1592 bug of mqttbufferreader (#1593)

Source/MQTTnet.Tests/Protocol_Tests.cs

@@ -8,27 +8,48 @@ using MQTTnet.Formatter;
 namespace MQTTnet.Tests
 {
     [TestClass]
-    public class Protocol_Tests
+    public sealed class Protocol_Tests
     {
         [TestMethod]
         public void Encode_Four_Byte_Integer()
         {
             var writer = new MqttBufferWriter(4, 4);
-            
+
             for (uint value = 0; value < 268435455; value++)
             {
                 writer.WriteVariableByteInteger(value);
-                
+
                 var buffer = writer.GetBuffer();
-                
+
                 var reader = new MqttBufferReader();
                 reader.SetBuffer(buffer, 0, writer.Length);
                 var checkValue = reader.ReadVariableByteInteger();
 
                 Assert.AreEqual(value, checkValue);
-                
+
+                writer.Reset(0);
+            }
+        }
+
+        [TestMethod]
+        public void Encode_Two_Byte_Integer()
+        {
+            var writer = new MqttBufferWriter(2, 2);
+
+            for (ushort value = 0; value < ushort.MaxValue; value++)
+            {
+                writer.WriteTwoByteInteger(value);
+
+                var buffer = writer.GetBuffer();
+
+                var reader = new MqttBufferReader();
+                reader.SetBuffer(buffer, 0, writer.Length);
+                var checkValue = reader.ReadTwoByteInteger();
+
+                Assert.AreEqual(value, checkValue);
+
                 writer.Reset(0);
             }
         }
     }
-}
+}