--- a/src/tests.py
+++ b/src/tests.py
@@ -28,6 +28,7 @@
     # Superclass with tests common to all generators.
     # Subclasses must arrange for self.gen to retrieve the Random instance
     # to be tested.
+    gen = random.Random()
 
     def randomlist(self, n):
         """Helper function to make a list of random numbers"""
@@ -448,8 +452,6 @@
         self.assertRaises(TypeError, self.gen.getrandbits)
         self.assertRaises(TypeError, self.gen.getrandbits, 'a')
         self.assertRaises(TypeError, self.gen.getrandbits, 1, 2)
-        if sys.version_info < (3, 9):
-            self.assertRaises(ValueError, self.gen.getrandbits, 0)
         self.assertRaises(ValueError, self.gen.getrandbits, -1)
 
     def test_randbelow_logic(self, _log=log, int=int):