Add corner case tests for diff-index and diff-files

diff --git a/unpack-trees.h b/unpack-trees.h
index e8abbcd037167a58c816d94f4f0c617d6572d23d..50453ed20f755fea2e7138d7f01300b318f28dce 100644 (file)
--- a/unpack-trees.h
+++ b/unpack-trees.h
@@ -1,6 +1,8 @@
 #ifndef UNPACK_TREES_H
 #define UNPACK_TREES_H
 
+#define MAX_UNPACK_TREES 8
+
 struct unpack_trees_options;
 
 typedef int (*merge_fn_t)(struct cache_entry **src,