Unit testing an observable in Angular 2

Question

What is the correct way of unit testing a service returning an Observable result in Angular 2? Let\'s say we have a getCars method in a CarService service class:

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Answer 1

Finally I end with a working example. Observable class has a method toPromise that converts an Observable to a Promise object. The correct way should be:

it('retrieves all the cars', injectAsync( [CarService], ( carService ) => {
  return carService.getCars().toPromise().then( (result) => {         
     expect(result.length).toBeGreaterThan(0);
  } );       
}) );

But while to above code works with any Observable object, I still have the problem with the Observables returned from Http requests which is probably a bug. Here is a plunker demonstrating the case above: http://plnkr.co/edit/ak2qZH685QzTN6RoK71H?p=preview

Update:
As of version beta.14 it seems to work properly with the provided solution.