diff -r 3a57eafd8401 Lib/test/test_pydoc.py
--- a/Lib/test/test_pydoc.py	Tue May 24 09:15:14 2016 +0300
+++ b/Lib/test/test_pydoc.py	Wed May 25 18:48:16 2016 +0200
@@ -1057,6 +1057,12 @@
         self.assertIn('class Enum', helptext)
 
 
+class MiscTestCase(unittest.TestCase):
+    def test__all__(self):
+        expected = ["help"]
+        self.assertCountEqual(expected, pydoc.__all__)
+
+
 @reap_threads
 def test_main():
     try:
@@ -1067,6 +1073,7 @@
                                   PydocUrlHandlerTest,
                                   TestHelper,
                                   PydocWithMetaClasses,
+                                  MiscTestCase,
                                   )
     finally:
         reap_children()