TestNG Ant task classfilesets setting does not work for more than one class.

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What steps will reproduce the problem?
1. Create TestNG ant command with classfilesets. classfilesets should have two 
test classes
2. run the command


What is the expected output? What do you see instead?
Tests should run successfully. I get an error - Invalid byte 2 of 2-byte UTF-8 
sequence.

What version of the product are you using? On what operating system?
TestNG 5.13

Please provide any additional information below.
On debugging the issue, I found out that TestNGAntTask creates the -testclass 
argument values without a comma. But the TestNG class expects the classes 
delimited with a comma.

Original issue reported on code.google.com by [email protected] on 12 Aug 2010 at 11:58