test(tabs): added axe tree test for aria selected state

Author: AdityaPatil22

elements/pf-tabs/test/pf-tabs.spec.ts

@@ -241,6 +241,11 @@ describe('<pf-tabs>', function() {
             expect(second).to.have.attribute('active');
             expect(third).to.not.have.attribute('active');
           });
+
+          it('should specify the selected tab to assistive technology', async function() {
+            const snapshot = await a11ySnapshot();
+            expect(snapshot.children?.find(x => x.role === 'tabpanel')?.name).to.equal('tab-2');
+          });
         });
 
         describe('pressing ArrowLeft', function() {
@@ -254,6 +259,12 @@ describe('<pf-tabs>', function() {
             expect(second).to.not.have.attribute('active');
             expect(third).to.have.attribute('active');
           });
+
+          it('should specify the selected tab to assistive technology', async function() {
+            const snapshot = await a11ySnapshot();
+            expect(snapshot.children?.find(x => x.role === 'tabpanel')?.name).to.equal('tab-3');
+          });
+
           describe('then pressing ArrowRight', function() {
             beforeEach(async function() {
               await sendKeys({ down: 'ArrowRight' });
@@ -267,6 +278,11 @@ describe('<pf-tabs>', function() {
               expect(second).to.not.have.attribute('active');
               expect(third).to.not.have.attribute('active');
             });
+
+            it('should specify the selected tab to assistive technology', async function() {
+              const snapshot = await a11ySnapshot();
+              expect(snapshot.children?.find(x => x.role === 'tabpanel')?.name).to.equal('tab-1');
+            });
           });
         });
       });