phpunit_builtin_autoloader.xml

<phpunit bootstrap="tests/TestBootstrapBuiltinAutoloader.php">

    <testsuites>
        <testsuite name="Built-in autoloader">
            <directory>tests</directory>
        </testsuite>
    </testsuites>

    <listeners>
        <listener class="MockFilesHandler" file="tests/MockFilesHandler.php">
        </listener>
    </listeners>

    <filter>
        <whitelist>
            <directory>src</directory>
        </whitelist>
    </filter>

</phpunit>