Test projects are working.

Vector3Visualizer/ExtensionEntrypoint.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.VisualStudio.Extensibility;
+
+namespace Vector3Visualizer
+{
+    /// <summary>
+    /// Extension entrypoint for the VisualStudio.Extensibility extension.
+    /// </summary>
+    [VisualStudioContribution]
+    internal sealed class ExtensionEntrypoint : Extension
+    {
+        /// <inheritdoc/>
+        public override ExtensionConfiguration ExtensionConfiguration => new()
+        {
+            Metadata = new(
+                    id: "Vector3Visualizer.3c0400c3-acec-4b09-b561-c11fac7b10a7",
+                    version: this.ExtensionAssemblyVersion,
+                    publisherName: "Nrx Visualizer",
+                    displayName: "Vector3Visualizer",
+                    description: "Visualizer for MailAdress"),
+        };
+
+        /// <inheritdoc />
+        protected override void InitializeServices(IServiceCollection serviceCollection)
+        {
+            base.InitializeServices(serviceCollection);
+
+            // You can configure dependency injection here by adding services to the serviceCollection.
+        }
+    }
+}