convert usage of fail* to assert*
diff --git a/Lib/test/test_poplib.py b/Lib/test/test_poplib.py
index ad4b8d3..506d183 100644
--- a/Lib/test/test_poplib.py
+++ b/Lib/test/test_poplib.py
@@ -246,7 +246,7 @@
             self.client = poplib.POP3_SSL(self.server.host, self.server.port)
 
         def test__all__(self):
-            self.assert_('POP3_SSL' in poplib.__all__)
+            self.assertTrue('POP3_SSL' in poplib.__all__)
 
 
 class TestTimeouts(TestCase):