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

https://angular.io/guide/testing currently shows a few ways. Here is one:

it('#getObservableValue should return value from observable',
    (done: DoneFn) => {
       service.getObservableValue().subscribe(value => {
       expect(value).toBe('observable value');
       done();
    });
});