test exception code complet

Sources/UnitTesting/CodeCompletExceptionUT.cs

@@ -1,4 +1,7 @@
 using CoreLibrary.Exceptions;
+using System.Runtime.Serialization;
+using System.Runtime.Serialization.Formatters.Binary;
+using System.Text.Json;
 using Xunit;
 
 namespace UnitTesting
@@ -50,5 +53,17 @@ namespace UnitTesting
             }
         }
 
+        [Fact]
+        public void ExceptionSerialisation()
+        {
+            CodeCompletException exception = new CodeCompletException();
+
+            string jsonString = JsonSerializer.Serialize(exception);
+            CodeCompletException? exceptionSerialisee = 
+                JsonSerializer.Deserialize<CodeCompletException>(jsonString);
+
+            Assert.NotNull(exceptionSerialisee);
+            Assert.Equal(exception.Message, exceptionSerialisee.Message);
+        }
     }
 }