public async Task SayHelloAsyncTest()
{
StringBuilder builder = new StringBuilder();
TextWriter writer = new StringWriter(builder);
HelloWorldSpeaker speaker = new HelloWorldSpeaker(writer);
await speaker.SayHelloAsync();
string output = writer.ToString();
Assert.AreEqual(ExpectedHelloWorldMessage, output);
}
static async Task Main(string[] args)
{
IHelloWorldSpeaker speaker = new HelloWorldSpeaker(Console.Out);
await speaker.SayHelloAsync();
}
