Verify custom properties affect Batch size (serialized bytes)

Author: SeanFeldman

src/Microsoft.Azure.ServiceBus/Core/Batch.cs

@@ -68,7 +68,7 @@ public bool TryAdd(Message message)
         /// </summary>
         public int Length => datas.Count;
 
-        private long Size => result.SerializedMessageSize;
+        internal long Size => result.SerializedMessageSize;
 
 
         /// <summary>

test/Microsoft.Azure.ServiceBus.UnitTests/Primitives/BatchTests.cs

@@ -57,5 +57,28 @@ public void Should_report_how_many_messages_are_in_batch(int numberOfMessages)
                 Assert.Equal(numberOfMessages, batch.Length);
             }
         }
+
+        [Fact]
+        public void Should_show_reflect_property_in_batch_size()
+        {
+            using (var batch = new Batch(100))
+            {
+                var message = new Message();
+
+                batch.TryAdd(message);
+
+                Assert.Equal(24, batch.Size);
+            }
+
+            using (var batch = new Batch(100))
+            {
+                var message = new Message();
+                message.UserProperties["custom"] = "value";
+
+                batch.TryAdd(message);
+
+                Assert.Equal(45, batch.Size);
+            }
+        }
     }
 }