On a fast system, I've seen the "I clone the Git repository […]" scenario fail
because "test -d '/home/amnesia/testing/.git" returned 1. This check was done
just a few milliseconds after "Unpacking objects: 100%" appeared in the
Terminal. My hypothesis here is that Git takes a a little bit of time, after
displaying "Unpacking objects: 100%", until it actually puts the cloned files
into place.