[PATCH 5/9] tests: be sure that backups are safe.

[Akim Demaille]

* tests/local.at (at_save_special_files): here.
---
 tests/local.at | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/local.at b/tests/local.at
index f253280..2dbbfc7 100644
--- a/tests/local.at
+++ b/tests/local.at
@@ -53,6 +53,8 @@ m4_divert_text([PREPARE_TESTS],
 {
   for at_save_file in stderr experr expout
   do
+    test ! -f at-bison-check-$at_save_file.bak ||
+      as_fn_error 1 "fatal error: back-up on top of a back-up"
     test ! -f $at_save_file || mv $at_save_file 
at-bison-check-$at_save_file.bak
   done
 }
-- 
1.7.11.2