NH-3807 - Replace Is.BinarySerializable usage.

Is.BinarySerializable is not available in .netstandard version of NUnit, so perform serialization check manually.

Author: ngbrown

src/NHibernate.Test/DynamicProxyTests/LazyFieldInterceptorTests.cs

@@ -35,7 +35,7 @@ public void LazyFieldInterceptorIsBinarySerializable()
 			var fieldInterceptionProxy = (IFieldInterceptorAccessor)pf.GetFieldInterceptionProxy(new MyClass());
 			fieldInterceptionProxy.FieldInterceptor = new DefaultFieldInterceptor(null, null, null, "MyClass", typeof(MyClass));
 
-			Assert.That(fieldInterceptionProxy, Is.BinarySerializable);
+			NHAssert.IsSerializable(fieldInterceptionProxy);
 		}
 
 

src/NHibernate.Test/NHAssert.cs

@@ -53,7 +53,23 @@ public static void IsSerializable(object obj)
 
 		public static void IsSerializable(object obj, string message, params object[] args)
 		{
-			Assert.That(obj, Is.BinarySerializable, message, args);
+			bool succeeded = false;
+			var serializer = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
+			var stream = new System.IO.MemoryStream();
+			try
+			{
+				serializer.Serialize(stream, obj);
+
+				stream.Seek(0, System.IO.SeekOrigin.Begin);
+
+				succeeded = serializer.Deserialize(stream) != null;
+			}
+			catch (System.Runtime.Serialization.SerializationException)
+			{
+				// Ignore and return failure
+				succeeded = false;
+			}
+			Assert.That(succeeded, message ?? $"Supplied Type {obj.GetType()} is not serializable", args);
 		}
 
 		#endregion
@@ -72,4 +88,4 @@ public static void IsSerializable(object obj, string message, params object[] ar
 			return result;
 		}
 	}
-}
+}