add unit tests for Message encode and decode

.gitignore

@@ -213,3 +213,9 @@ pip-log.txt
 
 #Mr Developer
 .mr.developer.cfg
+
+
+#############
+## PyCharm
+#############
+.idea

iot/coap.py

@@ -277,7 +277,7 @@ def decode(cls, rawdata, remote=None, protocol=None):
         (vttkl, code, mid) = struct.unpack('!BBH', rawdata[:4])
         version = (vttkl & 0xC0) >> 6
         if version is not 1:
-            raise Exception()
+            raise ValueError("Fatal Error: Protocol Version must be 1")
         mtype = (vttkl & 0x30) >> 4
         token_length = (vttkl & 0x0F)
         msg = Message(mtype=mtype, mid=mid, code=code)
@@ -289,6 +289,8 @@ def decode(cls, rawdata, remote=None, protocol=None):
 
     def encode(self):
         """Create binary representation of message from Message object."""
+        if self.mtype is None or self.mid is None:
+            raise TypeError("Fatal Error: Message Type and Message ID must not be None.")
         rawdata = chr((self.version << 6) + ((self.mtype & 0x03) << 4) + (len(self.token) & 0x0F))
         rawdata += struct.pack('!BH', self.code, self.mid)
         rawdata += self.token
@@ -1236,6 +1238,7 @@ def sendResponse(self, response, request):
         #if isResponse(response.code) is False:
             #raise ValueError("Message code is not valid for a response.")
         response.token = request.token
+        print "Token: %s" % (response.token)
         response.remote = request.remote
         if request.opt.block1 is not None:
             response.opt.block1 = request.opt.block1

iot/test/test_coap.py

@@ -7,6 +7,36 @@
 import iot.coap as coap
 import struct
 
+class TestMessage(unittest.TestCase):
+
+    def test_encode(self):
+        msg1 = coap.Message(mtype=coap.CON, mid=0)
+        binary1 = chr(64)+chr(0)+chr(0)+chr(0)
+        self.assertEqual(msg1.encode(), binary1, "wrong encode operation for empty CON message")
+
+        msg2 = coap.Message(mtype=coap.ACK, mid=0xBC90, code=coap.CONTENT, payload="temp = 22.5 C", token='q')
+        msg2.opt.etag = "abcd"
+        binary2 = chr(97)+chr(69)+chr(188)+chr(144)+chr(113)+chr(68)+"abcd"+chr(255)+"temp = 22.5 C"
+        self.assertEqual(msg2.encode(), binary2, "wrong encode operation for ACK message with payload, and Etag option")
+
+        msg3 = coap.Message()
+        self.assertRaises(TypeError, msg3.encode)
+
+    def test_decode(self):
+        rawdata1 = chr(64)+chr(0)+chr(0)+chr(0)
+        self.assertEqual(coap.Message.decode(rawdata1).mtype, coap.CON, "wrong message type for decode operation")
+        self.assertEqual(coap.Message.decode(rawdata1).mid, 0, "wrong message ID for decode operation")
+        self.assertEqual(coap.Message.decode(rawdata1).code, coap.EMPTY, "wrong message code for decode operation")
+        self.assertEqual(coap.Message.decode(rawdata1).token, '', "wrong message token for decode operation")                                                    
+        self.assertEqual(coap.Message.decode(rawdata1).payload, '', "wrong message payload for decode operation")   
+        rawdata2 = chr(97)+chr(69)+chr(188)+chr(144)+chr(113)+chr(68)+"abcd"+chr(255)+"temp = 22.5 C"
+        self.assertEqual(coap.Message.decode(rawdata2).mtype, coap.ACK, "wrong message type for decode operation")
+        self.assertEqual(coap.Message.decode(rawdata2).mid, 0xBC90, "wrong message ID for decode operation")
+        self.assertEqual(coap.Message.decode(rawdata2).code, coap.CONTENT, "wrong message code for decode operation")
+        self.assertEqual(coap.Message.decode(rawdata2).token, 'q', "wrong message token for decode operation")                                                    
+        self.assertEqual(coap.Message.decode(rawdata2).payload, 'temp = 22.5 C', "wrong message payload for decode operation")
+        self.assertEqual(coap.Message.decode(rawdata2).opt.etags, ["abcd"], "problem with etag option decoding for decode operation")  
+        self.assertEqual(len(coap.Message.decode(rawdata2).opt._options), 1, "wrong number of options after decode operation")
 
 class TestReadExtendedFieldValue(unittest.TestCase):
 
@@ -110,4 +140,4 @@ def test_setUriPath(self):
         opt3 = coap.Options()
         self.assertRaises(ValueError, setattr, opt3, "uri_path", "core")
 
-                
+