test(alert): adds usage of button.cssClass

references #10887

src/components/alert/alert-component.ts

@@ -72,6 +72,7 @@ import { AlertInputOptions, AlertOptions, AlertButton } from './alert-options';
   encapsulation: ViewEncapsulation.None,
 })
 export class AlertCmp {
+
   activeId: string;
   descId: string;
   d: AlertOptions;

src/components/alert/test/basic/app.module.ts

@@ -33,6 +33,7 @@ export class E2EPage {
     alert.addButton({
       text: 'Cancel',
       role: 'cancel',
+      cssClass: 'secondary',
       handler: () => {
         console.log('Confirm Cancel');
         this.testConfirmResult = 'Cancel';