cakephp/tests/phpunit_aliases.php

<?php
if (class_exists('PHPUnit_Runner_Version')) {
    if (version_compare(\PHPUnit_Runner_Version::id(), '5.7', '<')) {
        trigger_error(sprintf('Your PHPUnit Version must be at least 5.7.0 to use CakePHP Testsuite, found %s', \PHPUnit_Runner_Version::id()), E_USER_ERROR);
    }

    class_alias('PHPUnit_Framework_Test', 'PHPUnit\Framework\Test');
    class_alias('PHPUnit_Framework_AssertionFailedError', 'PHPUnit\Framework\AssertionFailedError');
    class_alias('PHPUnit_Framework_TestSuite', 'PHPUnit\Framework\TestSuite');
}