t2200: check that "add -u" limits itself to subdirectory
This behavior is due to change in the future, but let's test it anyway. That helps make sure we do not accidentally switch the behavior too soon while we are working in the area, and it means that we can easily verify the change when we do make it. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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