How to use the ncclient.capabilities.Capabilities function in ncclient

def test_get_config_with_defaults(self, mock_request):
        session = ncclient.transport.SSHSession(self.device_handler)
        session._server_capabilities = Capabilities([
            "urn:ietf:params:netconf:capability:with-defaults:1.0"
            "?basic-mode=explicit"
        ])
        obj = GetConfig(session, self.device_handler, raise_mode=RaiseMode.ALL)
        source = 'candidate'
        obj.request(source, with_defaults='explicit')

        expected_xml = etree.fromstring(
            ''
            ''
            'explicit'
            ''.format(
                base=BASE_NS_1_0,
                defaults=NETCONF_WITH_DEFAULTS_NS
            )
        )

def test_rpc_async(self, mock_thread, mock_send):
        device_handler = manager.make_device_handler({'name': 'junos'})
        capabilities = Capabilities(device_handler.get_capabilities())
        session = ncclient.transport.Session(capabilities)
        obj = RPC(
            session,
            device_handler,
            raise_mode=RaiseMode.ALL,
            timeout=0,
            async_mode=True)
        reply = RPCReply(xml1)
        obj._reply = reply
        node = new_ele("commit")
        result = obj._request(node)
        self.assertEqual(result, obj)

def test_get_with_defaults_not_supported(self, mock_request):
        session = ncclient.transport.SSHSession(self.device_handler)
        session._server_capabilities = Capabilities([
            "urn:ietf:params:netconf:capability:with-defaults:1.0"
            "?basic-mode=explicit"
            "&also-supported=report-all,trim"
        ])
        obj = Get(session, self.device_handler, raise_mode=RaiseMode.ALL)

        expected_error = (
            "Invalid 'with-defaults' mode 'report-all-tagged'; the server "
            "only supports the following: explicit, report-all, trim"
        )
        self.assertRaisesRegexp(
            WithDefaultsError,
            expected_error,
            obj.request,
            with_defaults='report-all-tagged'
        )

def test_rpc_timeout_error(self, mock_thread, mock_send):
        device_handler = manager.make_device_handler({'name': 'junos'})
        capabilities = Capabilities(device_handler.get_capabilities())
        session = ncclient.transport.Session(capabilities)
        obj = RPC(session, device_handler, raise_mode=RaiseMode.ALL, timeout=0)
        reply = RPCReply(xml1)
        obj.deliver_reply(reply)
        node = new_ele("commit")
        sub_ele(node, "confirmed")
        mock_thread.return_value = False
        self.assertRaises(TimeoutExpiredError, obj._request, node)

def test_get_with_defaults_missing_capability(self, mock_request):
        session = ncclient.transport.SSHSession(self.device_handler)
        session._server_capabilities = Capabilities([])
        obj = Get(session, self.device_handler, raise_mode=RaiseMode.ALL)
        self.assertRaises(
            MissingCapabilityError,
            obj.request,
            with_defaults='report-all'
        )

def test_get_with_defaults_also_supported(self, mock_request):
        session = ncclient.transport.SSHSession(self.device_handler)
        session._server_capabilities = Capabilities([
            "urn:ietf:params:netconf:capability:with-defaults:1.0"
            "?basic-mode=explicit"
            "&also-supported=report-all,trim"
        ])
        obj = Get(session, self.device_handler, raise_mode=RaiseMode.ALL)
        obj.request(with_defaults='report-all')

        expected_xml = etree.fromstring(
            ''
            'report-all'
            ''.format(
                base=BASE_NS_1_0,
                defaults=NETCONF_WITH_DEFAULTS_NS
            )
        )

def test_get_with_defaults_basic_mode(self, mock_request):
        session = ncclient.transport.SSHSession(self.device_handler)
        session._server_capabilities = Capabilities([
            "urn:ietf:params:netconf:capability:with-defaults:1.0"
            "?basic-mode=explicit"
        ])
        obj = Get(session, self.device_handler, raise_mode=RaiseMode.ALL)
        obj.request(with_defaults='explicit')

        expected_xml = etree.fromstring(
            ''
            'explicit'
            ''.format(
                base=BASE_NS_1_0,
                defaults=NETCONF_WITH_DEFAULTS_NS
            )
        )

        call = mock_request.call_args_list[0][0][0]

def parse(raw):
        "Returns tuple of (session-id (str), capabilities (Capabilities)"
        sid, capabilities = 0, []
        root = to_ele(raw)
        for child in root.getchildren():
            if child.tag == qualify("session-id") or child.tag == "session-id":
                sid = child.text
            elif child.tag == qualify("capabilities") or child.tag == "capabilities" :
                for cap in child.getchildren():
                    if cap.tag == qualify("capability") or cap.tag == "capability":
                        capabilities.append(cap.text)
        return sid, Capabilities(capabilities)

def parse(raw):
        "Returns tuple of (session-id (str), capabilities (Capabilities)"
        sid, capabilities = 0, []
        root = to_ele(raw)
        for child in root.getchildren():
            if child.tag == qualify("session-id") or child.tag == "session-id":
                sid = child.text
            elif child.tag == qualify("capabilities") or child.tag == "capabilities" :
                for cap in child.getchildren():
                    if cap.tag == qualify("capability") or cap.tag == "capability":
                        capabilities.append(cap.text)
        return sid, Capabilities(capabilities)