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// Copyright 2018-2022 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";  });});