About a question of Hadoop

[王栓奇]

 Hi, 

 I am using Herriot of Hadoop 0.21. However, I meet a problem. What does 
"test-system" mean in the following ant command

ant test-system -Dhadoop.conf.dir.deployed=${HADOOP_CONF_DIR}
from webpage:http://wiki.apache.org/hadoop/HowToUseSystemTestFramework
 
Thank you very much!
 
Shuanqi Wang
Beijing, China