diff -r af793c7580f1 Lib/test/test_random.py
--- a/Lib/test/test_random.py	Wed Jun 17 10:09:24 2015 -0500
+++ b/Lib/test/test_random.py	Thu Jun 25 23:51:37 2015 +0200
@@ -17,6 +17,11 @@
         """Helper function to make a list of random numbers"""
         return [self.gen.random() for i in range(n)]
 
+    def fake_random(self, f=0.1):
+        # This function is used to test a meathod's ability to
+        # use an alternitive to reandom.random()
+        return f
+
     def test_autoseed(self):
         self.gen.seed()
         state1 = self.gen.getstate()
@@ -87,6 +92,14 @@
         self.assertTrue(lst != shuffled_lst)
         shuffle(lst)
         self.assertTrue(lst != shuffled_lst)
+        # The tests below verify that random.shuffle() properly uses a
+        # function passed to it in place of random.random()
+        lst = list(range(1000))
+        shuffled_lst = list(range(1000))
+        shuffle(shuffled_lst, self.fake_random)
+        self.assertTrue(lst != shuffled_lst)
+        shuffle(lst, self.fake_random)
+        self.assertTrue(lst == shuffled_lst)
 
     def test_choice(self):
         choice = self.gen.choice