public void TestGetMessageSize()
{
const string welcomeMessage = "+OK";
const string okUsername = "******";
const string okPassword = "******";
const string messageSize = "+OK 9 200"; // Message 9 has size 200 octets
const string serverResponses = welcomeMessage + "\r\n" + okUsername + "\r\n" + okPassword + "\r\n" + messageSize + "\r\n";
Stream inputStream = new MemoryStream(Encoding.ASCII.GetBytes(serverResponses));
Stream outputStream = new MemoryStream();
Pop3Client client = new Pop3Client();
client.Connect(new CombinedStream(inputStream, outputStream));
client.Authenticate("test", "test");
// Message 9 should have size 200
const int expectedOutput = 200;
int output = client.GetMessageSize(9);
Assert.AreEqual(expectedOutput, output);
}