jio ajax: allow to set a request timeout value

src/jio.js

@@ -40,6 +40,7 @@
    * @param  {String} [param.dataType=""] The data type to retrieve
    * @param  {String} param.url The url
    * @param  {Any} [param.data] The data to send
+   * @param  {Number} param.timeout The request timeout value
    * @param  {Function} [param.beforeSend] A function called just before the
    *    send request. The first parameter of this function is the XHR object.
    * @return {Promise} The promise
@@ -72,6 +73,12 @@
           }
         }
       }
+      if (param.timeout !== undefined && param.timeout !== 0) {
+        xhr.timeout = param.timeout;
+        xhr.ontimeout = function () {
+          return reject(new jIO.util.jIOError("Gateway Timeout", 504));
+        };
+      }
       if (typeof param.beforeSend === 'function') {
         param.beforeSend(xhr);
       }

test/jio/util.js

-(function (jIO, QUnit) {
+/*global setTimeout*/
+(function (jIO, QUnit, setTimeout) {
   "use strict";
   var test = QUnit.test,
     equal = QUnit.equal,
+    stop = QUnit.stop,
+    start = QUnit.start,
+    expect = QUnit.expect,
     module = QUnit.module;
 
   /////////////////////////////////////////////////////////////////
@@ -29,4 +33,47 @@
 
   });
 
-}(jIO, QUnit));
\ No newline at end of file
+  /////////////////////////////////////////////////////////////////
+  // util.ajax
+  /////////////////////////////////////////////////////////////////
+  module("util.ajax", {
+    setup: function () {
+      var context = this;
+
+      this.jioerror = jIO.util.jIOError;
+      this.error_spy = {};
+      function fakejIOError(message, status_code) {
+        context.error_spy.message = message;
+        context.error_spy.status_code = status_code;
+      }
+      fakejIOError.prototype = new Error();
+      fakejIOError.prototype.constructor = fakejIOError;
+      jIO.util.jIOError = fakejIOError;
+    },
+
+    teardown: function () {
+      jIO.util.jIOError = this.jioerror;
+    }
+  });
+
+  test("ajax timeout", function () {
+    var timeout = 1,
+      context = this;
+
+    stop();
+    expect(2);
+
+    jIO.util.ajax({
+      type: 'GET',
+      url: "//www.foo/com/bar",
+      timeout: timeout
+    });
+
+    setTimeout(function () {
+      start();
+      equal(context.error_spy.message, "Gateway Timeout");
+      equal(context.error_spy.status_code, 504);
+    }, 10);
+
+  });
+}(jIO, QUnit, setTimeout));
\ No newline at end of file