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denoland-deno/std/async/deferred_test.ts
2021-01-10 21:59:07 -05:00

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TypeScript

// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertThrowsAsync } from "../testing/asserts.ts";
import { deferred } from "./deferred.ts";
Deno.test("[async] deferred: resolve", async function (): Promise<void> {
const d = deferred<string>();
d.resolve("🦕");
assertEquals(await d, "🦕");
});
Deno.test("[async] deferred: reject", async function (): Promise<void> {
const d = deferred<number>();
d.reject(new Error("A deno error 🦕"));
await assertThrowsAsync(async () => {
await d;
});
});