src/test/resources/package.xml

<!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" >
  
<suite name="Package" verbose="1" parallel="false" thread-count="4"
    data-provider-thread-count="3">

  <listeners>
    <listener class-name="test.tmp.BListener" />
  </listeners>

  <test name="A">
    <groups>
      <run>
        <include name="group-a" />
      </run>
    </groups>
    <packages>
      <package name="test.tmp.a" />
      <package name="test.tmp.b" />
    </packages>
  </test>

<!-- 
  <test name="B">
    <packages>
      <package name="test.tmp.b" />
    </packages>
  </test>
 -->
 
</suite>