Fix test.

Author: MKirova

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

@@ -271,8 +271,9 @@ describe('Basic IgxPivotGrid #pivotGrid', () => {
         });
 
         it('should allow changing default aggregation via value chip drop-down.', () => {
-            fixture.detectChanges();
             const pivotGrid = fixture.componentInstance.pivotGrid;
+            pivotGrid.width = '1500px';
+            fixture.detectChanges();
             const headerRow = fixture.nativeElement.querySelector('igx-pivot-header-row');
             const valueChip = headerRow.querySelector('igx-chip[id="UnitsSold"]');
             let content = valueChip.querySelector('.igx-chip__content');