public void Customer_CustomStructralEquality_DifferSurname()
        {
            Customer c1 = new Customer("Oliver", "Lassen");
            Customer c2 = new Customer("Oliver", "Lassen", "Leo");

            Assert.True(c1.Equals(c2, CustomerEqualityComparer.Default));
        }
        public static void Main(string[] args)
        {
            Customer c1 = new Customer("Oliver", "Lassen");
            Customer c2 = new Customer("Oliver", "Lassen");

            Console.WriteLine("Reference equality: {0} (Should not be equal)", c1 == c2);
            Console.WriteLine("x.Equals(): {0} (Should not be equal)", c1.Equals(c2));
        }