test/factory.xml

<!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" >
  
<suite name="Suite 1" verbose="3">
  <test name="Factory">
    <classes>
      <class name="test.factory.FactoryInSeparateClass" />
      <class name="test.factory.MyTest"/> 
    </classes>
  </test>

</suite>