test_openflow: Add unit tests for OpenFlow packet library

Signed-off-by: Shinpei Muraoka <shinpei.muraoka@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/tests/unit/packet/test_openflow.py

@@ -0,0 +1,64 @@
+# 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 logging
+import os
+import sys
+
+import unittest
+from nose.tools import eq_
+from nose.tools import ok_
+
+from ryu.lib import pcaplib
+from ryu.lib.packet import openflow
+from ryu.lib.packet import packet
+from ryu.utils import binary_str
+
+
+LOG = logging.getLogger(__name__)
+
+OPENFLOW_DATA_DIR = os.path.join(
+    os.path.dirname(sys.modules[__name__].__file__),
+    '../../packet_data/pcap/')
+
+
+class Test_openflow(unittest.TestCase):
+    """
+    Test case for ryu.lib.packet.openflow.
+    """
+
+    def test_pcap(self):
+        files = [
+            'openflow_flowmod',
+            'openflow_flowstats_req',
+            'openflow_invalid_version',
+        ]
+
+        for f in files:
+            # print('*** testing %s ...' % f)
+            for _, buf in pcaplib.Reader(
+                    open(OPENFLOW_DATA_DIR + f + '.pcap', 'rb')):
+                # Checks if message can be parsed as expected.
+                pkt = packet.Packet(buf)
+                openflow_pkt = pkt.get_protocol(openflow.openflow)
+                ok_(isinstance(openflow_pkt, openflow.openflow),
+                    'Failed to parse OpenFlow message: %s' % pkt)
+
+                # Checks if message can be serialized as expected.
+                pkt.serialize()
+                eq_(buf, pkt.data,
+                    "b'%s' != b'%s'" % (binary_str(buf), binary_str(pkt.data)))