added tests for randomString and getPusher (#2181)

* added tests for randomString and getPusher

* eslint fixes

* eslint modifications

* index.js line break fix: eslint

* eslint runs successfully

* fix:Utils test - usage of imports

client/app/utils/__tests__/index.test.js

@@ -0,0 +1,20 @@
+import Utils from '../index';
+
+describe('Utils', () => {
+  describe('randomString ', () => {
+    it('should return random string', () => {
+      expect(typeof Utils.randomString()).toBe('string');
+    });
+  });
+
+  describe('getPusher', () => {
+    it('should return null if window.Pusher is not defined', () => {
+      expect(Utils.getPusher()).toBe(null);
+    });
+    it('should return new window.Pusher if window.Pusher is defined', () => {
+      window.Pusher = jest.fn();
+      const pusher = Utils.getPusher();
+      expect(pusher).toBeInstanceOf(window.Pusher);
+    });
+  });
+});

client/app/utils/index.js

@@ -3,12 +3,8 @@ import axios from 'axios';
 import renderHTML from 'react-render-html';
 import { sanitize } from 'dompurify';
 
-const randomString = (): string => Math.random()
-  .toString(36)
-  .substring(2, 15)
-  + Math.random()
-    .toString(36)
-    .substring(2, 15);
+const randomString = (): string => Math.random().toString(36).substring(2, 15)
+  + Math.random().toString(36).substring(2, 15);
 
 const setCsrfToken = (): void => {
   const tokenDom = document.querySelector('meta[name=csrf-token]');