t7701-repack-unpack-unreachable.sh: check timestamp of unpacked objects

index 6a5211f..63485c1 100755
@@ -4,6 +4,10 @@ test_description='git-repack works correctly'
 
 . ./test-lib.sh
 
+fsha1=
+csha1=
+tsha1=
+
 test_expect_success '-A option leaves unreachable objects unpacked' '
 	echo content > file1 &&
 	git add . &&

@@ -44,4 +48,34 @@ test_expect_success '-A option leaves unreachable objects unpacked' '
 	git show $tsha1
 '
 
+compare_mtimes ()
+{
+	perl -e 'my $reference = shift;
+		 foreach my $file (@ARGV) {
+			exit(1) unless(-f $file && -M $file == -M $reference);
+		 }
+		 exit(0);
+		' -- "$@"
+}
+
+test_expect_success 'unpacked objects receive timestamp of pack file' '
+	fsha1path=$(echo "$fsha1" | sed -e "s/\(..\)\(.*\)/\1\/\2/") &&
+	fsha1path=".git/objects/$fsha1path" &&
+	csha1path=$(echo "$csha1" | sed -e "s/\(..\)\(.*\)/\1\/\2/") &&
+	csha1path=".git/objects/$csha1path" &&
+	tsha1path=$(echo "$tsha1" | sed -e "s/\(..\)\(.*\)/\1\/\2/") &&
+	tsha1path=".git/objects/$tsha1path" &&
+	git branch transient_branch $csha1 &&
+	git repack -a -d -l &&
+	test ! -f "$fsha1path" &&
+	test ! -f "$csha1path" &&
+	test ! -f "$tsha1path" &&
+	test 1 = $(ls -1 .git/objects/pack/pack-*.pack | wc -l) &&
+	packfile=$(ls .git/objects/pack/pack-*.pack) &&
+	git branch -D transient_branch &&
+	sleep 1 &&
+	git repack -A -l &&
+	compare_mtimes "$packfile" "$fsha1path" "$csha1path" "$tsha1path"
+'
+
 test_done