if (!isset($CFG->phpunit_dataroot)) {
phpunit_bootstrap_error(PHPUNIT_EXITCODE_CONFIGERROR, 'Missing $CFG->phpunit_dataroot in config.php, can not run tests!');
}
+// Ensure we access to phpunit_dataroot realpath always.
+$CFG->phpunit_dataroot = realpath($CFG->phpunit_dataroot);
+
if (isset($CFG->dataroot) and $CFG->phpunit_dataroot === $CFG->dataroot) {
phpunit_bootstrap_error(PHPUNIT_EXITCODE_CONFIGERROR, '$CFG->dataroot and $CFG->phpunit_dataroot must not be identical, can not run tests!');
}