fix testing setup

Author: marcelnoehre

src/app/components/banner/banner.component.spec.ts

@@ -1,14 +1,15 @@
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 
 import { BannerComponent } from './banner.component';
+import { HttpClientTestingModule } from '@angular/common/http/testing';
 
 describe('BannerComponent', () => {
   let component: BannerComponent;
   let fixture: ComponentFixture<BannerComponent>;
 
   beforeEach(async () => {
     await TestBed.configureTestingModule({
-      imports: [BannerComponent]
+      imports: [BannerComponent, HttpClientTestingModule]
     })
     .compileComponents();
 

src/app/components/grid/grid.component.ts

@@ -20,7 +20,6 @@ export class GridComponent implements OnInit {
   }
 
   redirectTo(url: string): void {
-    // new tab
     window.open(url, '_blank');
   }
 }