R. David Murray added the comment:

There are always going to be tests that are skipped (ones that don't run on 
your platform).

Most of test_socket should run even if all you have is localhost networking. 
The 'network' resource is designed to control access to *external* networking 
resources, and there is at least one specific test in test_socket that is 
protected by the resource.  

I always run the test suite using '-uall' myself, which enables all the 
resources except for the ones that take lots of memory or disk space. If you 
have built python from source/checkout, then you can run the test suite using:

  ./python.exe -m test -uall

For investigating this failure, you should change the beginning of 
test_host_resolution from:

    for addr in ['0.1.1.~1', '1+.1.1.1', '::1q', '::1::2',
                 '1:1:1:1:1:1:1:1:1']:
        self.assertRaises(OSError, socket.gethostbyname, addr)
        self.assertRaises(OSError, socket.gethostbyaddr, addr)

to:

    for addr in ['0.1.1.~1', '1+.1.1.1', '::1q', '::1::2',
                 '1:1:1:1:1:1:1:1:1']:
        for func in socket.gethostbyname, socket.gethostbyaddr:
            with self.subTest(addr=addr, func=func):
                self.assertRaises(OSError, func, addr)

and report the results.

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23761>
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