'Test invoking start_new_thread() with a function that raises
SystemExit.
The exception should be discarded.'

def test_SystemExit(self):

    func = mock.Mock(side_effect=SystemExit())
    try:
        _thread.start_new_thread(func, tuple())
    except SystemExit:
        self.fail('start_new_thread    raised    SystemExit.')
