TestNG doc says create an xml as below. 

```
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >

<suite name="Suite1" verbose="1" >
   <test name="Regression1"   >
     <packages>
     <package name="test.sample" />
     </packages>
   </test>
</suite>

```

Where should this file be?