public void AddCustomerFromTheListOfAllCustomersTest()
        {
            Customer customer1 = new Customer("Paul", "*****@*****.**", 0, true);
            Customer customer2 = new Customer("Marry", "*****@*****.**", 1, true);

            theater.AddCustomerToTheListOfAllCustomers(customer1);
            theater.AddCustomerToTheListOfAllCustomers(customer2);

            List <Customer> customers = theater.GetListOfAllCustomers();

            Assert.AreEqual(customers[0], customer1);
        }