src/test/java/test/xml/suite1.xml

<suite name="Suite 1">

  <test name="Suite 1 Tests">
    <classes>
      <class name="test.xml.XmlVerifyTest">
         <methods>
            <include name="simple"/>
         </methods>
      </class>
    </classes>
  </test>
  <suite-files>
   <suite-file path="./suite1-1.xml" />
   <suite-file path="./suite1-2.xml" />
  </suite-files>
</suite>