feat(igxGrid): Row Pinning + Sorting. Adding test.

Author: MKirova

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

@@ -8,6 +8,7 @@ import { configureTestSuite } from '../../test-utils/configure-suite';
 import { ColumnPinningPosition, RowPinningPosition } from '../common/enums';
 import { IPinningConfig } from '../common/grid.interface';
 import { SampleTestData } from '../../test-utils/sample-test-data.spec';
+import { SortingDirection } from '../../data-operations/sorting-expression.interface';
 
 describe('Row Pinning #grid', () => {
     const FIXED_ROW_CONTAINER = '.igx-grid__tr--pinned ';
@@ -216,6 +217,26 @@ describe('Row Pinning #grid', () => {
               expect(grid.getRowByIndex(0).rowID).toBe(fix.componentInstance.data[0]);
               expect(grid.getRowByIndex(1).rowID).toBe(fix.componentInstance.data[1]);
         });
+
+        it('should apply sorting to both pinned and unpinned rows.', () => {
+            grid.getRowByIndex(1).pin();
+            grid.getRowByIndex(5).pin();
+            fix.detectChanges();
+
+            expect(grid.getRowByIndex(0).rowID).toBe(fix.componentInstance.data[1]);
+            expect(grid.getRowByIndex(1).rowID).toBe(fix.componentInstance.data[5]);
+
+            grid.sort({ fieldName: 'ID', dir: SortingDirection.Desc, ignoreCase: false });
+            fix.detectChanges();
+
+            // check pinned rows data is sorted
+            expect(grid.getRowByIndex(0).rowID).toBe(fix.componentInstance.data[5]);
+            expect(grid.getRowByIndex(1).rowID).toBe(fix.componentInstance.data[1]);
+
+            // check unpinned rows data is sorted
+            const lastIndex = fix.componentInstance.data.length - 1; 
+            expect(grid.getRowByIndex(2).rowID).toBe(fix.componentInstance.data[lastIndex]);
+        });
     });
 });