diff options
Diffstat (limited to 'test/src/fns-tests.el')
| -rw-r--r-- | test/src/fns-tests.el | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/test/src/fns-tests.el b/test/src/fns-tests.el index f722ed6333e..92dc18fa034 100644 --- a/test/src/fns-tests.el +++ b/test/src/fns-tests.el @@ -624,4 +624,20 @@ (should (eq (gethash b2 hash) (funcall test b1 b2))))))) +(ert-deftest test-nthcdr-circular () + (dolist (len '(1 2 5 37 120 997 1024)) + (let ((cycle (make-list len nil))) + (setcdr (last cycle) cycle) + (dolist (n (list (1- most-negative-fixnum) most-negative-fixnum + -1 0 1 + (1- len) len (1+ len) + most-positive-fixnum (1+ most-positive-fixnum) + (* 2 most-positive-fixnum) + (* most-positive-fixnum most-positive-fixnum) + (ash 1 12345))) + (let ((a (nthcdr n cycle)) + (b (if (<= n 0) cycle (nthcdr (mod n len) cycle)))) + (should (equal (list (eq a b) n len) + (list t n len)))))))) + (provide 'fns-tests) |