/**
 * Route-level test for GET /api/ready (BACKLOG P0-3: "no /ready route
 * existed at all"). Unlike /api/health, readiness fails closed: 503 when the
 * load-bearing dependency (db) is not both configured and reachable.
 */
import { describe, it, expect, beforeEach, afterEach } from "vitest";
import { GET as readyGET } from "@/app/api/ready/route";

describe("GET /api/ready", () => {
  const savedEnv = {
    DATABASE_URL: process.env.DATABASE_URL,
    POSTGRES_URL: process.env.POSTGRES_URL,
  };

  beforeEach(() => {
    delete process.env.DATABASE_URL;
    delete process.env.POSTGRES_URL;
  });

  afterEach(() => {
    for (const [k, v] of Object.entries(savedEnv)) {
      if (v === undefined) delete process.env[k];
      else process.env[k] = v;
    }
  });

  it("fails closed with 503 when the database is not configured", async () => {
    const res = await readyGET();
    expect(res.status).toBe(503);
    const body = await res.json();
    expect(body.ready).toBe(false);
    expect(body.db).toBe("not_configured");
  });
});