add test script for "udp in" node (#1466)

* add test script for "udp in" node

* use old socket.send API for Node4.X compatibility

test/nodes/core/io/32-udpin_spec.js

@@ -0,0 +1,93 @@
+/**
+ * Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * 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.
+ **/
+
+var dgram = require("dgram");
+var should = require("should");
+var helper = require("../../helper.js");
+var udpNode = require("../../../../nodes/core/io/32-udp.js");
+
+
+describe('UDP in Node', function() {
+    var port = 9100;
+
+    before(function(done) {
+        helper.startServer(done);
+    });
+
+    after(function() {
+    });
+
+    afterEach(function() {
+        helper.unload();
+    });
+
+    function sendIPv4(msg) {
+        var sock = dgram.createSocket('udp4');
+        sock.send(msg, 0, msg.length, port, "127.0.0.1", function(msg) {
+            sock.close();
+        });
+    }
+
+    function checkRecv(dt, proto, val0, val1, done) {
+        var flow = [{id:"n1", type:"udp in",
+                     group: "", multicast:false,
+                     port:port, ipv:proto,
+                     datatype: dt, iface: "",
+                     wires:[["n2"]] },
+                    {id:"n2", type:"helper"}];
+        helper.load(udpNode, flow, function() {
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {
+                try {
+                    var ip = ((proto === 'udp6') ? '::ffff:':'') +'127.0.0.1';
+                    msg.should.have.property('ip', ip);
+                    msg.should.have.property('port');
+                    msg.should.have.property('payload');
+                    msg.payload.should.deepEqual(val1);
+                    done();
+                } catch(err) {
+                    done(err);
+                }
+            });
+            sendIPv4(val0);
+        });
+    }
+    
+    it('should recv IPv4 data (Buffer)', function(done) {
+        checkRecv('buffer', 'udp4', 'hello', Buffer('hello'), done);
+    });
+
+    it('should recv IPv4 data (String)', function(done) {
+        checkRecv('utf8', 'udp4', 'hello', 'hello', done);
+    });
+
+    it('should recv IPv4 data (base64)', function(done) {
+        checkRecv('base64', 'udp4', 'hello', Buffer('hello').toString('base64'), done);
+    });
+
+    it('should recv IPv6 data (Buffer)', function(done) {
+        checkRecv('buffer', 'udp6', 'hello', Buffer('hello'), done);
+    });
+
+    it('should recv IPv6 data (String)', function(done) {
+        checkRecv('utf8', 'udp6', 'hello', 'hello', done);
+    });
+
+    it('should recv IPv6 data (base64)', function(done) {
+        checkRecv('base64', 'udp6', 'hello', Buffer('hello').toString('base64'), done);
+    });
+
+});