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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { getAvailablePort } from "./get_available_port.ts";import { assertEquals } from "../assert/mod.ts";
/** Helper function to see if a port is indeed available for listening (race-y) */async function testWithPort(port: number) {  const server = Deno.serve({    port,    async onListen() {      const resp = await fetch(`http://localhost:${port}`);      const text = await resp.text();      assertEquals(text, "hello");      server.shutdown();    },  }, () => new Response("hello"));
  await server.finished;}
Deno.test("getAvailablePort() gets an available port", async () => {  const port = getAvailablePort();  await testWithPort(port);});
Deno.test("getAvailablePort() gets an available port with a preferred port", async () => {  const port = getAvailablePort({ preferredPort: 9563 });  await testWithPort(port);});