public void RentABikeToAFamilyOf3()
        {
            var rentalsList = new List <Rental>();

            var bike1   = new Bike();
            var person1 = new Person();
            var rental1 = _repo.RentABikePerHour(bike1, person1, 4);

            rentalsList.Add(rental1);

            var bike2   = new Bike();
            var person2 = new Person();
            var rental2 = _repo.RentABikePerDay(bike2, person2, 1);

            rentalsList.Add(rental2);

            var bike3   = new Bike();
            var person3 = new Person();
            var rental3 = _repo.RentABikePerWeek(bike3, person3, 1);

            rentalsList.Add(rental3);

            var familyRental = _repo.AddToAFamilyRental(rentalsList);

            Assert.AreEqual(3, _repo.GetRentalsCount());
            Assert.AreSame(familyRental, rental1.FamilyRental);
            Assert.AreSame(familyRental, rental2.FamilyRental);
            Assert.AreSame(familyRental, rental3.FamilyRental);
            Assert.AreEqual(70, familyRental.GetTotalChargeWithDiscount());
        }