--- a/tests/automated/lisp-tests.el	Mon Aug 13 11:25:03 2007 +0200
+++ b/tests/automated/lisp-tests.el	Mon Aug 13 11:26:11 2007 +0200
@@ -229,6 +229,8 @@
 (Assert (= (+ 1.0 1) 2.0))
 (Assert (= (+ 1.0 1 1) 3.0))
 (Assert (= (+ 1 1 1.0) 3.0))
+(Assert (eq (1+ most-positive-fixnum) most-negative-fixnum))
+(Assert (eq (+ most-positive-fixnum 1) most-negative-fixnum))
 
 ;; Test `-'
 (Check-Error wrong-number-of-arguments (-))
@@ -253,6 +255,9 @@
 (Assert (= (- 1.5 1) .5))
 (Assert (= (- 1 1.5) (- .5)))
 
+(Assert (eq (1- most-negative-fixnum) most-positive-fixnum))
+(Assert (eq (- most-negative-fixnum 1) most-positive-fixnum))
+
 ;; Test `/'
 
 ;; Test division by zero errors