import { describe, it, expect } from "vitest";
import Fastify from "fastify";
import { registerVersionHeader, readAppVersion } from "../middleware/version";

/**
 * The server stamps every response with X-App-Version so the SPA can detect a
 * deploy (the client compares it to the version baked into its bundle).
 */

describe("registerVersionHeader", () => {
  it("adds X-App-Version to responses", async () => {
    const app = Fastify({ logger: false });
    registerVersionHeader(app, "9.9.9");
    app.get("/ping", async () => ({ ok: true }));

    const res = await app.inject({ method: "GET", url: "/ping" });
    expect(res.headers["x-app-version"]).toBe("9.9.9");
    await app.close();
  });

  it("defaults to the package.json version (semver string)", () => {
    expect(readAppVersion()).toMatch(/^\d+\.\d+\.\d+/);
  });
});