Bael 6131 (#15967)

* chore: Simple test setup

* chore: Authorization error

* feat: Removed using page parameter

* feat: Added MockMvc test

* feat: Added MockUser

* feat: Removed unused import

* feat: WebClientTest documentation

* feat: Working tests for WebMvc and WebTestClient

* feat: Working tests with RestAssured

* feat: Cleanup

* feat: Added a BookService

* feat: Suppressed a warning

* feat: Fixed typo

spring-5/pom.xml

@@ -37,6 +37,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-hateoas</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-webflux</artifactId>
+        </dependency>
         <dependency>
             <groupId>javax.json.bind</groupId>
             <artifactId>javax.json.bind-api</artifactId>
@@ -96,6 +100,12 @@
             <artifactId>spring-restdocs-restassured</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.restdocs</groupId>
+            <artifactId>spring-restdocs-webtestclient</artifactId>
+            <scope>test</scope>
+        </dependency>
+
         <dependency>
             <groupId>com.zaxxer</groupId>
             <artifactId>HikariCP</artifactId>