Update AccountConnection.test.tsx

Author: aveline

polaris-react/src/components/AccountConnection/tests/AccountConnection.test.tsx

@@ -1,11 +1,20 @@
 import React from 'react';
 import {mountWithApp} from 'tests/utilities';
+import {matchMedia} from '@shopify/jest-dom-mocks';
 
 import {Avatar} from '../../Avatar';
 import {Button} from '../../Button';
 import {AccountConnection} from '../AccountConnection';
 
 describe('<AccountConnection />', () => {
+  beforeEach(() => {
+    matchMedia.mock();
+  });
+
+  afterEach(() => {
+    matchMedia.restore();
+  });
+
   describe('title', () => {
     it('shows the title when one is provided', () => {
       const title = 'Example app';