I have built a <a target=_blank href='https://weibomiaopai.com/download-video-parser.php'>video download tool</a> and I have written quite a few unit tests using <a target=_blank href='https://helloacm.com/how-to-unit-test-url-connectivity-via-phpunit/'>PHPUnit</a>. It takes  a while to run through all tests!
<a href='/static/blog/2017/phpunit.jpg' target=_blank><img src='/static/blog/2017/phpunit.jpg' alt='Run PHPUnit Tests on VPS Server' /></a>