diff --git a/broker/src/test/java/io/moquette/spi/impl/MemoryStorageService.java b/broker/src/test/java/io/moquette/spi/impl/MemoryStorageService.java
index 639fe109..78fcedf0 100644
--- a/broker/src/test/java/io/moquette/spi/impl/MemoryStorageService.java
+++ b/broker/src/test/java/io/moquette/spi/impl/MemoryStorageService.java
@@ -13,21 +13,21 @@
  *
  * You may elect to redistribute this code under either of these licenses.
  */
+
 package io.moquette.spi.impl;
 
 import io.moquette.spi.IMessagesStore;
 import io.moquette.spi.ISessionsStore;
 import io.moquette.spi.MessageGUID;
 import io.moquette.spi.persistence.MemorySessionStore;
-
 import java.util.HashMap;
 import java.util.Map;
 
 public class MemoryStorageService {
-    
+
     private MemorySessionStore m_sessionsStore;
     private MemoryMessagesStore m_messagesStore;
-    
+
     public void initStore() {
         Map<String, Map<Integer, MessageGUID>> messageToGuids = new HashMap<>();
         m_messagesStore = new MemoryMessagesStore(messageToGuids);