doctest in Pythonwin

[Terry Reedy]

Running the following boilerplate from the library docs

#doctesttest.py

def _test():
    import doctest, doctesttest
    doctest.testmod(doctesttest)

if __name__ == '__main__':
    _test()

gives the following output instead of the nothing promised by the docs

>>> *** Tester.merge: 'doctesttest' in both testers; summing outcomes.

For one file, I also got similar lines for each function, but have not
yet discerned the rule.  Is this an unavoidable peculiarity of running
doctest in this environment?

Terry J. Reedy