/usr/bin/NSImageTest is in gnustep-examples 1:1.3.0-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/GNUstep/Applications/NSImageTest.app/NSImageTest
/usr/bin/../lib/GNUstep/Applications/NSImageTest.app/NSImageTest