chore(*): add test covering the scenario

Author: onlyexeption

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

@@ -4412,6 +4412,15 @@ describe('IgxGrid - Filtering actions - Excel style filtering #grid', () => {
             checkboxes = Array.from(GridFunctions.getExcelStyleFilteringCheckboxes(fix));
             expect(checkboxes.every(ch => ch.checked)).toBeTrue();
         }));
+
+        it('Should have input type number when column dataType is number.', fakeAsync(() => {
+            GridFunctions.clickExcelFilterIconFromCode(fix, grid, 'Downloads');
+            flush();
+
+            const inputNativeElement = GridFunctions.getExcelStyleSearchComponentInput(fix);
+            expect(inputNativeElement.type).toBe('number', 'input type of number column is not number');
+
+        }));
     });
 
     describe(null, () => {