Add some tests for the ping feature.

spec/ping.js

+/*global converse */
+(function (root, factory) {
+    define([
+        "jquery",
+        "mock",
+        "test_utils",
+        "converse-ping"
+        ], function ($, mock, test_utils) {
+            return factory($, mock, test_utils);
+        }
+    );
+} (this, function ($, mock, test_utils) {
+    "use strict";
+
+    describe("XMPP Ping", $.proxy(function (mock, test_utils) {
+        describe("Ping and pong handlers", $.proxy(function (mock, test_utils) {
+            it("are registered when converse.js is initialized", $.proxy(function () {
+                spyOn(converse, 'registerPingHandler').andCallThrough();
+                spyOn(converse, 'registerPongHandler').andCallThrough();
+                converse._initialize();
+                expect(converse.registerPingHandler).toHaveBeenCalled();
+                expect(converse.registerPongHandler).toHaveBeenCalled();
+            }, converse, mock, test_utils));
+        }));
+
+        describe("An IQ stanza", $.proxy(function (mock, test_utils) {
+            it("is sent out when converse.js pings a server", function () {
+                var sent_stanza, IQ_id;
+                var sendIQ = converse.connection.sendIQ;
+                spyOn(converse.connection, 'sendIQ').andCallFake(function (iq, callback, errback) {
+                    sent_stanza = iq;
+                    IQ_id = sendIQ.bind(this)(iq, callback, errback);
+                });
+                converse.ping();
+                expect(sent_stanza.toLocaleString()).toBe(
+                    "<iq type='get' to='localhost' id='"+IQ_id+"' xmlns='jabber:client'>"+
+                        "<ping xmlns='urn:xmpp:ping'/>"+
+                    "</iq>");
+            });
+        }));
+    }, converse, mock, test_utils));
+}));

tests/main.js

@@ -71,6 +71,7 @@ require([
                 "spec/chatroom",
                 "spec/minchats",
                 "spec/profiling",
+                "spec/ping",
                 "spec/register",
                 "spec/xmppstatus"
             ], function () {