Allow for standalone component tests

When using standalone components the `declarations` property is not used by Angular tests

Instead of
```ts
await TestBed.configureTestingModule({
  imports: [],
  declarations: [ExampleComponent],
  providers: [],
}).compileComponents();
```
it should be

```ts
await TestBed.configureTestingModule({
  imports: [ExampleComponent],
  providers: [],
}).compileComponents();
```