def METHOD_NAME(self):
    """
    L{NameVirtualHost.render} returns the result of rendering the
    instance's C{default} if it is not L{None} and there is no I{Host}
    header in the request.
    """
    virtualHostResource = NameVirtualHost()
    virtualHostResource.default = Data(b"correct result", "")
    request = DummyRequest([b""])
    self.assertEqual(virtualHostResource.render(request), b"correct result")