diff --git a/src/tests/test_shamira.py b/src/tests/test_shamira.py
--- a/src/tests/test_shamira.py
+++ b/src/tests/test_shamira.py
@@ -20,9 +20,9 @@ class TestShamira(TestCase):
 		os.urandom=cls._urandom
 
 	def test_shareByte(self):
-		with self.assertRaises(AssertionError): # too few shares
+		with self.assertRaises(ValueError): # too few shares
 			_shareByte(b"a",5,4)
-		with self.assertRaises(AssertionError): # too many shares
+		with self.assertRaises(ValueError): # too many shares
 			_shareByte(b"a",5,255)
 		with self.assertRaises(ValueError): # not castable to int
 			_shareByte("x",2,3)