<phpunit bootstrap="index.php">
  <testsuites>
    <testsuite name="acd">
      <directory>core/tests</directory>
    </testsuite>
  </testsuites>
</phpunit>
 <testsuites>
    <testsuite name="acd">
      <directory>core/tests</directory>
    </testsuite>
  </testsuites>

Test without php unit tag
Test without php unit tag