unit test fixed

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

@@ -2,7 +2,6 @@
 
 require("../mocha-config");
 
-var InvalidArgumentError = require('../../../main/js/InvalidArgumentError');
 var Plugin = require('../../../main/js/plugin/Plugin');
 var PluginManager = require('../../../main/js/plugin/PluginManager');
 var ProxyAccessPlugin = require('./ProxyAccessPlugin');
@@ -91,7 +90,7 @@ describe('PluginManager', function () {
     });
     it('valid', function () {
       var manager = new PluginManager(createParams());
-      assert.ok("http://onet.pl/");
+      assert.ok(manager.isValidUrl("http://onet.pl/"));
     });
   });