Test suite: improve robustness of cloning a Git repository
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.
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