def test_rentBikeOnHourlyBasis_for_valid_positive_number_of_bikes(self):
shop = BikeRental(10)
hour = datetime.now().hour
self.assertEqual(shop.rentBikeOnHourlyBasis(2).hour, hour)
def test_rentBikeOnHourlyBasis_for_zero_number_of_bikes(self):
shop = BikeRental(10)
self.assertEqual(shop.rentBikeOnHourlyBasis(0), None)