Is there a way to run a test about some class?

[Fang Fang FF Chen]

Every time I run tests with "ant tests", it will lasted for nearly 7 hours.
Now I just want to run some test(i.e Running
org.apache.pig.test.TestJobSubmission).
Is there a command or a way which is available for my idea? Thank you.
Thanks.
Regards,
FangFang CHEN / 陈芳芳
----------------------------------
BigInsights Team, CDL
Phone:   86-10-82453744
----------------------------------