/// <summary>
/// Rule 3) Objects must be initialized to a valid state. Not doing so is a compile-time error.
/// </summary>
public void TestObjectsMustBeInitializedToAValidState()
{
// create a customer
var cust = new Customer();
// what is the expected output?
Console.WriteLine(cust.Address.Country);
}
/// <summary>
/// Rule 4) Once created, objects and collections must be immutable (by default)
/// </summary>
public void TestImmutability2()
{
// create a customer
var cust = new Customer(99, "J Smith");
// add it to a set
var processedCustomers = new HashSet<Customer>();
processedCustomers.Add(cust);
// process it and return the changes
var changedCustomer = this.ProcessCustomer(cust);
// true or false?
processedCustomers.Contains(cust);
}
/// <summary>
/// Rule 2) Comparing objects of different types is a compile-time error.
/// </summary>
public void TestEqualityBetweenCustomerAndOrder()
{
var cust = new Customer(99, "J Smith");
var order = new Customer(99, "J Smith");
var areEqual = cust.Equals(order);
}
/// <summary>
/// Rule 1) Objects with the same values should be equal by default.
/// </summary>
public void TestEqualityBetweenCustomers()
{
var cust1 = new Customer(99, "J Smith");
var cust2 = new Customer(99, "J Smith");
var areEqual = (cust1 == cust2);
}
private Customer ProcessCustomer(Customer cust)
{
return new Customer(cust.Id, "new name");
}