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Nitrox.Test/Helper/Faker/NitroxNullableFaker.cs

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+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Nitrox.Test.Helper.Faker;
+
+public class NitroxNullableFaker : NitroxFaker, INitroxFaker
+{
+    private readonly Func<HashSet<Type>, object> generateAction;
+
+    public NitroxNullableFaker(Type type)
+    {
+        OutputType = type.GenericTypeArguments[0];
+        generateAction = (typeTree) =>
+        {
+            MethodInfo castMethod = CastMethodBase.MakeGenericMethod(OutputType);
+            object castedObject = castMethod.Invoke(null, new[] { GetOrCreateFaker(OutputType).GenerateUnsafe(typeTree) });
+
+            Type nullableType = typeof(Nullable<>).MakeGenericType(OutputType);
+            return Activator.CreateInstance(nullableType, castedObject);
+        };
+    }
+
+    public INitroxFaker[] GetSubFakers() => new[] { GetOrCreateFaker(OutputType) };
+
+    public object GenerateUnsafe(HashSet<Type> typeTree) => generateAction.Invoke(typeTree);
+}