public void Find_No_Available_Appointments()
        {
            RegularAppointmentService service = new RegularAppointmentService(CreateAppointmentStubRepository(), CreateScheduleStubRepository(), new DoctorService(CreateOperationStubRepository(), CreateAppointmentStubRepository(), CreateScheduleStubRepository(), CreateDoctorStubRepository()), CreatePatientStubRepository(), new OperationService(CreateOperationStubRepository()));

            List <DoctorAppointment> appointments = service.GetAllAvailableAppointmentsForDate("02/02/2020", 1, 2);

            appointments.ShouldBeEmpty();
        }