Add FieldClearMap to service collection and create verification test

Co-authored-by: MrHinsh <[email protected]>

Author: Copilot

src/MigrationTools.Clients.TfsObjectModel.Tests/Tools/FieldClearMapServiceRegistrationTests.cs

@@ -0,0 +1,22 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MigrationTools.FieldMaps.AzureDevops.ObjectModel;
+using MigrationTools.Tests;
+
+namespace MigrationTools.Clients.TfsObjectModel.Tests.Tools
+{
+    [TestClass]
+    public class FieldClearMapServiceRegistrationTests
+    {
+        [TestMethod, TestCategory("L0")]
+        public void FieldClearMap_ServiceRegistration_ShouldResolveFromDI()
+        {
+            // Arrange
+            var services = ServiceProviderHelper.GetServices();
+
+            // Act & Assert - This will throw if FieldClearMap is not registered
+            var fieldClearMap = services.GetService<FieldClearMap>();
+            Assert.IsNotNull(fieldClearMap, "FieldClearMap should be registered in the DI container and resolvable");
+        }
+    }
+}

src/MigrationTools.Clients.TfsObjectModel/ServiceCollectionExtensions.cs

@@ -82,6 +82,7 @@ public static void AddMigrationToolServicesForClientLegacyAzureDevOpsObjectModel
             context.AddTransient<RegexFieldMap>();
             context.AddTransient<TreeToTagFieldMap>();
             context.AddTransient<FieldCalculationMap>();
+            context.AddTransient<FieldClearMap>();
 
             // Core
             context.AddTransient<IMigrationClient, TfsTeamProjectEndpoint>();

src/MigrationTools.Tests/Tools/FieldMaps/FieldClearMapTests.cs

@@ -0,0 +1,23 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MigrationTools.Tools;
+
+namespace MigrationTools.Tests.Tools.FieldMaps
+{
+    [TestClass]
+    public class FieldClearMapTests
+    {
+        [TestMethod]
+        public void FieldClearMapOptions_SetExampleConfigDefaults_ShouldSetCorrectValues()
+        {
+            // Arrange
+            var options = new FieldClearMapOptions();
+
+            // Act
+            options.SetExampleConfigDefaults();
+
+            // Assert
+            Assert.AreEqual("System.Description", options.targetField);
+            CollectionAssert.Contains(options.ApplyTo, "*");
+        }
+    }
+}