public void SayWillWriteCorrectMessageToMessageWriter()
{
// Arrange
var writer = new TestSpyMessageWriter();
var systemUnderTest = new Salutation(writer);
// Act
var message = "Test DI!";
systemUnderTest.Say(message);
// Assert
writer.MessageWritten.Should().Be(message);
}
static void Main(string[] args)
{
// 原本只要這樣一行
System.Console.WriteLine("Hello World!");
// 用 DI 的方法
IMessageWriter writer = new ConsoleMessageWriter();
var salutation = new Salutation(writer);
salutation.Say("Hello DI!");
// 用裝飾者模式寫個新的 IMessageWriter 實作看看
IMessageWriter secureWriter = new SecureMessageWriter(writer, "A");
var salutation1 = new Salutation(secureWriter);
salutation1.Say("Hello DI!!!!!");
}