unit test for init contextmenu added

frontend-js/src/main/js/gui/MapContextMenu.js

@@ -26,7 +26,13 @@ MapContextMenu.prototype._createMapContextMenuGui = function() {
   self.addOption("Select mode", function() {
     return self.getMap().turnOnOffDrawing();
   });
+};
 
+MapContextMenu.prototype.init = function() {
+  var self = this;
+  return self.createExportAsImageSubmenu().then(function(submenu){
+    self.addOption(submenu);
+  });
 };
 
 module.exports = MapContextMenu;

frontend-js/src/test/js/gui/MapContextMentu-test.js

@@ -30,6 +30,16 @@ describe('MapContextMenu', function() {
     assert.equal(logger.getWarnings().length, 0);
   });
 
+  it('init', function() {
+    var map = helper.createCustomMap();
+
+    var menu = new MapContextMenu({
+      element : testDiv,
+      customMap : map
+    });
+    return menu.init();
+  });
+
   it('open comment dialog', function() {
     var map;
     return ServerConnector.getProject().then(function(project) {