diff --git a/src/main/java/com/example/springbootbookshop/repository/OrderRepository.java b/src/main/java/com/example/springbootbookshop/repository/OrderRepository.java
index 205f6a5..01c8b0b 100644
--- a/src/main/java/com/example/springbootbookshop/repository/OrderRepository.java
+++ b/src/main/java/com/example/springbootbookshop/repository/OrderRepository.java
@@ -1,8 +1,8 @@
 package com.example.springbootbookshop.repository;
 
 import com.example.springbootbookshop.entity.Order;
+import java.util.List;
 import java.util.Optional;
-import java.util.Set;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.EntityGraph;
 import org.springframework.data.jpa.repository.JpaRepository;
@@ -14,5 +14,5 @@ public interface OrderRepository extends JpaRepository<Order, Long> {
     Optional<Order> findOrderByIdAndUserId(Long orderId, Long userId);
 
     @EntityGraph(attributePaths = {"user", "orderItems"})
-    Set<Order> findAllByUserId(Long userId, Pageable pageable);
+    List<Order> findAllByUserId(Long userId, Pageable pageable);
 }
diff --git a/src/test/java/com/example/springbootbookshop/controller/BookControllerTest.java b/src/test/java/com/example/springbootbookshop/controller/BookControllerTest.java
index 2c47f89..957c7b2 100644
--- a/src/test/java/com/example/springbootbookshop/controller/BookControllerTest.java
+++ b/src/test/java/com/example/springbootbookshop/controller/BookControllerTest.java
@@ -170,7 +170,7 @@ void getBookById_ValidId_Ok() throws Exception {
     void deleteBookByIdAssertSuccess() throws Exception {
         mockMvc.perform(delete("/books/2")
                         .contentType(MediaType.APPLICATION_JSON))
-                .andExpect(status().isNotFound());
+                .andExpect(status().isNoContent());
     }
 
     @Test