index.test.js

// https://developers.cloudflare.com/workers/wrangler/api/#unstable_dev
import { unstable_dev as dev } from "wrangler";
import { test, after, before, describe } from "node:test";
import assert from "node:assert";

/** @type {import("wrangler").UnstableDevWorker} */
describe("CloudFlare Worker", () => {
  let worker;

  before(async () => {
    worker = await dev("./index.js", {
      port: 3000,
      experimental: { disableExperimentalWarning: true },
    });
  });

  after(async () => {
    if (!worker) {
      // If no worker the before hook failed to run and the process will hang.
      process.exit(1);
    }
    await worker.stop();
  });

  test("worker streams back a response", { timeout: 1000 }, async () => {
    const resp = await worker.fetch();
    const text = await resp.text();

    assert.ok(resp.ok, "status is 2xx");
    assert(text.length > 0, "body.length is greater than 0");
    assert(
      text.includes("Colin CloudFlare"),
      "body includes stream characters"
    );
  });
});