Invoking TestNG with testng.xml file

//testng.xml

1. <suite name="My Suite">
2.   <test name="My testNG test">
3.     <classes>
4.        <class name="example.test.TestNGSimpleTest" />
5.     </classes>
6.   </test>
7. </suite>

You can specify package names instead of class names:

1. <suite name="My Suite">
2.   <test name="My testNG test">
3.     <packages>
4.       <package name="example.test" />
5.    </packages>
6.  </test>
7. </suite>