testing.spec.ts

// delegate to your own implementation
spyOn(MoviesComponent, 'getMovies').and.callFake(() => {});

//delegate to your own implementation with an argument
spyOn(MoviesComponent, 'getMovies').withArgs('').and.callFake(() => {}); 

//return a specific value 'false'
spyon(MoviesComponent, 'getMovies').and.returnValue({movies: ['terminator', 'titanic', 'avatar']}});

//delegate to the actual implementation
spyOn(MoviesComponent, 'getMovies').and.callThrough();