diff --git a/Directory.Packages.props b/Directory.Packages.props
index cf96f81..375dc3e 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -30,10 +30,12 @@
     <PackageVersion Include="TUnit" Version="1.45.29" />
     <PackageVersion Include="Verify" Version="31.16.3" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
+    <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
     <PackageVersion Include="Verify.TUnit" Version="31.16.3" />
     <PackageVersion Include="WireMock.Net" Version="2.6.0" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="JetBrains.Annotations" />
     <PackageReference Include="Meziantou.Analyzer">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>analyzers</IncludeAssets>
@@ -55,4 +57,4 @@
     <PackageReference Include="Verify.DiffPlex" />
     <PackageReference Include="Verify.TUnit" />
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/tests/Visus.AddressValidation.Integration.FedEx.Tests/ModuleInitializer.cs b/tests/Visus.AddressValidation.Integration.FedEx.Tests/ModuleInitializer.cs
new file mode 100644
index 0000000..3f36c37
--- /dev/null
+++ b/tests/Visus.AddressValidation.Integration.FedEx.Tests/ModuleInitializer.cs
@@ -0,0 +1,15 @@
+namespace Visus.AddressValidation.Integration.FedEx.Tests;
+
+using System.Runtime.CompilerServices;
+using JetBrains.Annotations;
+using VerifyTests.DiffPlex;
+
+[UsedImplicitly]
+internal static class ModuleInitializer
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        VerifyDiffPlex.Initialize(OutputType.Compact);
+    }
+}
diff --git a/tests/Visus.AddressValidation.Integration.Google.Tests/ModuleInitializer.cs b/tests/Visus.AddressValidation.Integration.Google.Tests/ModuleInitializer.cs
new file mode 100644
index 0000000..62834f8
--- /dev/null
+++ b/tests/Visus.AddressValidation.Integration.Google.Tests/ModuleInitializer.cs
@@ -0,0 +1,15 @@
+namespace Visus.AddressValidation.Integration.Google.Tests;
+
+using System.Runtime.CompilerServices;
+using JetBrains.Annotations;
+using VerifyTests.DiffPlex;
+
+[UsedImplicitly]
+internal static class ModuleInitializer
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        VerifyDiffPlex.Initialize(OutputType.Compact);
+    }
+}
diff --git a/tests/Visus.AddressValidation.Integration.PitneyBowes.Tests/ModuleInitializer.cs b/tests/Visus.AddressValidation.Integration.PitneyBowes.Tests/ModuleInitializer.cs
new file mode 100644
index 0000000..5c653a8
--- /dev/null
+++ b/tests/Visus.AddressValidation.Integration.PitneyBowes.Tests/ModuleInitializer.cs
@@ -0,0 +1,15 @@
+namespace Visus.AddressValidation.Integration.PitneyBowes.Tests;
+
+using System.Runtime.CompilerServices;
+using JetBrains.Annotations;
+using VerifyTests.DiffPlex;
+
+[UsedImplicitly]
+internal static class ModuleInitializer
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        VerifyDiffPlex.Initialize(OutputType.Compact);
+    }
+}
diff --git a/tests/Visus.AddressValidation.Integration.Ups.Tests/ModuleInitializer.cs b/tests/Visus.AddressValidation.Integration.Ups.Tests/ModuleInitializer.cs
new file mode 100644
index 0000000..6712fdb
--- /dev/null
+++ b/tests/Visus.AddressValidation.Integration.Ups.Tests/ModuleInitializer.cs
@@ -0,0 +1,15 @@
+namespace Visus.AddressValidation.Integration.Ups.Tests;
+
+using System.Runtime.CompilerServices;
+using JetBrains.Annotations;
+using VerifyTests.DiffPlex;
+
+[UsedImplicitly]
+internal static class ModuleInitializer
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        VerifyDiffPlex.Initialize(OutputType.Compact);
+    }
+}
diff --git a/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.Should_Generate_GetCustomResponseData_For_Nested_Class#Visus_AddressValidation_SourceGeneration_Tests_Response_ApiData_GetCustomResponseData.g.verified.cs b/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.Should_Generate_GetCustomResponseData_For_Nested_Class#Visus_AddressValidation_SourceGeneration_Tests_Response_ApiData_GetCustomResponseData.g.verified.cs
new file mode 100644
index 0000000..ea10667
--- /dev/null
+++ b/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.Should_Generate_GetCustomResponseData_For_Nested_Class#Visus_AddressValidation_SourceGeneration_Tests_Response_ApiData_GetCustomResponseData.g.verified.cs
@@ -0,0 +1,25 @@
+//HintName: Visus_AddressValidation_SourceGeneration_Tests_Response_ApiData_GetCustomResponseData.g.cs
+// <auto-generated/>
+
+#nullable enable annotations
+#nullable disable warnings
+
+using System.Collections.Generic;
+
+namespace Visus.AddressValidation.SourceGeneration.Tests
+{
+    internal partial class Response
+    {
+        private partial class ApiData
+        {
+            public IReadOnlyDictionary<string, object?> GetCustomResponseData()
+            {
+                return new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase)
+                {
+                    ["responseId"] = ResponseId,
+                    ["response"] = ResponseText
+                };
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.Should_Generate_GetCustomResponseData_For_Root_Class#Visus_AddressValidation_SourceGeneration_Tests_ApiResponse_GetCustomResponseData.g.verified.cs b/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.Should_Generate_GetCustomResponseData_For_Root_Class#Visus_AddressValidation_SourceGeneration_Tests_ApiResponse_GetCustomResponseData.g.verified.cs
new file mode 100644
index 0000000..3a5cb5e
--- /dev/null
+++ b/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.Should_Generate_GetCustomResponseData_For_Root_Class#Visus_AddressValidation_SourceGeneration_Tests_ApiResponse_GetCustomResponseData.g.verified.cs
@@ -0,0 +1,22 @@
+//HintName: Visus_AddressValidation_SourceGeneration_Tests_ApiResponse_GetCustomResponseData.g.cs
+// <auto-generated/>
+
+#nullable enable annotations
+#nullable disable warnings
+
+using System.Collections.Generic;
+
+namespace Visus.AddressValidation.SourceGeneration.Tests
+{
+    internal partial class ApiResponse
+    {
+        public IReadOnlyDictionary<string, object?> GetCustomResponseData()
+        {
+            return new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["responseId"] = ResponseId,
+                ["response"] = ResponseText
+            };
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.cs b/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.cs
new file mode 100644
index 0000000..5a2e250
--- /dev/null
+++ b/tests/Visus.AddressValidation.SourceGeneration.Tests/CustomResponseDataGeneratorTests.cs
@@ -0,0 +1,63 @@
+extern alias sourcegen;
+
+namespace Visus.AddressValidation.SourceGeneration.Tests;
+
+using CustomResponseDataGenerator = sourcegen::Visus.AddressValidation.SourceGeneration.CustomResponseDataGenerator;
+
+internal sealed class CustomResponseDataGeneratorTests : SourceGeneratorTestBase
+{
+    protected override IEnumerable<Type> RequiredAssemblies =>
+    [
+        typeof(CustomResponseDataGenerator),
+        typeof(CustomResponseDataPropertyAttribute),
+    ];
+
+    [Test]
+    public Task Should_Generate_GetCustomResponseData_For_Nested_Class()
+    {
+        const string source = """
+                              using Visus.AddressValidation;
+                              
+                              namespace Visus.AddressValidation.SourceGeneration.Tests;
+
+                              partial class Response
+                              {
+                                  public string FirstName { get; set; }
+                                  
+                                  public string LastName { get; set; }
+                                  
+                                  partial class ApiData
+                                  {
+                                      [CustomResponseDataProperty]
+                                      public string ResponseId { get; set; }
+                                      
+                                      [CustomResponseDataProperty("response")]
+                                      public string ResponseText { get; set; }
+                                  }
+                              }
+                              """;
+        
+        return VerifyGenerateSourcesAsync(source, new CustomResponseDataGenerator());
+    }
+
+    [Test]
+    public Task Should_Generate_GetCustomResponseData_For_Root_Class()
+    {
+        const string source = """
+                              using Visus.AddressValidation;
+                              
+                              namespace Visus.AddressValidation.SourceGeneration.Tests;
+
+                              partial class ApiResponse
+                              {
+                                  [CustomResponseDataProperty]
+                                  public string ResponseId { get; set; }
+
+                                  [CustomResponseDataProperty("response")]
+                                  public string ResponseText { get; set; }
+                              }
+                              """;
+        
+        return VerifyGenerateSourcesAsync(source, new CustomResponseDataGenerator());
+    }
+}
diff --git a/tests/Visus.AddressValidation.SourceGeneration.Tests/ModuleInitializer.cs b/tests/Visus.AddressValidation.SourceGeneration.Tests/ModuleInitializer.cs
new file mode 100644
index 0000000..a421616
--- /dev/null
+++ b/tests/Visus.AddressValidation.SourceGeneration.Tests/ModuleInitializer.cs
@@ -0,0 +1,16 @@
+namespace Visus.AddressValidation.SourceGeneration.Tests;
+
+using System.Runtime.CompilerServices;
+using JetBrains.Annotations;
+using VerifyTests.DiffPlex;
+
+[UsedImplicitly]
+internal static class ModuleInitializer
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        VerifySourceGenerators.Initialize();
+        VerifyDiffPlex.Initialize(OutputType.Compact);
+    }
+}
diff --git a/tests/Visus.AddressValidation.SourceGeneration.Tests/SourceGeneratorTestBase.cs b/tests/Visus.AddressValidation.SourceGeneration.Tests/SourceGeneratorTestBase.cs
new file mode 100644
index 0000000..e404c0e
--- /dev/null
+++ b/tests/Visus.AddressValidation.SourceGeneration.Tests/SourceGeneratorTestBase.cs
@@ -0,0 +1,38 @@
+namespace Visus.AddressValidation.SourceGeneration.Tests;
+
+using System.Reflection;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+
+internal abstract class SourceGeneratorTestBase
+{
+    protected abstract IEnumerable<Type> RequiredAssemblies { get; }
+
+    private IEnumerable<MetadataReference> AssemblyReferencesForCodeGen =>
+        AppDomain.CurrentDomain
+                 .GetAssemblies()
+                 .Concat(new[]
+                  {
+                      typeof(Binder),
+                  }.Concat(RequiredAssemblies).Select(s => s.Assembly))
+                 .Distinct()
+                 .Where(w => !w.IsDynamic)
+                 .Select(s => MetadataReference.CreateFromFile(s.Location));
+
+    protected Task VerifyGenerateSourcesAsync(string source, params IIncrementalGenerator[] generators)
+    {
+        SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(source, CSharpParseOptions.Default);
+
+        CSharpCompilation compilation = CSharpCompilation.Create(
+            "compilation",
+            [syntaxTree,],
+            AssemblyReferencesForCodeGen,
+            new CSharpCompilationOptions(OutputKind.ConsoleApplication));
+
+        CSharpGeneratorDriver driver = CSharpGeneratorDriver.Create(generators);
+        GeneratorDriver runner = driver.RunGenerators(compilation);
+        SettingsTask verify = Verify(runner);
+
+        return verify;
+    }
+}
diff --git a/tests/Visus.AddressValidation.SourceGeneration.Tests/Visus.AddressValidation.SourceGeneration.Tests.csproj b/tests/Visus.AddressValidation.SourceGeneration.Tests/Visus.AddressValidation.SourceGeneration.Tests.csproj
index dfc7a44..4599428 100644
--- a/tests/Visus.AddressValidation.SourceGeneration.Tests/Visus.AddressValidation.SourceGeneration.Tests.csproj
+++ b/tests/Visus.AddressValidation.SourceGeneration.Tests/Visus.AddressValidation.SourceGeneration.Tests.csproj
@@ -7,6 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="TUnit"/>
+    <PackageReference Include="Verify.SourceGenerators" />
   </ItemGroup>
 
   <ItemGroup>