1 files changed, 12 insertions, 0 deletions

diff --git a/test/src/floatfns-tests.el b/test/src/floatfns-tests.el
index cb173eea76d..7714c05d60a 100644
--- a/test/src/floatfns-tests.el
+++ b/test/src/floatfns-tests.el
@@ -34,4 +34,16 @@
   (should-error (ftruncate 0) :type 'wrong-type-argument)
   (should-error (fround 0) :type 'wrong-type-argument))
 
+(ert-deftest bignum-to-float ()
+  (should (eql (float (+ most-positive-fixnum 1))
+               (+ (float most-positive-fixnum) 1))))
+
+(ert-deftest bignum-abs ()
+  (should (= most-positive-fixnum
+             (- (abs most-negative-fixnum) 1))))
+
+(ert-deftest bignum-logb ()
+  (should (= (+ (logb most-positive-fixnum) 1)
+             (logb (+ most-positive-fixnum 1)))))
+
 (provide 'floatfns-tests)