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deferred_test.ts
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deferred_test.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import {
assertEquals,
assertRejects,
assertThrows,
} from "../testing/asserts.ts";
import { deferred } from "./deferred.ts";
Deno.test("[async] deferred: resolve", async function () {
const d = deferred<string>();
assertEquals(d.state, "pending");
d.resolve("🦕");
assertEquals(await d, "🦕");
assertEquals(d.state, "fulfilled");
});
Deno.test("[async] deferred: reject", async function () {
const d = deferred<number>();
assertEquals(d.state, "pending");
d.reject(new Error("A deno error 🦕"));
await assertRejects(async () => {
await d;
});
assertEquals(d.state, "rejected");
});
Deno.test("[async] deferred: state with promised value", async function () {
const d = deferred<string>();
const e = deferred<string>();
assertEquals(d.state, "pending");
d.resolve(e);
assertEquals(d.state, "pending");
e.resolve("🦕");
assertEquals(await d, "🦕");
assertEquals(d.state, "fulfilled");
});
Deno.test("[async] deferred: state is readonly", () => {
const d = deferred<string>();
assertEquals(d.state, "pending");
assertThrows(() => {
(d.state as unknown) = "fulfilled";
});
});