Refactored.

test/Volo.Abp.TestApp/Volo/Abp/TestApp/TestAppModule.cs

@@ -26,11 +26,16 @@ namespace Volo.Abp.TestApp
 
         public override void OnApplicationInitialization(ApplicationInitializationContext context)
         {
-            //TODO: Refactor to a seed class!
-            using(IServiceScope scope = context.ServiceProvider.CreateScope())
+            SeedTestData(context);
+        }
+
+        private static void SeedTestData(ApplicationInitializationContext context)
+        {
+            using (IServiceScope scope = context.ServiceProvider.CreateScope())
             {
-                var personRepository = scope.ServiceProvider.GetRequiredService<IRepository<Person>>();
-                personRepository.Insert(new Person(Guid.NewGuid(), "Douglas", 42));
+                scope.ServiceProvider
+                    .GetRequiredService<TestDataBuilder>()
+                    .Build();
             }
         }
     }

test/Volo.Abp.TestApp/Volo/Abp/TestApp/TestDataBuilder.cs

@@ -0,0 +1,22 @@
+using System;
+using Volo.Abp.DependencyInjection;
+using Volo.Abp.Domain.Repositories;
+using Volo.Abp.TestApp.Domain;
+
+namespace Volo.Abp.TestApp
+{
+    public class TestDataBuilder : ITransientDependency
+    {
+        private readonly IRepository<Person> _personRepository;
+
+        public TestDataBuilder(IRepository<Person> personRepository)
+        {
+            _personRepository = personRepository;
+        }
+
+        public void Build()
+        {
+            _personRepository.Insert(new Person(Guid.NewGuid(), "Douglas", 42));
+        }
+    }
+}