diff --git a/resources/assets/src/js/__tests__/admin.test.js b/resources/assets/src/js/__tests__/admin.test.js
index 9fa43f37..d59bbf11 100644
--- a/resources/assets/src/js/__tests__/admin.test.js
+++ b/resources/assets/src/js/__tests__/admin.test.js
@@ -8,6 +8,7 @@ describe('tests for "customize" module', () => {
 
   it('change skin preview after switching color', () => {
     window.current_skin = 'skin-blue';
+    window.showAjaxError = jest.fn();
     document.body.className = window.current_skin;
     document.body.innerHTML = `
       <div id="layout-skins-list">
@@ -35,6 +36,7 @@ describe('tests for "customize" module', () => {
     window.url = url;
     window.toastr = toastr;
     window.current_skin = '';
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = '<button id="color-submit">submit</button>';
     const submitColor = require(modulePath);
@@ -69,6 +71,7 @@ describe('tests for "players" module', () => {
     window.fetch = fetch;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div id="1">
@@ -111,6 +114,7 @@ describe('tests for "players" module', () => {
     window.url = url;
     window.toastr = toastr;
     window.$.fn.modal = modal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div class="modal" style="display: none" id="shouldBeRemoved"></div>
@@ -157,6 +161,7 @@ describe('tests for "players" module', () => {
     window.toastr = toastr;
     window.trans = trans;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -208,6 +213,7 @@ describe('tests for "players" module', () => {
     window.trans = trans;
     window.swal = swal;
     window.debounce = debounce;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -263,6 +269,7 @@ describe('tests for "players" module', () => {
     window.toastr = toastr;
     window.trans = trans;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -310,6 +317,7 @@ describe('tests for "plugins" module', () => {
     window.fetch = fetch;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
     $.pluginsTable = {
       ajax: {
         reload: reloadTable
@@ -345,6 +353,7 @@ describe('tests for "plugins" module', () => {
     window.fetch = fetch;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
     $.pluginsTable = {
       ajax: {
         reload: reloadTable
@@ -380,6 +389,7 @@ describe('tests for "plugins" module', () => {
     window.fetch = fetch;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
     $.pluginsTable = {
       ajax: {
         reload: reloadTable
@@ -423,6 +433,7 @@ describe('tests for "update" module', () => {
     window.fetch = fetch;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
     $.fn.modal = modal;
 
     document.body.innerHTML = `
@@ -470,6 +481,7 @@ describe('tests for "users" module', () => {
     window.toastr = toastr;
     window.trans = trans;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -519,6 +531,7 @@ describe('tests for "users" module', () => {
     window.toastr = toastr;
     window.trans = trans;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -566,6 +579,7 @@ describe('tests for "users" module', () => {
     window.toastr = toastr;
     window.trans = trans;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     const changeUserPwd = require(modulePath).changeUserPwd;
 
@@ -597,6 +611,7 @@ describe('tests for "users" module', () => {
     window.fetch = fetch;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -648,6 +663,7 @@ describe('tests for "users" module', () => {
     window.url = url;
     window.toastr = toastr;
     window.trans = trans;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -720,6 +736,7 @@ describe('tests for "users" module', () => {
     window.url = url;
     window.toastr = toastr;
     window.trans = trans;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <table>
@@ -784,6 +801,7 @@ describe('tests for "users" module', () => {
     window.toastr = toastr;
     window.trans = trans;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = '<tr id="user-1"></tr>';
     const deleteUserAccount = require(modulePath).deleteUserAccount;
diff --git a/resources/assets/src/js/__tests__/user.test.js b/resources/assets/src/js/__tests__/user.test.js
index 27f1a4b2..9da5fb06 100644
--- a/resources/assets/src/js/__tests__/user.test.js
+++ b/resources/assets/src/js/__tests__/user.test.js
@@ -22,6 +22,7 @@ describe('tests for "closet" module', () => {
     window.trans = trans;
     window.url = url;
     window.MSP = MSP;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div id="textures-indicator"></div>
@@ -71,6 +72,7 @@ describe('tests for "closet" module', () => {
     const url = jest.fn(path => path);
     window.trans = trans;
     window.url = url;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <input name="q" />
@@ -126,6 +128,7 @@ describe('tests for "closet" module', () => {
     window.url = url;
     window.swal = swal;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div id="skin-category">
@@ -174,6 +177,7 @@ describe('tests for "closet" module', () => {
     window.url = url;
     window.swal = swal;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div id="skin-category">
@@ -226,6 +230,7 @@ describe('tests for "closet" module', () => {
     window.url = url;
     window.swal = swal;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div id="skin-category">
@@ -275,6 +280,7 @@ describe('tests for "closet" module', () => {
     window.url = url;
     window.swal = swal;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <img alt="User Image" src="src" />
@@ -316,6 +322,7 @@ describe('tests for "player" module', () => {
       }));
     window.url = url;
     window.fetch = fetch;
+    window.showAjaxError = jest.fn();
     window.TexturePreview = require('../common/texture-preview');
     window.MSP = {
       changeSkin: jest.fn(),
@@ -353,6 +360,7 @@ describe('tests for "player" module', () => {
     window.fetch = fetch;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <select id="preference" pid="1">
@@ -399,6 +407,7 @@ describe('tests for "player" module', () => {
     window.trans = trans;
     window.toastr = toastr;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <input id="player_name" placeholder="placeholder" />
@@ -445,6 +454,7 @@ describe('tests for "player" module', () => {
     window.url = url;
     window.trans = trans;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
     $.fn.modal = modal;
 
     document.body.innerHTML = `
@@ -489,6 +499,7 @@ describe('tests for "player" module', () => {
     window.url = url;
     window.toastr = toastr;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <tr id="1"></tr>
@@ -531,6 +542,7 @@ describe('tests for "player" module', () => {
     window.url = url;
     window.toastr = toastr;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
     $.fn.modal = modal;
 
     document.body.innerHTML = `
@@ -570,6 +582,7 @@ describe('tests for "player" module', () => {
     window.swal = swal;
     $.fn.modal = modal;
     window.selectedTextures = {};
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <input name="player" id="1" />
@@ -614,6 +627,7 @@ describe('tests for "profile" module', () => {
     window.trans = trans;
     window.url = url;
     window.debounce = jest.fn(fn => fn);
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div class="nickname"></div>
@@ -661,6 +675,7 @@ describe('tests for "profile" module', () => {
     window.trans = trans;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
     window.logout = jest.fn().mockReturnValue(Promise.resolve({ errno: 0 }));
 
     document.body.innerHTML = `
@@ -722,6 +737,7 @@ describe('tests for "profile" module', () => {
     window.trans = trans;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
     window.logout = jest.fn().mockReturnValue(Promise.resolve({ errno: 0 }));
 
     document.body.innerHTML = `
@@ -769,6 +785,7 @@ describe('tests for "profile" module', () => {
     window.trans = trans;
     window.url = url;
     window.toastr = toastr;
+    window.showAjaxError = jest.fn();
 
     document.body.innerHTML = `
       <div class="modal-body">
@@ -810,6 +827,7 @@ describe('tests for "sign" module', () => {
     window.toastr = toastr;
     window.trans = trans;
     window.swal = swal;
+    window.showAjaxError = jest.fn();
     window.debounce = fn => fn;
     const fetch = jest.fn()
       .mockReturnValueOnce(Promise.resolve({