Testng verbose config
In testng.xml, the "verbose" attribute of the suite tag is very useful for troubleshooting configuration related error. Its values can be set as 1 to 10, and smaller value means lower verbose and bigger value means higher verbose.
<suite name="Test suite name" verbose="1">
<test name="Test case name" preserve-order="true">
<packages>
<package name="space.yuanjiang.test.*">
...
</package>
</packages>
</test>
...
</suite>
Reference here