src/test/java/test/testng56/testng-56.xml

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="TESTNG-56 Suite" verbose="3" parallel="true" thread-count="3">
  <test name="TESTNG-56">
      <packages>
          <package name="test.testng56" />
      </packages>
  </test>
</suite>