chore(*): Add test for date column.

Author: MKirova

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

@@ -138,6 +138,28 @@ describe('IgxGrid - Cell merging #grid', () => {
                     { value: 'Ignite UI for JavaScript', span: 9 }
                 ]);
             });
+
+            it('should merge date column correctly.', () => {
+                const col = grid.getColumnByName('ReleaseDate');
+
+                grid.sort({ fieldName: 'ReleaseDate', dir: SortingDirection.Desc, ignoreCase: false });
+                fix.detectChanges();
+
+                // merge date column
+                col.merge = true;
+                fix.detectChanges();
+
+                const today: Date = new Date(new Date().getFullYear(), new Date().getMonth(), new Date().getDate(), 0, 0, 0);
+                const nextDay = new Date(new Date().getFullYear(), new Date().getMonth(), new Date().getDate() + 1, 0, 0, 0);
+                const prevDay = new Date(new Date().getFullYear(), new Date().getMonth(), new Date().getDate() - 1, 0, 0, 0);
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: nextDay, span: 2 },
+                    { value: today, span: 2 },
+                    { value: prevDay, span: 3 },
+                    { value: null, span: 2 }
+                ]);
+            });
         });
 
         describe('UI', () => {

projects/igniteui-angular/src/lib/test-utils/grid-functions.spec.ts

@@ -112,8 +112,8 @@ export class GridFunctions {
             const cellValue = row.cells.toArray().find(x => x.column === col).value;
             const rowSpan = row.metaData?.cellMergeMeta.get(col.field)?.rowSpan || 1;
             const currState = state[index - totalSpan];
-            expect(cellValue).toBe(currState.value);
-            expect(rowSpan).toBe(currState.span);
+            expect(cellValue).toEqual(currState.value);
+            expect(rowSpan).toEqual(currState.span);
             totalSpan += (rowSpan - 1);
             index += (rowSpan - 1);
         }