keyFor(propertyKey) !== undefined) {
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return `${objectName}[Symbol.for('${Symbol.keyFor(propertyKey)}')]`;
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} else if (propertyKey.description.startsWith('Symbol.')) {
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return `${objectName}[${propertyKey.description}]`;
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} else {
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return `${objectName}[Symbol('${propertyKey.description}')]`
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}
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case "string":
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if (propertyKey !== String(Number(propertyKey)))
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return objectName ? `${objectName}.${propertyKey}` : propertyKey;
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// fall through
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default:
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// integer or string integer-index
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return `${objectName}[${propertyKey}]`;
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}
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}
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asyncTest(async function () {
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const expectedCalls = [
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"construct MyArray",
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"defineProperty A[0]",
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"defineProperty A[1]",
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"set A.length"
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];
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const actualCalls = [];
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function MyArray(...args) {
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actualCalls.push("construct MyArray");
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return new Proxy(Object.create(null), {
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set(target, key, value) {
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actualCalls.push(`set ${formatPropertyName(key, "A")}`);
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return Reflect.set(target, key, value);
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},
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defineProperty(target, key, descriptor) {
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actualCalls.push(`defineProperty ${formatPropertyName(key, "A")}`);
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return Reflect.defineProperty(target, key, descriptor);
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}
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});
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}
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let result = await Array.fromAsync.call(MyArray, [1, 2]);
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assert.compareArray(expectedCalls, actualCalls, "order of operations for array argument");
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actualCalls.splice(0); // reset
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// Note https://github.com/tc39/proposal-array-from-async/issues/35
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const expectedCallsForArrayLike = [
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"construct MyArray",
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"construct MyArray",
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"defineProperty A[0]",
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"defineProperty A[1]",
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"set A.length"
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];
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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.compareArray(expectedCallsForArrayLike, actualCalls, "order of operations for array-like argument");
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});
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