test(filtering): Fix filter date test flickering due to relying on todays date.

Author: Svetoslav Krastev

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

@@ -2101,6 +2101,7 @@ describe('IgxGrid - Filtering Row UI actions #grid', () => {
 
             const filterUIRow = fix.debugElement.query(By.directive(IgxGridFilteringRowComponent));
             const datePicker = filterUIRow.query(By.directive(IgxDatePickerComponent));
+            const expectedResults = GridFunctions.createDateFilterConditions(grid, today);
 
             // Equals condition
             datePicker.triggerEventHandler('click', null);
@@ -2122,7 +2123,7 @@ describe('IgxGrid - Filtering Row UI actions #grid', () => {
             fix.detectChanges();
 
             expect(grid.filteringRow.expression.condition.name).toEqual('thisMonth');
-            expect(grid.rowList.length).toEqual(3);
+            expect(grid.rowList.length).toEqual(expectedResults[5]);
 
             const conditionChips = filterUIRow.queryAll(By.directive(IgxChipComponent));
             expect(conditionChips.length).toBe(1);