public void TestGetMessageInfosAfterDelete()
        {
            // arrange
            const string welcomeMessage = "+OK";
            const string okUsername = "******";
            const string okPassword = "******";

            const string messageDeleteAccepted = "+OK";

            const string messageUidAccepted = "+OK";
            const string messageUid1 = "1 psycho"; // Message 1 has UID psycho
            const string messageUid2 = "3 lord"; // Message 3 has UID lord
            const string uidListEnded = ".";

            const string messageListAccepted = "+OK 2 messages (320 octets)";
            const string messageSize1 = "1 120";
            const string messageSize2 = "3 200";
            const string messageListEnd = ".";


            const string serverResponses = welcomeMessage + "\r\n" + okUsername + "\r\n" + okPassword + "\r\n"
                + messageDeleteAccepted + "\r\n"
                + messageUidAccepted + "\r\n" + messageUid1 + "\r\n" + messageUid2 + "\r\n" + uidListEnded + "\r\n"
                + messageListAccepted + "\r\n" + messageSize1 + "\r\n" + messageSize2 + "\r\n" + messageListEnd + "\r\n"
                ;

            Stream inputStream = new MemoryStream(Encoding.ASCII.GetBytes(serverResponses));
            Stream outputStream = new MemoryStream();

            // act
            Pop3Client client = new Pop3Client();
            client.Connect(new CombinedStream(inputStream, outputStream));
            client.Authenticate("test", "test");

            client.DeleteMessage(2);
            List<MessageInfo> infos = client.GetMessageInfos();

            // assert
            Assert.AreEqual(2, infos.Count);

            Assert.AreEqual(1, infos[0].Number);
            Assert.AreEqual("psycho", infos[0].Identifier);
            Assert.AreEqual(120, infos[0].Size);

            Assert.AreEqual(3, infos[1].Number);
            Assert.AreEqual("lord", infos[1].Identifier);
            Assert.AreEqual(200, infos[1].Size);
        }