test.js

"use strict";

const {v4, v6} = require(".");
const {env} = require("process");
const {isIPv4, isIPv6} = require("net");
const os = require("os");
const {test, expect} = global;

// only Darwin has IPv6 on GitHub Actions
const canTestV6 = env.CI ? os.platform() === "darwin" : true;

test("v4 async", async () => {
  const result = await v4();
  expect(isIPv4(result.gateway)).toBe(true);
  expect(typeof result.interface).toBe("string");
});

test("v4 sync", () => {
  const result = v4.sync();
  expect(isIPv4(result.gateway)).toBe(true);
  expect(typeof result.interface).toBe("string");
});

if (canTestV6) {
  test("v6 async", async () => {
    const result = await v6();
    expect(isIPv6(result.gateway)).toBe(true);
    expect(typeof result.interface).toBe("string");
  });

  test("v6 sync", () => {
    const result = v6.sync();
    expect(isIPv6(result.gateway)).toBe(true);
    expect(typeof result.interface).toBe("string");
  });
}

test("unsupported", async () => {
  const mock = jest.spyOn(os, "platform");
  mock.mockImplementation(() => "unsupported");
  jest.resetModules();
  const {v4, v6} = require(".");

  expect(() => v4.sync()).toThrow();
  expect(() => v6.sync()).toThrow();
  await expect(v4()).rejects.toThrow();
  await expect(v6()).rejects.toThrow();

  mock.mockRestore();
});