title: PHP Unit testing is not compatible with PHP8, does it support backward compatibility?
body: <p>I have several test units in PHPUnit and the PHPUnit is not compatible with php8. I`m looking for a way to run old tests on PHP8.
  Is there any wrapper for PHPUnit to work with PHP8?</p>
  <p>By the way, this my error on composer install:</p>
  <pre><code>    - phpunit/phpunit 9.1.1 requires php ^7.3 -&gt; your PHP version (8.0.1) does not satisfy that requirement.
  </code></pre>
  <p>It may work by removing the requirement from the PHPUnit composer file.</p>