Add workaround for intermittent test failures

tests/filters.js

@@ -2,6 +2,8 @@ describe('Filters', function() {
 
     let $filter;
 
+    beforeAll(() => window.onbeforeunload = () => 'Ignoring page reload request');
+
     beforeEach(function() {
 
         // Load 3ema.filters module

tests/helpers.js

@@ -1,6 +1,9 @@
 describe('Helpers', function () {
+
     let stringService;
 
+    beforeAll(() => window.onbeforeunload = () => 'Ignoring page reload request');
+
     beforeEach(function () {
             // Load 3ema.services
         module('3ema.services');

tests/qrcode.js

@@ -2,6 +2,8 @@ describe('QrCodeService', function() {
 
     let $service;
 
+    beforeAll(() => window.onbeforeunload = () => 'Ignoring page reload request');
+
     beforeEach(function() {
 
         module(($provide) => {

tests/service/message.js

@@ -2,6 +2,8 @@ describe('MessageService', function() {
 
     let messageService;
 
+    beforeAll(() => window.onbeforeunload = () => 'Ignoring page reload request');
+
     beforeEach(function() {
 
         // load threema services