untracked-cache: be defensive about missing NULs in index

diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index 9ccdf08730e5b712c0b5d70b0c13505ce8acec03..9f8f0e84ad4f35b72da73ef8ddfee0a3cddfbe1a 100755 (executable)
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -98,6 +98,12 @@ test_expect_success setup '
        git commit -m "update mode" &&
        git checkout -f master &&
 
+       # Same merge as master, but with parents reversed. Hide it in a
+       # pseudo-ref to avoid impacting tests with --all.
+       commit=$(echo reverse |
+                git commit-tree -p master^2 -p master^1 master^{tree}) &&
+       git update-ref REVERSE $commit &&
+
        git config diff.renames false &&
 
        git show-branch
@@ -240,6 +246,7 @@ diff-tree --cc --stat --summary master
 diff-tree -c --stat --summary side
 diff-tree --cc --stat --summary side
 diff-tree --cc --shortstat master
+diff-tree --cc --summary REVERSE
 # improved by Timo's patch
 diff-tree --cc --patch-with-stat master
 # improved by Timo's patch
@@ -351,6 +358,7 @@ diff --line-prefix=abc master master^ side
 diff --dirstat master~1 master~2
 diff --dirstat initial rearrange
 diff --dirstat-by-file initial rearrange
+diff --dirstat --cc master~1 master
 # No-index --abbrev and --no-abbrev
 diff --raw initial
 :noellipses diff --raw initial