diff --git a/tests/01_int.py b/tests/01_int.py
index 2f3806a8..2c13964c 100644
--- a/tests/01_int.py
+++ b/tests/01_int.py
@@ -61,6 +61,9 @@ assert (-1).bit_length() == 1
 assert (-2).bit_length() == 2
 assert (-3).bit_length() == 2
 
+assert (123123123123123).bit_length() == 47
+assert (-3123123123).bit_length() == 32
+
 # test int()
 assert int() == 0
 assert int(True) == 1