refactor: migrate from node:http to Express with Express.js tests

package.json

@@ -6,8 +6,8 @@
   "main": "dist/index.js",
   "scripts": {
     "build": "tsc",
-    "start": "node dist/index.js",
-    "test": "npm run build && node --test dist/index.test.js",
+    "start": "node dist/bin/server.js",
+    "test": "vitest run",
     "lint": "eslint . && tsc --noEmit",
     "format": "prettier --write .",
     "format:check": "prettier --check ."
@@ -15,13 +15,20 @@
   "engines": {
     "node": ">=22"
   },
+  "dependencies": {
+    "express": "^5.2.0"
+  },
   "devDependencies": {
-    "typescript": "^5.6.0",
-    "@types/node": "^22.0.0",
-    "eslint": "^9.13.0",
-    "typescript-eslint": "^8.15.0",
-    "prettier": "^3.3.3",
     "@commitlint/cli": "^19.5.0",
-    "@commitlint/config-conventional": "^19.5.0"
+    "@commitlint/config-conventional": "^19.5.0",
+    "@types/express": "^5.0.0",
+    "@types/node": "^22.0.0",
+    "@types/supertest": "^7.2.1",
+    "eslint": "^9.13.0",
+    "prettier": "^3.3.3",
+    "supertest": "^7.2.2",
+    "typescript": "^5.6.0",
+    "typescript-eslint": "^8.15.0",
+    "vitest": "^4.1.10"
   }
 }

src/bin/server.ts

@@ -0,0 +1,5 @@
+import { app, port } from "../index.js";
+
+app.listen(port, () => {
+  console.log(`demo-app listening on :${port}`);
+});

src/index.test.ts

@@ -1,7 +1,33 @@
-import test from "node:test";
-import assert from "node:assert/strict";
+import { describe, it, expect } from "vitest";
+import request from "supertest";
+import { app } from "./index.js";
 import { greeting } from "./greeting.js";
 
-test("greeting mentions the homelab", () => {
-  assert.match(greeting(), /homelab/);
+describe("greeting", () => {
+  it("mentions the homelab", () => {
+    expect(greeting()).toMatch(/homelab/);
+  });
+});
+
+describe("GET /healthz", () => {
+  it("returns 200 ok", async () => {
+    const res = await request(app).get("/healthz");
+    expect(res.status).toBe(200);
+    expect(res.text).toBe("ok");
+    expect(res.type).toBe("text/plain");
+  });
+});
+
+describe("GET /", () => {
+  it("returns service info", async () => {
+    const res = await request(app).get("/");
+    expect(res.status).toBe(200);
+    expect(res.body).toMatchObject({
+      service: "demo-app",
+      message: "Hello from the homelab pipeline!",
+      sha: expect.any(String),
+      pod: expect.any(String),
+      time: expect.any(String),
+    });
+  });
 });

src/index.ts

@@ -1,32 +1,23 @@
-import { createServer } from "node:http";
+import express from "express";
 import { hostname } from "node:os";
 import { greeting } from "./greeting.js";
 
+const app = express();
 const port = Number(process.env.PORT ?? 3000);
 const sha = process.env.GIT_SHA ?? "dev";
 
-const server = createServer((req, res) => {
-  if (req.url === "/healthz") {
-    res.writeHead(200, { "content-type": "text/plain" });
-    res.end("ok");
-    return;
-  }
-  res.writeHead(200, { "content-type": "application/json" });
-  res.end(
-    JSON.stringify(
-      {
+app.get("/healthz", (_req, res) => {
+  res.type("text/plain").send("ok");
+});
+
+app.get("/", (_req, res) => {
+  res.json({
     service: "demo-app",
     message: greeting(),
     sha,
     pod: hostname(),
     time: new Date().toISOString(),
-      },
-      null,
-      2,
-    ) + "\n",
-  );
+  });
 });
 
-server.listen(port, () => {
-  console.log(`demo-app ${sha} listening on :${port}`);
-});
+export { app, port };

vitest.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["src/**/*.test.ts"],
+  },
+});