After cd to some new directory in #RA6, it does not appear there are tests to ensure programs such as ls -l run against the new working dir.
For completeness, there should be a test to check program execution against the new working dir.
Great work for making Shell challenge - very satisfying to being with. In any case, it also felt good to hook up cd some location, and see it work with an arbitrary executable. FWIW I added a tip for those on the Java track in #RA6.