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delay_test.ts
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delay_test.ts
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// Copyright 2018-2023 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);
});