added getTestBalance function

Author: abdulsuhail

lib/mapping.js

@@ -782,6 +782,11 @@ var commands = {
     options: [options.request,options.apikey],
     info: 'list locations and the number of pending tests'
   },
+  'testBalance': {
+    name: 'getTestBalance',
+    options: [options.request,options.apikey],
+    info: 'get remaining tests for the account'
+  },
   'testers': {
     name: 'getTesters',
     options: [options.request],

lib/webpagetest.js

@@ -24,6 +24,7 @@ var paths = {
   testResults: 'jsonResult.php',
   locations: 'getLocations.php',
   testers: 'getTesters.php',
+  testBalance: 'testBalance.php',
   test: 'runtest.php',
   gzip: 'getgzip.php',
   har: 'export.php',
@@ -315,6 +316,17 @@ function getTesters(options, callback) {
   return api.call(this, paths.testers, callback, query, options);
 }
 
+function getTestBalance(options, callback) {
+  callback = callback || options;
+  options = options === callback ? undefined : options;
+
+  var query = helper.setQuery(mapping.commands.testBalance, options);
+  if (!query.k && this.config.key) {
+    query.k = this.config.key;
+  }
+  return api.call(this, paths.testBalance, callback, query, options);
+}
+
 function runTest(what, options, callback) {
   var query = {};
 
@@ -778,6 +790,7 @@ WebPageTest.prototype = {
   restartTest: restartTest,
   cancelTest: cancelTest,
   getPageSpeedData: getPageSpeedData,
+  getTestBalance : getTestBalance,
   getHARData: getHARData,
   getUtilizationData: getUtilizationData,
   getRequestData: getRequestData,