chore(*): finalizing test fixes

Author: ChronosSF

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

@@ -950,14 +950,14 @@ describe('IgxTreeGrid - Selection #tGrid', () => {
             const context = { index: 0, rowID: 1, selected: false };
             const contextUnselect = { index: 0, rowID: 1, selected: true };
             spyOn(fix.componentInstance, 'onRowCheckboxClick').and.callThrough();
-            firstCheckbox.click();
+            (firstCheckbox as HTMLElement).click();
             fix.detectChanges();
 
             expect(fix.componentInstance.onRowCheckboxClick).toHaveBeenCalledTimes(1);
             expect(fix.componentInstance.onRowCheckboxClick).toHaveBeenCalledWith(new MouseEvent('click'), context);
 
             // Verify correct properties when unselecting a row
-            firstCheckbox.click();
+            (firstCheckbox as HTMLElement).click();
             fix.detectChanges();
 
             expect(fix.componentInstance.onRowCheckboxClick).toHaveBeenCalledTimes(2);

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

@@ -7,7 +7,7 @@ import { IgxInputDirective } from '../input-group';
 import { IgxGridHeaderComponent } from '../grids/headers/grid-header.component';
 import { IgxChipComponent } from '../chips';
 import { IgxGridComponent } from '../grids/grid/grid.component';
-import { IgxColumnGroupComponent } from '../grids/column.component';
+import { IgxColumnGroupComponent } from '../grids/columns/column-group.component';
 import { IgxGridHeaderGroupComponent } from '../grids/headers/grid-header-group.component';
 import { SortingDirection } from '../data-operations/sorting-expression.interface';
 import { IgxCheckboxComponent } from '../checkbox/checkbox.component';

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

@@ -1,5 +1,6 @@
 import { By } from '@angular/platform-browser';
-import { IgxTreeGridComponent, IgxRowComponent, IgxGridBaseComponent, IgxGridCellComponent, IGridDataBindable } from '../grids/tree-grid';
+import { IgxTreeGridComponent, IgxRowComponent, IgxGridBaseComponent, IgxGridCellComponent } from '../grids/tree-grid';
+import { IGridDataBindable } from '../grids/common/grid.interface';
 import { IgxCheckboxComponent } from '../checkbox/checkbox.component';
 import { UIInteractions, wait } from './ui-interactions.spec';