diff --git Lib/test/test_set.py Lib/test/test_set.py
index 0c29017..049c2fc 100644
--- Lib/test/test_set.py
+++ Lib/test/test_set.py
@@ -750,7 +750,7 @@ class TestBasicOps(unittest.TestCase):
         result = self.set ^ self.set
         self.assertEqual(result, empty_set)
 
-    def checkempty_symmetric_difference(self):
+    def test_checkempty_symmetric_difference(self):
         result = self.set ^ empty_set
         self.assertEqual(result, self.set)
 
diff --git Lib/test/test_sets.py Lib/test/test_sets.py
index 0754ed7..2855910 100644
--- Lib/test/test_sets.py
+++ Lib/test/test_sets.py
@@ -56,7 +56,7 @@ class TestBasicOps(unittest.TestCase):
         result = self.set ^ self.set
         self.assertEqual(result, empty_set)
 
-    def checkempty_symmetric_difference(self):
+    def test_checkempty_symmetric_difference(self):
         result = self.set ^ empty_set
         self.assertEqual(result, self.set)