test adding instrumentation and activity tag

Backend.Tests/Controllers/WordControllerTests.cs

@@ -6,10 +6,10 @@
 using BackendFramework.Controllers;
 using BackendFramework.Interfaces;
 using BackendFramework.Models;
-using BackendFramework.Otel;
+// using BackendFramework.Otel;
 using BackendFramework.Services;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.DependencyInjection;
+// using Microsoft.Extensions.DependencyInjection;
 using NUnit.Framework;
 
 namespace Backend.Tests.Controllers
@@ -391,8 +391,8 @@ public async Task TestUpdateDuplicateNonDuplicate()
         [Test]
         public async Task TestCreateWord()
         {
-            var service = new ServiceCollection();
-            service.AddOpenTelemetryInstrumentation();
+            // var service = new ServiceCollection();
+            // service.AddOpenTelemetryInstrumentation();
 
             var word = Util.RandomWord(_projId);
 

Backend.Tests/Otel/OtelServiceTest.cs

@@ -0,0 +1,19 @@
+using BackendFramework.Otel;
+using Microsoft.Extensions.DependencyInjection;
+using NUnit.Framework;
+
+namespace Backend.Tests.Otel
+{
+    public class OtelServiceTests
+    {
+        [Test]
+        public static void TestAddOtelTag()
+        {
+            var services = new ServiceCollection();
+            OtelService.AddOtelInstrumentation(services);
+            OtelService.AddOtelTag("test key", "test val");
+
+        }
+
+    }
+}

Backend/Otel/OtelService.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace BackendFramework.Otel;
 
@@ -12,4 +13,9 @@ public static void AddOtelTag(string key, object? value)
         using var activity = new ActivitySource(OtelKernel.SourceName).StartActivity();
         activity?.AddTag(key, value);
     }
+
+    public static void AddOtelInstrumentation(IServiceCollection services)
+    {
+        services.AddOpenTelemetryInstrumentation();
+    }
 }