src/test/resources/testng-package.xml

<!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" >
  
<suite name="SingleSuite" verbose="2" parallel="false" thread-count="4"
    data-provider-thread-count="3">

  <test name="Nested" >
    <groups>
      <run>
        <include name="unittest" />
      </run>
    </groups>

    <packages>
      <package name="test.nested.*"/>
    </packages>
  </test>

</suite>