fix #1408 Allowing the robot not to be available immediately (waits f…

…or 2s)

Sometimes, if the first test to be executed by a browser is a robot test,
it can fail with the error "The robot is not available." even if the
browser was started with selenium-java-robot because selenium-java-robot
has not yet injected the SeleniumJavaRobot object in the page.

This commit makes sure we wait up to 2s before raising the error that the
robot is not available.

src/aria/jsunit/$RobotSelection.js

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2015 Amadeus s.a.s.
+ * 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 Promise = require("noder-js/promise");
+var Aria = require("../Aria");
+var computedRobotClasspath = null;
+
+var waitTimeLimit = new Date().getTime() + 2000; // waits max 2s
+
+var computeRobotClasspath = function () {
+    if (Aria.$frameworkWindow.top.phantomJSRobot) {
+        return "aria.jsunit.RobotPhantomJS";
+    }
+    if (Aria.$frameworkWindow.top.SeleniumJavaRobot) {
+        return "aria.jsunit.RobotJavaSelenium";
+    }
+    return null;
+};
+
+var initialization = new Promise(function (resolve) {
+    var check = function () {
+        computedRobotClasspath = computeRobotClasspath();
+        if (computedRobotClasspath || new Date().getTime() > waitTimeLimit) {
+            resolve();
+        } else {
+            setTimeout(check, 100);
+        }
+    };
+    check();
+});
+
+var getRobotClasspath = exports.getRobotClasspath = function () {
+    return computedRobotClasspath;
+};
+
+getRobotClasspath.$preload = function () {
+    return initialization;
+};

src/aria/jsunit/Robot.js

@@ -13,6 +13,7 @@
  * limitations under the License.
  */
 var Aria = require("../Aria");
+var robotClasspath = require("./$RobotSelection").getRobotClasspath();
 
 /**
  * This class is still experimental, its interface may change without notice. This class gives access to a robot
@@ -43,13 +44,7 @@ module.exports = Aria.classDefinition({
          * @return {String}
          */
         getRobotClasspath : function () {
-            if (Aria.$frameworkWindow.top.phantomJSRobot) {
-                return "aria.jsunit.RobotPhantomJS";
-            }
-            if (Aria.$frameworkWindow.top.SeleniumJavaRobot) {
-                return "aria.jsunit.RobotJavaSelenium";
-            }
-            return null;
+            return robotClasspath;
         },
 
         /**
@@ -68,7 +63,6 @@ module.exports = Aria.classDefinition({
             if (this.robot) {
                 this.robot.initRobot(cb);
             } else {
-                var robotClasspath = this.getRobotClasspath();
                 if (!robotClasspath) {
                     this.$logError(this.ROBOT_UNAVAILABLE);
                     return;
@@ -79,7 +73,6 @@ module.exports = Aria.classDefinition({
                         fn : this._robotLoaded,
                         scope : this,
                         args : {
-                            robotClasspath : robotClasspath,
                             cb : cb
                         }
                     }
@@ -93,7 +86,7 @@ module.exports = Aria.classDefinition({
          */
         _robotLoaded : function (args) {
             if (!this.robot) {
-                this.robot = Aria.getClassRef(args.robotClasspath).$interface("aria.jsunit.IRobot");
+                this.robot = Aria.getClassRef(robotClasspath).$interface("aria.jsunit.IRobot");
             }
             this.robot.initRobot(args.cb);
         }