fix(SenderLink): use defaultSubject from policy, added test

lib/sender_link.js

@@ -66,7 +66,7 @@ SenderLink.prototype.send = function(msg, options) {
   if (!!this.policy.defaultSubject) {
     if (!options.properties) options.properties = {};
     if (!options.properties.subject)
-      options.properties.subject = this.defaultSubject;
+      options.properties.subject = this.policy.defaultSubject;
   }
 
   var self = this;

test/integration/qpid/receiver_link.test.js

@@ -26,7 +26,7 @@ describe('ReceiverLink', function() {
         return Promise.all([
           test.client.createReceiver('amq.topic/not-news'),
           test.client.createReceiver('amq.topic/news'),
-          test.client.createSender('amq.topic/news')
+          test.client.createSender('amq.topic')
         ]);
       })
       .spread(function(receiverWithoutSubject, receiverWithSubject, sender) {

test/integration/qpid/sender_link.test.js

@@ -0,0 +1,46 @@
+'use strict';
+var AMQPClient = require('../../..').Client,
+    c = require('../../../').Constants,
+    Promise = require('bluebird'),
+    config = require('./config'),
+    expect = require('chai').expect;
+
+var test = {};
+describe('QPID', function() {
+
+describe('SenderLink', function() {
+  beforeEach(function() {
+    if (!!test.client) test.client = undefined;
+    test.client = new AMQPClient();
+  });
+
+  afterEach(function() {
+    return test.client.disconnect().then(function() {
+      test.client = undefined;
+    });
+  });
+
+  it('should allow the definition of a default subject', function(done) {
+    return test.client.connect(config.address)
+      .then(function() {
+        return Promise.all([
+          test.client.createReceiver('amq.topic/not-news'),
+          test.client.createReceiver('amq.topic/news'),
+          test.client.createSender('amq.topic/news')
+        ]);
+      })
+      .spread(function(receiverWithoutSubject, receiverWithSubject, sender) {
+        receiverWithoutSubject.on('message', function(message) {
+          expect(message).to.not.exist;
+        });
+
+        receiverWithSubject.on('message', function(message) {
+          done();
+        });
+
+        return sender.send('test message');
+      });
+  });
+
+});
+});