Add test_main() functions to various tests where it was simple to do. Done so
that regrtest can execute the test_main() directly instead of relying on import
side-effects.
diff --git a/Lib/test/test_sunaudiodev.py b/Lib/test/test_sunaudiodev.py
index 3750542..470fff8 100644
--- a/Lib/test/test_sunaudiodev.py
+++ b/Lib/test/test_sunaudiodev.py
@@ -22,7 +22,11 @@
         a.write(data)
         a.close()
 
-def test():
+
+def test_main():
     play_sound_file(findfile('audiotest.au'))
 
-test()
+
+
+if __name__ == '__main__':
+    test_main()