Refined the test case

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/queue/MessagePublisher.java

@@ -3,5 +3,5 @@ package org.baeldung.spring.data.redis.queue;
 
 public interface MessagePublisher {
 
-    void publish(String message);
+    void publish(final String message);
 }

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/queue/RedisMessagePublisher.java

@@ -16,13 +16,13 @@ public class RedisMessagePublisher implements MessagePublisher {
     public RedisMessagePublisher() {
     }
 
-    public RedisMessagePublisher(RedisTemplate<String, Object> redisTemplate,
-                                 ChannelTopic topic) {
+    public RedisMessagePublisher(final RedisTemplate<String, Object> redisTemplate,
+                                 final ChannelTopic topic) {
         this.redisTemplate = redisTemplate;
         this.topic = topic;
     }
 
-    public void publish(String message) {
+    public void publish(final String message) {
         redisTemplate.convertAndSend(topic.getTopic(), message);
     }
 }

spring-data-redis/src/test/java/org/baeldung/spring/data/redis/RedisMessageListenerTest.java

@@ -17,7 +17,6 @@ import static org.junit.Assert.assertTrue;
 @ContextConfiguration(classes = RedisConfig.class)
 public class RedisMessageListenerTest {
 
-
     @Autowired
     private RedisMessagePublisher redisMessagePublisher;