test(index): keep the server alive during the entire test session

Also, remove use of deprecated code.

test/index.test.ts

@@ -9,38 +9,38 @@ import {
 } from "h3";
 import { Blob } from "fetch-blob";
 import { FormData } from "formdata-polyfill/esm.min.js";
-import { describe, beforeEach, afterEach, it, expect } from "vitest";
+import { describe, beforeAll, afterAll, it, expect } from "vitest";
 import { Headers, $fetch } from "../src/node";
 
 describe("ofetch", () => {
   let listener;
   const getURL = (url) => joinURL(listener.url, url);
 
-  beforeEach(async () => {
+  beforeAll(async () => {
     const app = createApp()
       .use(
         "/ok",
         eventHandler(() => "ok")
       )
       .use(
         "/params",
-        eventHandler((event) => getQuery(event.req.url || ""))
+        eventHandler((event) => getQuery(event.node.req.url || ""))
       )
       .use(
         "/url",
-        eventHandler((event) => event.req.url)
+        eventHandler((event) => event.node.req.url)
       )
       .use(
         "/post",
         eventHandler(async (event) => ({
           body: await readBody(event),
-          headers: event.req.headers,
+          headers: event.node.req.headers,
         }))
       )
       .use(
         "/binary",
         eventHandler((event) => {
-          event.res.setHeader("Content-Type", "application/octet-stream");
+          event.node.res.setHeader("Content-Type", "application/octet-stream");
           return new Blob(["binary"]);
         })
       )
@@ -51,7 +51,7 @@ describe("ofetch", () => {
     listener = await listen(toNodeListener(app));
   });
 
-  afterEach(async () => {
+  afterAll(async () => {
     await listener.close();
   });