Scaffold Docker-only Node 24 + TypeScript EJS web backend

src/app.test.ts

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+import assert from "node:assert/strict";
+import type { AddressInfo } from "node:net";
+import { after, before, test } from "node:test";
+import { createApp } from "./app.ts";
+import { contentTypeFor, resolveStaticPath } from "./static.ts";
+
+const server = createApp();
+let base = "";
+
+before(async () => {
+  await new Promise<void>((resolve) => server.listen(0, resolve));
+  base = `http://localhost:${(server.address() as AddressInfo).port}`;
+});
+
+after(() => server.close());
+
+test("serves the home page as HTML", async () => {
+  const res = await fetch(base + "/");
+  assert.equal(res.status, 200);
+  assert.match(res.headers.get("content-type") ?? "", /text\/html/);
+  assert.match(await res.text(), /Plainpages/);
+});
+
+test("serves static CSS", async () => {
+  const res = await fetch(base + "/public/css/style.css");
+  assert.equal(res.status, 200);
+  assert.match(res.headers.get("content-type") ?? "", /text\/css/);
+});
+
+test("returns 404 for unknown routes", async () => {
+  const res = await fetch(base + "/missing");
+  assert.equal(res.status, 404);
+});
+
+test("resolveStaticPath blocks traversal, allows nested files", () => {
+  assert.equal(resolveStaticPath("/srv/public", "../app.ts"), null);
+  assert.equal(resolveStaticPath("/srv/public", "css/style.css"), "/srv/public/css/style.css");
+});
+
+test("contentTypeFor maps known and unknown extensions", () => {
+  assert.match(contentTypeFor("a.css"), /text\/css/);
+  assert.equal(contentTypeFor("a.bin"), "application/octet-stream");
+});