Add test_main() methods. These three tests were never run
by regrtest.py.

We really need a simpler testing framework.
diff --git a/Lib/test/test_iterlen.py b/Lib/test/test_iterlen.py
index bcd0a6f..7d2cfb2 100644
--- a/Lib/test/test_iterlen.py
+++ b/Lib/test/test_iterlen.py
@@ -235,9 +235,7 @@
         self.assertEqual(len(it), 0)
 
 
-
-if __name__ == "__main__":
-
+def test_main():
     unittests = [
         TestRepeat,
         TestXrange,
@@ -255,3 +253,7 @@
         TestSeqIterReversed,
     ]
     test_support.run_unittest(*unittests)
+
+if __name__ == "__main__":
+    test_main()
+