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spec.ts

describe('Quote Service', () => {

  let mockApiService: ApiService;
  let quoteService: QuoteService;
  let mockResponse = [ ... ]; // mock todos response

  beforeEach(() => {
    mockApiService = { get: null } as ApiService;
    spyOn(mockApiService, 'get').and.returnValue(Observable.of({
      json: () => mockResponse
    }));

    quoteService = new QuoteService(mockApiService);
  });

  it('should get to dos', () =>
    QuoteService.getTodos()
      .subscribe(res => {
        expect(mockApiService.get).toHaveBeenCalledWith('/todos');
        expect(res).toEqual(mockResponse);
      });
  );
});