mirror of https://github.com/denoland/deno.git
45 lines
1.3 KiB
TypeScript
45 lines
1.3 KiB
TypeScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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import { delay } from "./delay.ts";
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import { pooledMap } from "./pool.ts";
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import {
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assert,
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assertEquals,
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assertStringIncludes,
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assertThrowsAsync,
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} from "../testing/asserts.ts";
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Deno.test("[async] pooledMap", async function (): Promise<void> {
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const start = new Date();
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const results = pooledMap(
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2,
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[1, 2, 3],
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(i) => new Promise((r) => setTimeout(() => r(i), 1000)),
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);
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for await (const value of results) {
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console.log(value);
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}
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const diff = new Date().getTime() - start.getTime();
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assert(diff >= 2000);
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assert(diff < 3000);
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});
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Deno.test("[async] pooledMap errors", async function (): Promise<void> {
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async function mapNumber(n: number): Promise<number> {
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if (n <= 2) {
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throw new Error(`Bad number: ${n}`);
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}
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await delay(100);
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return n;
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}
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const mappedNumbers: number[] = [];
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const error = await assertThrowsAsync(async () => {
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for await (const m of pooledMap(3, [1, 2, 3, 4], mapNumber)) {
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mappedNumbers.push(m);
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}
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}, AggregateError) as AggregateError;
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assertEquals(mappedNumbers, [3]);
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assertEquals(error.errors.length, 2);
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assertStringIncludes(error.errors[0].stack, "Error: Bad number: 1");
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assertStringIncludes(error.errors[1].stack, "Error: Bad number: 2");
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});
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