Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / vendor / phpunit / phpunit / tests / _files / WasRun.php

<?php
class WasRun extends PHPUnit_Framework_TestCase
{
    public $wasRun = false;

    protected function runTest()
    {
        $this->wasRun = true;
    }
}