Robotium side scroll not working for me

I want to scroll left/right on an android application using a Robotium/Junit test.

There is a function in Robotium called:

solo.scrollToSide(int);

But, what do I put for the int? what is the value for RIGHT and what is the value for LEFT? I tried 0,1,2,3, and 4... no luck :(

Thanks

EDIT:

I found the answer. RIGHT is 22 and LEFT is 21.