import { describe, test, expect } from "bun:test";
import { getLanIPs } from "../cert.js";

describe("getLanIPs", () => {
  test("returns an array", () => {
    const ips = getLanIPs();
    expect(Array.isArray(ips)).toBe(true);
  });

  test("returns only IPv4 addresses", () => {
    const ips = getLanIPs();
    for (const ip of ips) {
      // IPv4 format: x.x.x.x
      expect(ip).toMatch(/^\d+\.\d+\.\d+\.\d+$/);
    }
  });

  test("does not include loopback addresses", () => {
    const ips = getLanIPs();
    expect(ips).not.toContain("127.0.0.1");
  });

  test("may be empty in isolated environments", () => {
    // This test just ensures it doesn't throw
    const ips = getLanIPs();
    expect(ips.length).toBeGreaterThanOrEqual(0);
  });
});