missing jquery added

frontend-js/src/main/js/plugin/MinervaPluginProxy.js

 "use strict";
 
+var $ = require('jquery');
+
 var Annotation = require('../map/data/Annotation');
 var Chemical = require('../map/data/Chemical');
 var Drug = require('../map/data/Drug');

frontend-js/src/test/js/plugin/Plugin-test.js

 "use strict";
 
 require("../mocha-config");
+var $ = require('jquery');
 
 // noinspection JSUnusedLocalSymbols
 var Promise = require("bluebird");
@@ -48,13 +49,16 @@ describe('Plugin', function () {
   it('test plugins', function () {
     var promises = [];
 
+    global.$ = $;
     fs.readdirSync('./testFiles/plugin/').forEach(function (file) {
       var element = document.createElement("div");
       testDiv.appendChild(element);
       var plugin = createPlugin("./testFiles/plugin/" + file);
       promises.push(plugin.load());
     });
-    return Promise.all(promises);
+    return Promise.all(promises).finally(function () {
+      global.$ = undefined;
+    });
   });
 
   describe('load', function () {

frontend-js/src/test/js/plugin/PluginManager-test.js

 "use strict";
 
 require("../mocha-config");
+var $ = require('jquery');
 
 var Plugin = require('../../../main/js/plugin/Plugin');
 var PluginManager = require('../../../main/js/plugin/PluginManager');