GNUstep Testsuite is available in GNUstep CVS. It is the only unit test designed for GNUstep. UnitKit and OCUnit are designed for Mac and ported to GNUstep. I cannot get OCUnit to work on GNUstep. UnitKit works for GNUstep, but depends on gnustep-back. Therefore, even used in command-line tool or library, it can only run with Xwindow.