diff --git a/STX.SPAL.Core.Tests.Unit/STX.SPAL.Core.Tests.Unit.csproj b/STX.SPAL.Core.Tests.Unit/STX.SPAL.Core.Tests.Unit.csproj
index 9823055..a3b042c 100644
--- a/STX.SPAL.Core.Tests.Unit/STX.SPAL.Core.Tests.Unit.csproj
+++ b/STX.SPAL.Core.Tests.Unit/STX.SPAL.Core.Tests.Unit.csproj
@@ -10,6 +10,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="CleanMoq" Version="1.0.0" />
+		<PackageReference Include="CompareNETObjects" Version="4.83.0" />
 		<PackageReference Include="FluentAssertions" Version="6.12.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
 		<PackageReference Include="Tynamix.ObjectFiller" Version="1.5.8" />
diff --git a/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.Logic.RegisterServiceDescriptor.cs b/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.Logic.RegisterServiceDescriptor.cs
index dce99ef..3b5d1d6 100644
--- a/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.Logic.RegisterServiceDescriptor.cs
+++ b/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.Logic.RegisterServiceDescriptor.cs
@@ -4,6 +4,7 @@
 
 using FluentAssertions;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
 using Moq;
 
 namespace STX.SPAL.Core.Tests.Unit.Services.Foundations.ServicesCollections
@@ -19,16 +20,23 @@ private void ShouldRegisterServiceDescriptor()
 
             ServiceDescriptor randomServiceDescriptor = randomProperties.ServiceDescriptor;
             ServiceDescriptor inputServiceDescriptor = randomServiceDescriptor;
+            ServiceDescriptor expectedServiceDescriptor = inputServiceDescriptor;
 
             IServiceCollection randomServiceCollection = randomProperties.ServiceCollection;
             IServiceCollection expectedServiceCollection = randomServiceCollection;
             IServiceCollection returnedServiceCollection = randomServiceCollection;
 
+            expectedServiceCollection.Add(inputServiceDescriptor);
+
             this.dependencyInjectionBroker
                 .Setup(broker =>
                     broker.RegisterServiceDescriptor(
                         It.Is<ServiceDescriptor>(actualServiceDescriptor =>
-                            actualServiceDescriptor == inputServiceDescriptor)))
+                            SameServiceDescriptorAs(
+                                actualServiceDescriptor,
+                                expectedServiceDescriptor)
+                            .Compile()
+                            .Invoke(actualServiceDescriptor))))
                 .Returns(returnedServiceCollection);
 
             // when
@@ -45,7 +53,11 @@ private void ShouldRegisterServiceDescriptor()
                 broker =>
                     broker.RegisterServiceDescriptor(
                         It.Is<ServiceDescriptor>(actualServiceDescriptor =>
-                            actualServiceDescriptor == inputServiceDescriptor)),
+                            SameServiceDescriptorAs(
+                                actualServiceDescriptor,
+                                expectedServiceDescriptor)
+                            .Compile()
+                            .Invoke(actualServiceDescriptor))),
                     Times.Once);
 
             this.dependencyInjectionBroker.VerifyNoOtherCalls();
diff --git a/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.cs b/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.cs
index 4fa097f..36bb902 100644
--- a/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.cs
+++ b/STX.SPAL.Core.Tests.Unit/Services/Foundations/ServicesCollections/ServiceCollectionServiceTests.cs
@@ -3,8 +3,10 @@
 // ----------------------------------------------------------------------------------
 
 using System;
+using System.Linq.Expressions;
 using System.Reflection;
 using System.Reflection.Emit;
+using KellermanSoftware.CompareNetObjects;
 using Microsoft.Extensions.DependencyInjection;
 using Moq;
 using STX.SPAL.Abstractions;
@@ -17,11 +19,13 @@ namespace STX.SPAL.Core.Tests.Unit.Services.Foundations.ServicesCollections
     public partial class ServiceCollectionServiceTests
     {
         private readonly Mock<IDependencyInjectionBroker> dependencyInjectionBroker;
+        private readonly ICompareLogic compareLogic;
         private readonly IServiceCollectionService serviceCollectionService;
 
         public ServiceCollectionServiceTests()
         {
             this.dependencyInjectionBroker = new Mock<IDependencyInjectionBroker>();
+            this.compareLogic = new CompareLogic();
 
             this.serviceCollectionService =
                 new ServiceCollectionService(dependencyInjectionBroker.Object);
@@ -108,6 +112,12 @@ private static dynamic CreateRandomProperties()
                 ServiceLifeTime = randomServiceLifeTime,
 
                 ServiceDescriptor =
+                    new ServiceDescriptor(
+                        randomSpalInterfaceType,
+                        randomImplementationType,
+                        randomServiceLifeTime),
+
+                ServiceDescriptorWithSpalId =
                     new ServiceDescriptor(
                         randomSpalInterfaceType,
                         randomSpalId,
@@ -117,5 +127,16 @@ private static dynamic CreateRandomProperties()
                 ServiceCollection = new ServiceCollection()
             };
         }
+
+        private Expression<Func<ServiceDescriptor, bool>> SameServiceDescriptorAs(
+            ServiceDescriptor actualServiceDescriptor,
+            ServiceDescriptor expectedServiceDescriptor)
+        {
+            return actualServiceDescriptor =>
+                this.compareLogic.Compare(
+                    expectedServiceDescriptor,
+                    actualServiceDescriptor)
+                        .AreEqual;
+        }
     }
 }
diff --git a/STX.SPAL.Core/Models/Services/Foundations/ServicesCollections/ServiceCollectionService.cs b/STX.SPAL.Core/Models/Services/Foundations/ServicesCollections/ServiceCollectionService.cs
index 44898c4..9d1f92b 100644
--- a/STX.SPAL.Core/Models/Services/Foundations/ServicesCollections/ServiceCollectionService.cs
+++ b/STX.SPAL.Core/Models/Services/Foundations/ServicesCollections/ServiceCollectionService.cs
@@ -22,7 +22,11 @@ public IServiceCollection RegisterServiceDescriptor(
             Type implementationType,
             ServiceLifetime serviceLifetime)
         {
-            throw new System.NotImplementedException();
+            ServiceDescriptor serviceDescriptor =
+                new ServiceDescriptor(spalInterfaceType, implementationType, serviceLifetime);
+
+            IServiceCollection serviceCollection = dependencyInjectionBroker.RegisterServiceDescriptor(serviceDescriptor);
+            return serviceCollection;
         }
     }
 }