chore: add missing unit test coverage

Author: ghiscoding

src/app/modules/angular-slickgrid/components/__tests__/angular-slickgrid.component.spec.ts

@@ -57,7 +57,6 @@ import { GridOption } from '../../models';
 import { MockSlickEvent, MockSlickEventHandler } from '../../../../../../test/mockSlickEvent';
 import { RxJsResourceStub } from '../../../../../../test/rxjsResourceStub';
 
-// const slickEventHandler = new MockSlickEventHandler();
 jest.mock('flatpickr', () => { });
 
 const mockSlickRowDetailView = {
@@ -388,6 +387,40 @@ describe('Angular-Slickgrid Custom Component instantiated via Constructor', () =
     expect(component.elementRef.nativeElement).toBeTruthy();
   });
 
+  it('should provide the gridService lazily', () => {
+    const instance = new AngularSlickgridComponent(
+      angularUtilServiceStub,
+      mockAppRef,
+      mockChangeDetectorRef,
+      containerService,
+      mockElementRef,
+      translate as unknown as TranslateService,
+      translaterService as unknown as TranslaterService,
+      {} as GridOption,
+      {
+        backendUtilityService: backendUtilityServiceStub,
+        collectionService: collectionServiceStub,
+        extensionService: undefined,
+        extensionUtility: mockExtensionUtility,
+        eventPubSubService,
+        filterService: filterServiceStub,
+        gridEventService: gridEventServiceStub,
+        gridService: gridServiceStub,
+        gridStateService: gridStateServiceStub,
+        groupingAndColspanService: groupingAndColspanServiceStub,
+        resizerService: resizerServiceStub,
+        paginationService: paginationServiceStub,
+        sharedService,
+        sortService: sortServiceStub,
+        treeDataService: treeDataServiceStub,
+      }
+    );
+
+    expect(instance).toBeTruthy();
+    expect(instance.elementRef.nativeElement).toBeTruthy();
+    expect((instance.extensionService as any).lazyGridService()).toBeDefined();
+  });
+
   it('should load enable mousewheel event scrolling when using a frozen grid', () => {
     component.gridOptions = gridOptions;
     component.gridOptions.enableMouseWheelScrollHandler = undefined;