src/test/resources/parallel-suites/suite-parallel-2.xml

<suite name="Suite Parallel 2">

  <test name="Test2">
    <classes>
      <class name="test.thread.Sample2"/>
    </classes>
  </test>

  <suite-files>
    <suite-file path="./suite-parallel-2-1.xml" />
    <suite-file path="./suite-parallel-2-2.xml" />
  </suite-files>
</suite>