fix(*): fixing more tests

Author: ChronosSF

projects/igniteui-angular/src/lib/combo/combo.component.spec.ts

@@ -1055,7 +1055,7 @@ describe('igxCombo', () => {
                 expect(input.nativeElement.getAttribute('aria-controls')).toEqual(combo.dropdown.listId);
                 expect(input.nativeElement.getAttribute('aria-labelledby')).toEqual(combo.placeholder);
 
-                const dropdown = fixture.debugElement.query(By.css(`.${CSS_CLASS_COMBO_DROPDOWN}`));
+                const dropdown = fixture.debugElement.query(By.css(`div[role="listbox"]`));
                 expect(dropdown.nativeElement.getAttribute('aria-labelledby')).toEqual(combo.placeholder);
 
                 combo.open();

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.spec.ts

@@ -979,7 +979,7 @@ describe('IgxPivotGrid #pivotGrid', () => {
 
                 const chips = excelMenu.querySelectorAll('igx-chip');
                 expect(chips[0].id).toBe('SellerName');
-                expect(chips[0].attributes.getNamedItem('aria-selected').nodeValue).toEqual('aria-selected');
+                expect(chips[0].attributes.getNamedItem('aria-selected').nodeValue).toEqual('true');
                 expect(chips[1].id).toBe('ProductCategory');
                 expect(chips[1].attributes.getNamedItem('aria-selected')).toEqual(null);