human
I wrote the below code

    non_bad = good_certificate_name
    if (non_bad == 'control_dns'):
        non_bad = 'control'
    (bad_name, another_bad_name) = {'user', 'node', 'control'}.difference({non_bad})
    class ValidationTests(AsyncTestCase, ):
        "\n                                Tests    to    ensure    correct    validation    of    a    specific    type    of    certificate.\n\n                                :ivar    CertificateSet    good_ca:    The    certificates    for    the    CA    we    expect.\n\n                                :ivar    CertificateSet    another_ca:    A    different    CA's    certificates.\n                                "
        def setUp(self):
            super(ValidationTests, self).setUp()
            (self.good_ca, self.another_ca) = get_credential_sets()
        def _handshake(self, credential):
            '\n                                                Run    a    TLS    handshake    between    a    client    and    server,    one    of    which    is\n                                                using    the    validation    logic    and    the    other    the    given    credential.\n\n                                                :param    credential:    The    high-level    credential    to    use.\n\n                                                :return    ``Deferred``:    Fires    when    handshake    succeeded    or\n                                                                failed.\n                                                '
            peer_context_factory = PeerContextFactory(credential.credential)
            port = find_free_port()[1]
            validating_context_factory = context_factory_fixture(port, self.good_ca)
            if validator_is_client:
                client_context_factory = validating_context_factory
                server_context_factory = peer_context_factory
            else:
                server_context_factory = validating_context_factory
                client_context_factory = peer_context_factory
           ...

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def make_validation_tests(context_factory_fixture, good_certificate_name, validator_is_client):