<phpunit defaultTestSuite="Second">
    <testsuites>
        <testsuite name="First">
            <file>../_files/DummyFooTest.php</file>
        </testsuite>
        <testsuite name="Second">
            <file>../_files/DummyBarTest.php</file>
        </testsuite>
    </testsuites>
</phpunit>
