Добавьте файлы проекта.

Data/Extentions/ServiceCollectionExtentions.cs

@@ -0,0 +1,13 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using Services.Tickets;
+
+namespace Data.Extentions;
+
+public static class ServiceCollectionExtentions
+{
+    public static void TyAddFakeTicketRepository(this IServiceCollection services)
+    {
+        services.TryAddScoped<ITicketRepository, FakeTicketRepository>();
+    }
+}