favorite-movies.component.spec.ts

  describe('SearchComponent', () => {
    beforeEach(() => {
      fixture.detectChanges();
    });

    it('should show the search component', () => {
      const searchComponents = fixture.debugElement.queryAll(By.directive(SearchMovieComponent));

      expect(searchComponents.length).toEqual(1);
    });

    it('should add a movie when the user wants to', () => {
      jest.spyOn(favoriteMovieService, 'addMovie');
      const movieToAdd: Movie = { title: 'Joker' } as Movie;
      const searchComponent = fixture.debugElement.query(By.directive(SearchMovieComponent))
        .componentInstance as SearchMovieComponent;

      searchComponent.addMovie.emit(movieToAdd);

      expect(favoriteMovieService.addMovie).toHaveBeenCalledWith(movieToAdd);
    });
  });