test_zebra: Unit tests for Zebra packet library

The pcap files for Zebra protocol were generated by:
  v2: Quagga 0.99.24.1 (Ubuntu 14.04 LST packaged version)
  v3: Quagga 1.1.0 (from Git source)

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/tests/unit/packet/test_zebra.py

@@ -0,0 +1,66 @@
+# Copyright (C) 2017 Nippon Telegraph and Telephone Corporation.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+
+import os
+import sys
+import unittest
+
+from nose.tools import eq_
+from nose.tools import ok_
+import six
+
+from ryu.lib import pcaplib
+from ryu.lib.packet import packet
+from ryu.lib.packet import zebra
+from ryu.utils import binary_str
+
+
+PCAP_DATA_DIR = os.path.join(
+    os.path.dirname(sys.modules[__name__].__file__),
+    '../../packet_data/pcap/')
+
+
+class Test_zebra(unittest.TestCase):
+    """
+    Test case for ryu.lib.packet.zebra.
+    """
+
+    def test_pcap(self):
+        files = [
+            'zebra_v2',
+            'zebra_v3',
+        ]
+
+        for f in files:
+            zebra_pcap_file = os.path.join(PCAP_DATA_DIR, f + '.pcap')
+            # print('*** testing %s' % zebra_pcap_file)
+
+            for _, buf in pcaplib.Reader(open(zebra_pcap_file, 'rb')):
+                # Checks if Zebra message can be parsed as expected.
+                pkt = packet.Packet(buf)
+                zebra_pkts = pkt.get_protocols(zebra.ZebraMessage)
+                for zebra_pkt in zebra_pkts:
+                    ok_(isinstance(zebra_pkt, zebra.ZebraMessage),
+                        'Failed to parse Zebra message: %s' % pkt)
+                ok_(not isinstance(pkt.protocols[-1],
+                                   (six.binary_type, bytearray)),
+                    'Some messages could not be parsed: %s' % pkt)
+
+                # Checks if Zebra message can be serialized as expected.
+                pkt.serialize()
+                eq_(buf, pkt.data,
+                    "b'%s' != b'%s'" % (binary_str(buf), binary_str(pkt.data)))