[build] Fixed tests.
- Negative yoffsets work only when moving before a field that is not the top field. Using 0 yoffset works both for moving before top fields and also before lower ones.
- xoffset seems to work fine with a value of 0, so I also removed the comment saying it doesn't.

(cherry picked from commit 73bf8ed665e2e7a10540a9f753f87f60ec6d9edb)