@networkpro/web/tests/unit/utm.test.js

Locking Down Networks, Unlocking Confidence™ | Security, Networking, Privacy — Network Pro Strategies

/* ==========================================================================
tests/unit/utm.test.js

Copyright © 2025 Network Pro Strategies (Network Pro™)
SPDX-License-Identifier: CC-BY-4.0 OR GPL-3.0-or-later
This file is part of Network Pro.
========================================================================== */

import { appendUTM } from '$lib/utils/utm.js';
import { afterEach, describe, expect, it } from 'vitest';

describe('appendUTM', () => {
  const originalWindow = globalThis.window;

  afterEach(() => {
    globalThis.window = originalWindow;
  });

  it('should return null when not in a browser environment', () => {
    // @ts-expect-error – simulating SSR
    delete globalThis.window;

    const url = 'https://example.com';
    const result = appendUTM(url);
    expect(result).toBe(null);
  });

  it('should return URL with utm_source appended', () => {
    globalThis.window = {
      // @ts-expect-error – mock minimal window for test
      location: { search: '?utm_source=linkedin' },
    };

    const url = 'https://example.com';
    const result = appendUTM(url);
    expect(result).toBe('https://example.com?utm_source=linkedin');
  });

  it('should return original URL if no utm_source is present', () => {
    globalThis.window = {
      // @ts-expect-error – mock minimal window for test
      location: { search: '' },
    };

    const url = 'https://example.com';
    const result = appendUTM(url);
    expect(result).toBe('https://example.com');
  });
});