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std/async/delay_test.ts

Deno standard library
denoland/deno_std
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { delay } from "./delay.ts";import { assert, assertRejects } from "../testing/asserts.ts";
Deno.test("[async] delay", async function () {  const start = new Date();  const delayedPromise = delay(100);  const result = await delayedPromise;  const diff = new Date().getTime() - start.getTime();  assert(result === undefined);  assert(diff >= 100);});
Deno.test("[async] delay with abort", async function () {  const start = new Date();  const abort = new AbortController();  const { signal } = abort;  const delayedPromise = delay(100, { signal });  setTimeout(() => abort.abort(), 0);  await assertRejects(    () => delayedPromise,    DOMException,    "Delay was aborted",  );
  const diff = new Date().getTime() - start.getTime();  assert(diff < 100);});
Deno.test("[async] delay with non-aborted signal", async function () {  const start = new Date();  const abort = new AbortController();  const { signal } = abort;  const delayedPromise = delay(100, { signal });  // abort.abort()  const result = await delayedPromise;  const diff = new Date().getTime() - start.getTime();  assert(result === undefined);  assert(diff >= 100);});
Deno.test("[async] delay with signal aborted after delay", async function () {  const start = new Date();  const abort = new AbortController();  const { signal } = abort;  const delayedPromise = delay(100, { signal });  const result = await delayedPromise;  abort.abort();  const diff = new Date().getTime() - start.getTime();  assert(result === undefined);  assert(diff >= 100);});
Deno.test("[async] delay with already aborted signal", async function () {  const start = new Date();  const abort = new AbortController();  abort.abort();  const { signal } = abort;  const delayedPromise = delay(100, { signal });  await assertRejects(    () => delayedPromise,    DOMException,    "Delay was aborted",  );
  const diff = new Date().getTime() - start.getTime();  assert(diff < 100);});