Merge pull request #19298 from yimogit/patch-3

Update Part-4.md

docs/zh-Hans/Tutorials/Part-4.md

@@ -216,7 +216,8 @@ using Xunit;
 namespace Acme.BookStore.Books
 { {{if DB=="Mongo"}}
     [Collection(BookStoreTestConsts.CollectionDefinitionName)]{{end}}
-    public class BookAppService_Tests : BookStoreApplicationTestBase
+    public abstract class BookAppService_Tests<TStartupModule> : BookStoreApplicationTestBase<TStartupModule>
+        where TStartupModule : IAbpModule
     {
         private readonly IBookAppService _bookAppService;