cherry-pick: demonstrate a segmentation fault

In https://github.com/git-for-windows/git/issues/952, a complicated scenario was described that leads to a segmentation fault in cherry-pick. It boils down to a certain code path involving a renamed file that is dirty, for which `refresh_cache_entry()` returns `NULL`, and that `NULL` not being handled properly. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Johannes Schindelin committed Nov 26, 2016 at 13:48 UTC 05f2dfb965476a59050b7c3446b1281bdcac7051
1 file changed +12
t/t3501-revert-cherry-pick.sh
+12
@@ -141,4 +141,16 @@ test_expect_success 'cherry-pick "-" works with arguments' '
141 test_cmp expect actual
142 '
143
144 +test_expect_failure 'cherry-pick works with dirty renamed file' '
145 + test_commit to-rename &&
146 + git checkout -b unrelated &&
147 + test_commit unrelated &&
148 + git checkout @{-1} &&
149 + git mv to-rename.t renamed &&
150 + test_tick &&
151 + git commit -m renamed &&
152 + echo modified >renamed &&
153 + git cherry-pick refs/heads/unrelated
154 +'
155 +
156 test_done