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Actually, there is a 'fix' which is really a work-around the
problem.  You can disable os.openpty() in pty.master_open. 
I added a raise OSError at line 50 (before os.openpty()). 
This allows the test to pass.  I think Martin and I agreed
that globally disabling wasn't the best solution.  That
would probably be in some patch.

Also, just in case it isn't clear--if you run test_pty
BEFORE test_openpty, both tests pass.