Change the PyUnit-based tests to use the test_main() approach.  This
allows using the tests with unittest.py as a script.  The tests will
still run when run as a script themselves.
diff --git a/Lib/test/test_repr.py b/Lib/test/test_repr.py
index cd9675a..b7d9374 100644
--- a/Lib/test/test_repr.py
+++ b/Lib/test/test_repr.py
@@ -265,6 +265,11 @@
         raise Exception("This should be caught by Repr.repr_instance")
 
 
-run_unittest(ReprTests)
-if os.name != 'mac':
-    run_unittest(LongReprTest)
+def test_main():
+    run_unittest(ReprTests)
+    if os.name != 'mac':
+        run_unittest(LongReprTest)
+
+
+if __name__ == "__main__":
+    test_main()