From 175c18dd06f54000926fe36a14c5e008559e2837 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Halil=20=C4=B0brahim=20Kalkan?= <hi_kalkan@yahoo.com>
Date: Sat, 17 Oct 2020 18:06:29 +0300
Subject: [PATCH] Update Part-4.md

---
 docs/en/Tutorials/Part-4.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docs/en/Tutorials/Part-4.md b/docs/en/Tutorials/Part-4.md
index 9c31f4fd3c..d9c000be5c 100644
--- a/docs/en/Tutorials/Part-4.md
+++ b/docs/en/Tutorials/Part-4.md
@@ -75,9 +75,12 @@ If you had created a data seed contributor as described in the [first part](Part
 Add a new test class, named `BookAppService_Tests` in the `Books` namespace (folder) of the `Acme.BookStore.Application.Tests` project:
 
 ````csharp
+using System;
+using System.Linq;
 using System.Threading.Tasks;
 using Shouldly;
 using Volo.Abp.Application.Dtos;
+using Volo.Abp.Validation;
 using Xunit;
 
 namespace Acme.BookStore.Books