MQTTnet/Tests/MQTTnet.Core.Tests/MqttPacketWriter_Tests.cs

using Microsoft.VisualStudio.TestTools.UnitTesting;
using MQTTnet.Formatter;

namespace MQTTnet.Tests
{
    [TestClass]
    public class MqttPacketWriter_Tests
    {
        protected virtual IMqttPacketWriter WriterFactory()
        {
            return new MqttPacketWriter();
        }

        [TestMethod]
        public void WritePacket()
        {
            var writer = WriterFactory();
            Assert.AreEqual(0, writer.Length);

            writer.WriteWithLengthPrefix("1234567890");
            Assert.AreEqual(10 + 2, writer.Length);

            writer.WriteWithLengthPrefix(new byte[300]);
            Assert.AreEqual(300 + 2 + 12, writer.Length);

            writer.WriteWithLengthPrefix(new byte[5000]);
            Assert.AreEqual(5000 + 2 + 300 + 2 + 12, writer.Length);
        }
    }
}