chore(*): Update tests to consider borders.

Author: MKirova

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

@@ -861,9 +861,9 @@ describe('IgxGrid - Deferred Column Resizing #grid', () => {
             expect(filteringCells[1].nativeElement.getBoundingClientRect().width).toBe(50);
             expect(filteringCells[2].nativeElement.getBoundingClientRect().width).toBe(49);
 
-            expect(headerGroups[0].nativeElement.getBoundingClientRect().width).toBe(48);
+            expect(headerGroups[0].nativeElement.getBoundingClientRect().width).toBe(49);
             expect(headerGroups[1].nativeElement.getBoundingClientRect().width).toBe(50);
-            expect(headerGroups[2].nativeElement.getBoundingClientRect().width).toBe(48);
+            expect(headerGroups[2].nativeElement.getBoundingClientRect().width).toBe(49);
         });
 
         it('should size headers correctly when column width is in %.', () => {

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

@@ -1888,9 +1888,12 @@ describe('IgxGrid Component Tests #grid', () => {
             expect(hScroll.nativeElement.hidden).toBe(true);
 
             for (let i = 0; i < grid.columnList.length; i++) {
-                const header = fix.debugElement.queryAll(By.css('igx-grid-header-group'))[i];
+                const header = fix.debugElement.queryAll(By.css('igx-grid-header'))[i];
                 const cell = fix.debugElement.queryAll(By.css('igx-grid-cell'))[i];
-                expect(header.nativeElement.offsetWidth).toEqual(cell.nativeElement.offsetWidth);
+                const headerStyle = document.defaultView.getComputedStyle(header.nativeElement);
+                const paddingsAndBorders = parseFloat(headerStyle.paddingLeft) + parseFloat(headerStyle.paddingRight) +
+            parseFloat(headerStyle.borderRightWidth);
+                expect(header.nativeElement.offsetWidth).toEqual(Math.max(cell.nativeElement.offsetWidth, paddingsAndBorders));
                 expect(Number.isInteger(header.nativeElement.offsetWidth)).toBe(true);
             }
         });