diff --git a/src/test/java/mate/academy/bookstore/controller/BookControllerTest.java b/src/test/java/mate/academy/bookstore/controller/BookControllerTest.java
index 82e3c1c..e1acaa2 100644
--- a/src/test/java/mate/academy/bookstore/controller/BookControllerTest.java
+++ b/src/test/java/mate/academy/bookstore/controller/BookControllerTest.java
@@ -1,5 +1,22 @@
 package mate.academy.bookstore.controller;
 
+import static mate.academy.bookstore.util.TestConstants.ADMIN_ROLE;
+import static mate.academy.bookstore.util.TestConstants.AUTHOR_PARAM_NAME;
+import static mate.academy.bookstore.util.TestConstants.BASE_URL;
+import static mate.academy.bookstore.util.TestConstants.ID;
+import static mate.academy.bookstore.util.TestConstants.ISBN_PARAM_NAME;
+import static mate.academy.bookstore.util.TestConstants.PRICE_PARAM_NAME;
+import static mate.academy.bookstore.util.TestConstants.SEARCH_URL;
+import static mate.academy.bookstore.util.TestConstants.SET_OF_VALID_CATEGORY_ID;
+import static mate.academy.bookstore.util.TestConstants.TITLE_0_EXPRESSION;
+import static mate.academy.bookstore.util.TestConstants.TITLE_EXPRESSION;
+import static mate.academy.bookstore.util.TestConstants.TITLE_PARAM_NAME;
+import static mate.academy.bookstore.util.TestConstants.USER_ROLE;
+import static mate.academy.bookstore.util.TestConstants.VALID_BOOK_AUTHOR;
+import static mate.academy.bookstore.util.TestConstants.VALID_BOOK_ID;
+import static mate.academy.bookstore.util.TestConstants.VALID_BOOK_ISBN;
+import static mate.academy.bookstore.util.TestConstants.VALID_BOOK_PRICE;
+import static mate.academy.bookstore.util.TestConstants.VALID_BOOK_TITLE;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyLong;
 import static org.mockito.Mockito.when;
@@ -12,9 +29,7 @@
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
-import java.math.BigDecimal;
 import java.util.Collections;
-import java.util.Set;
 import mate.academy.bookstore.dto.book.BookDto;
 import mate.academy.bookstore.dto.book.BookSearchParametersDto;
 import mate.academy.bookstore.dto.book.CreateBookRequestDto;
@@ -35,24 +50,6 @@
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
 public class BookControllerTest {
-    private static final String ID = "/{id}";
-    private static final String TITLE_PARAM_NAME = "title";
-    private static final String AUTHOR_PARAM_NAME = "author";
-    private static final String ISBN_PARAM_NAME = "isbn";
-    private static final String PRICE_PARAM_NAME = "price";
-    private static final String BASE_URL = "/books";
-    private static final String SEARCH_URL = BASE_URL + "/search";
-    private static final String ADMIN_ROLE = "ADMIN";
-    private static final String USER_ROLE = "USER";
-    private static final String VALID_BOOK_TITLE = "Kobzar";
-    private static final String VALID_BOOK_AUTHOR = "Taras Shevchenko";
-    private static final String VALID_BOOK_ISBN = "978-0-7847-5628-7";
-    private static final BigDecimal VALID_BOOK_PRICE = BigDecimal.valueOf(14.99);
-    private static final Set<Long> VALID_CATEGORY_ID = Set.of(1L);
-    private static final Long VALID_BOOK_ID = 1L;
-    private static final String TITLE_0_EXPRESSION = "$[0].title";
-    private static final String TITLE_EXPRESSION = "$.title";
-
     private static MockMvc mockMvc;
 
     @MockBean
@@ -85,7 +82,7 @@ void setup() {
         createBookDto.setTitle(VALID_BOOK_TITLE);
         createBookDto.setAuthor(VALID_BOOK_AUTHOR);
         createBookDto.setIsbn(VALID_BOOK_ISBN);
-        createBookDto.setCategoryIds(VALID_CATEGORY_ID);
+        createBookDto.setCategoryIds(SET_OF_VALID_CATEGORY_ID);
         createBookDto.setPrice(VALID_BOOK_PRICE);
     }
 
diff --git a/src/test/java/mate/academy/bookstore/controller/CategoryControllerTest.java b/src/test/java/mate/academy/bookstore/controller/CategoryControllerTest.java
index 0fad4e0..43da559 100644
--- a/src/test/java/mate/academy/bookstore/controller/CategoryControllerTest.java
+++ b/src/test/java/mate/academy/bookstore/controller/CategoryControllerTest.java
@@ -1,5 +1,14 @@
 package mate.academy.bookstore.controller;
 
+import static mate.academy.bookstore.util.TestConstants.ADMIN_ROLE;
+import static mate.academy.bookstore.util.TestConstants.CATEGORIES_ID_BOOKS_URL;
+import static mate.academy.bookstore.util.TestConstants.CATEGORIES_ID_URL;
+import static mate.academy.bookstore.util.TestConstants.CATEGORIES_URL;
+import static mate.academy.bookstore.util.TestConstants.EXPRESSION;
+import static mate.academy.bookstore.util.TestConstants.NAME_EXPRESSION;
+import static mate.academy.bookstore.util.TestConstants.USER_ROLE;
+import static mate.academy.bookstore.util.TestConstants.VALID_CATEGORY_ID;
+import static mate.academy.bookstore.util.TestConstants.VALID_CATEGORY_NAME;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.when;
@@ -32,15 +41,6 @@
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
 class CategoryControllerTest {
-    private static final Long VALID_CATEGORY_ID = 1L;
-    private static final String VALID_CATEGORY_NAME = "Fiction";
-    private static final String CATEGORIES_URL = "/categories";
-    private static final String CATEGORIES_ID_URL = "/categories/{id}";
-    private static final String CATEGORIES_ID_BOOKS_URL = "/categories/{id}/books";
-    private static final String EXPRESSION = "$";
-    private static final String NAME_EXPRESSION = "$.name";
-    private static final String ADMIN_ROLE = "ADMIN";
-    private static final String USER_ROLE = "USER";
     private static MockMvc mockMvc;
 
     @Mock
diff --git a/src/test/java/mate/academy/bookstore/util/TestConstants.java b/src/test/java/mate/academy/bookstore/util/TestConstants.java
index fc2e112..52cd628 100644
--- a/src/test/java/mate/academy/bookstore/util/TestConstants.java
+++ b/src/test/java/mate/academy/bookstore/util/TestConstants.java
@@ -38,4 +38,24 @@ public class TestConstants {
     public static final String VALID_BOOK_ISBN_NOT_IN_DB = "978-1-2345-6789-0";
     public static final Long INVALID_ID = -1L;
     public static final Long EMPTY_CATEGORY_ID = 4L;
+
+    public static final String ID = "/{id}";
+    public static final String TITLE_PARAM_NAME = "title";
+    public static final String AUTHOR_PARAM_NAME = "author";
+    public static final String ISBN_PARAM_NAME = "isbn";
+    public static final String PRICE_PARAM_NAME = "price";
+    public static final String BASE_URL = "/books";
+    public static final String SEARCH_URL = BASE_URL + "/search";
+
+    public static final String ADMIN_ROLE = "ADMIN";
+    public static final String USER_ROLE = "USER";
+
+    public static final String TITLE_0_EXPRESSION = "$[0].title";
+    public static final String TITLE_EXPRESSION = "$.title";
+
+    public static final String CATEGORIES_URL = "/categories";
+    public static final String CATEGORIES_ID_URL = "/categories/{id}";
+    public static final String CATEGORIES_ID_BOOKS_URL = "/categories/{id}/books";
+    public static final String EXPRESSION = "$";
+    public static final String NAME_EXPRESSION = "$.name";
 }