Saimadhav Heblikar added the comment:

It was WidgetRedirector which was leaking.
cls.percolator.redir.close() added in tearDownClass fixes the leak.
saimadhav@debian:~/dev/34-cpython$ ./python -m test -R :: -uall test_idle 
[1/1] test_idle
beginning 9 repetitions
123456789
.........
1 test OK.

The attached patch also ensures that when UndoDelegator.py is run, unittest is 
called with exit=False, so that htest is run.
The htest display is also corrected, and works the same way as without 
unittest.(with correct buttons etc).

Only problem remaining is when UndoDelegator is run,


can't invoke "event" command:  application has been destroyed
    while executing
"event generate $w <<ThemeChanged>>"
    (procedure "ttk::ThemeChanged" line 6)
    invoked from within
"ttk::ThemeChanged"

----------
Added file: 
http://bugs.python.org/file35564/test-undodelegator-refleak-fixed.diff

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