t0302: "unreadable" test needs SANITY prereq The test expects that "chmod -r ~/.git-credentials" would make it unreadable to the user, and thus needs the SANITY prerequisite. Reported-by: Jean-Yves LENHOF <jean-yves@lenhof.eu.org> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>