[PATCH 5/7] t1006: test cat-file --batch-all-objects with duplicates

[Jeff King <peff@peff.net>]

The test for --batch-all-objects in t1006 covers a variety
of object storage situations, but one thing it doesn't cover
is that we avoid mentioning duplicate objects. We won't have
any because running "git repack -ad" will have packed them
all and deleted the loose ones.

This does work (because we sort and de-dup the output list),
but it's good to include it in our test. And doubly so for
when we add an unordered mode which has to de-dup in a
different way.

Note that we cannot just re-create one of the objects, as
Git will omit the write of an object that is already
present. However, we can create a new pack with one of the
objects, which forces the duplication.

One alternative would be to just use "git repack -a" instead
of "-ad". But then _every_ object would be duplicated as
loose and packed, and we might miss a bug that omits packed
objects (because we'd show their loose counterparts).

Signed-off-by: Jeff King <peff@peff.net>
---
 t/t1006-cat-file.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/t/t1006-cat-file.sh b/t/t1006-cat-file.sh
index 13dd510b2e..4fb5e098f2 100755
--- a/t/t1006-cat-file.sh
+++ b/t/t1006-cat-file.sh
@@ -550,8 +550,8 @@ test_expect_success 'git cat-file --batch --follow-symlink returns correct sha a
 test_expect_success 'cat-file --batch-all-objects shows all objects' '
 	# make new repos so we know the full set of objects; we will
 	# also make sure that there are some packed and some loose
-	# objects, some referenced and some not, and that there are
-	# some available only via alternates.
+	# objects, some referenced and some not, some duplicates, and that
+	# there are some available only via alternates.
 	git init all-one &&
 	(
 		cd all-one &&
@@ -567,6 +567,8 @@ test_expect_success 'cat-file --batch-all-objects shows all objects' '
 		cd all-two &&
 		echo local-unref | git hash-object -w --stdin
 	) >>expect.unsorted &&
+	git -C all-two rev-parse HEAD:file |
+		git -C all-two pack-objects .git/objects/pack/pack &&
 	sort <expect.unsorted >expect &&
 	git -C all-two cat-file --batch-all-objects \
 				--batch-check="%(objectname)" >actual &&
-- 
2.18.0.1058.g7433f71063