diff --git a/bulletin-board-client/src/main/java/meerkat/bulletinboard/LocalBulletinBoardClient.java b/bulletin-board-client/src/main/java/meerkat/bulletinboard/LocalBulletinBoardClient.java
index 109d5ed..8e2284c 100644
--- a/bulletin-board-client/src/main/java/meerkat/bulletinboard/LocalBulletinBoardClient.java
+++ b/bulletin-board-client/src/main/java/meerkat/bulletinboard/LocalBulletinBoardClient.java
@@ -500,7 +500,7 @@ public class LocalBulletinBoardClient implements DeletableSubscriptionBulletinBo
             MessagePoster poster = new MessagePoster(msg);
             poster.call();
 
-            digest.update(msg);
+            digest.update(msg.getMsg());
             return digest.digestAsMessageID();
 
     }
diff --git a/bulletin-board-client/src/main/java/meerkat/bulletinboard/SimpleBulletinBoardSynchronizer.java b/bulletin-board-client/src/main/java/meerkat/bulletinboard/SimpleBulletinBoardSynchronizer.java
index f7e9baa..97b6d01 100644
--- a/bulletin-board-client/src/main/java/meerkat/bulletinboard/SimpleBulletinBoardSynchronizer.java
+++ b/bulletin-board-client/src/main/java/meerkat/bulletinboard/SimpleBulletinBoardSynchronizer.java
@@ -26,8 +26,11 @@ public class SimpleBulletinBoardSynchronizer implements BulletinBoardSynchronize
     private List<FutureCallback<SyncStatus>> syncStatusCallbacks;
 
     private static final MessageFilterList EMPTY_FILTER = MessageFilterList.getDefaultInstance();
-    private static final int SLEEP_INTERVAL = 10000; // 10 Seconds
-    private static final int WAIT_CAP = 300000; // 5 minutes wait before deciding that the sync has failed fatally
+    private static final int DEFAULT_SLEEP_INTERVAL = 10000; // 10 Seconds
+    private static final int DEFAULT_WAIT_CAP = 300000; // 5 minutes wait before deciding that the sync has failed fatally
+
+    private final int SLEEP_INTERVAL;
+    private final int WAIT_CAP;
 
     private Semaphore semaphore;
 
@@ -123,6 +126,7 @@ public class SimpleBulletinBoardSynchronizer implements BulletinBoardSynchronize
 
             if (result.size() == 0) {
                 newStatus = SyncStatus.SYNCHRONIZED;
+                semaphore.release();
             }
 
             else{   // Upload messages
@@ -181,8 +185,14 @@ public class SimpleBulletinBoardSynchronizer implements BulletinBoardSynchronize
 
     }
 
-    public SimpleBulletinBoardSynchronizer() {
+    public SimpleBulletinBoardSynchronizer(int sleepInterval, int waitCap) {
         this.syncStatus = SyncStatus.STOPPED;
+        this.SLEEP_INTERVAL = sleepInterval;
+        this.WAIT_CAP = waitCap;
+    }
+
+    public SimpleBulletinBoardSynchronizer() {
+        this(DEFAULT_SLEEP_INTERVAL, DEFAULT_WAIT_CAP);
     }
 
     private synchronized void updateSyncStatus(SyncStatus newStatus) {
@@ -257,11 +267,7 @@ public class SimpleBulletinBoardSynchronizer implements BulletinBoardSynchronize
 
                 do {
 
-                    if (syncStatus == SyncStatus.PENDING || syncStatus == SyncStatus.SERVER_ERROR) {
-
-                        localClient.readMessages(EMPTY_FILTER, callback);
-
-                    }
+                    localClient.readMessages(EMPTY_FILTER, callback);
 
                     try {
 
@@ -272,7 +278,6 @@ public class SimpleBulletinBoardSynchronizer implements BulletinBoardSynchronize
                         // We expect an interruption when the upload will complete
                     }
 
-
                 } while (syncStatus == SyncStatus.PENDING);
 
                 // Database is synced. Wait for new data.
diff --git a/bulletin-board-client/src/test/java/meerkat/bulletinboard/BulletinBoardSynchronizerTest.java b/bulletin-board-client/src/test/java/meerkat/bulletinboard/BulletinBoardSynchronizerTest.java
index a3ace28..1813641 100644
--- a/bulletin-board-client/src/test/java/meerkat/bulletinboard/BulletinBoardSynchronizerTest.java
+++ b/bulletin-board-client/src/test/java/meerkat/bulletinboard/BulletinBoardSynchronizerTest.java
@@ -42,6 +42,9 @@ public class BulletinBoardSynchronizerTest {
     private static final int THREAD_NUM = 3;
     private static final int SUBSCRIPTION_INTERVAL = 1000;
 
+    private static final int SYNC_SLEEP_INTERVAL = 100;
+    private static final int SYNC_WAIT_CAP = 200;
+
     private DeletableSubscriptionBulletinBoardClient localClient;
     private AsyncBulletinBoardClient remoteClient;
 
@@ -70,6 +73,7 @@ public class BulletinBoardSynchronizerTest {
         signerIDs = new ByteString[1];
 
         signers[0] = new GenericBatchDigitalSignature(new ECDSASignature());
+        signerIDs[0] = signers[0].getSignerID();
 
         InputStream keyStream = BulletinBoardSynchronizerTest.class.getResourceAsStream(KEYFILE_EXAMPLE);
         char[] password = KEYFILE_PASSWORD1.toCharArray();
@@ -122,7 +126,7 @@ public class BulletinBoardSynchronizerTest {
                 THREAD_NUM,
                 SUBSCRIPTION_INTERVAL);
 
-        synchronizer = new SimpleBulletinBoardSynchronizer();
+        synchronizer = new SimpleBulletinBoardSynchronizer(SYNC_SLEEP_INTERVAL, SYNC_WAIT_CAP);
         synchronizer.init(localClient, remoteClient);
 
         semaphore = new Semaphore(0);
@@ -200,15 +204,19 @@ public class BulletinBoardSynchronizerTest {
         int[] expectedCounts = {2,0};
         synchronizer.subscribeToRemainingMessagesCount(new MessageCountCallback(expectedCounts));
 
-        Thread t = new Thread(synchronizer);
-        t.run();
+        Thread syncThread = new Thread(synchronizer);
+        syncThread.start();
 
-        semaphore.acquire();
+        semaphore.acquire(2);
 
         synchronizer.stop();
-        t.join();
+        syncThread.join();
 
-        assertThat("Exception thrown by Synchronizer: " + thrown.get(0).getMessage(), thrown.size() == 0);
+        if (thrown.size() > 0) {
+            for (Throwable t : thrown)
+                System.err.println(t.getMessage());
+            assertThat("Exception thrown by Synchronizer: " + thrown.get(0).getMessage(), false);
+        }
 
         List<BulletinBoardMessage> msgList = remoteClient.readMessages(MessageFilterList.newBuilder()
                 .addFilter(MessageFilter.newBuilder()
diff --git a/bulletin-board-client/src/test/java/meerkat/bulletinboard/GenericSubscriptionClientTester.java b/bulletin-board-client/src/test/java/meerkat/bulletinboard/GenericSubscriptionClientTester.java
index 4a5fe62..52da797 100644
--- a/bulletin-board-client/src/test/java/meerkat/bulletinboard/GenericSubscriptionClientTester.java
+++ b/bulletin-board-client/src/test/java/meerkat/bulletinboard/GenericSubscriptionClientTester.java
@@ -16,8 +16,6 @@ import java.security.cert.CertificateException;
 import java.util.*;
 import java.util.concurrent.Semaphore;
 
-import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.assertThat;
 import static org.junit.Assert.fail;
 
 /**
@@ -187,10 +185,8 @@ public class GenericSubscriptionClientTester {
 
     public void subscriptionTest() throws SignatureException, CommunicationException {
 
-        final int FIRST_POST_ID = 201;
-        final int SECOND_POST_ID = 202;
         final String COMMON_TAG = "SUBSCRIPTION_TEST";
-
+        
         List<String> tags = new LinkedList<>();
         tags.add(COMMON_TAG);
 
diff --git a/bulletin-board-server/src/main/java/meerkat/bulletinboard/sqlserver/H2QueryProvider.java b/bulletin-board-server/src/main/java/meerkat/bulletinboard/sqlserver/H2QueryProvider.java
index f68548e..55faa8f 100644
--- a/bulletin-board-server/src/main/java/meerkat/bulletinboard/sqlserver/H2QueryProvider.java
+++ b/bulletin-board-server/src/main/java/meerkat/bulletinboard/sqlserver/H2QueryProvider.java
@@ -231,7 +231,7 @@ public class H2QueryProvider implements BulletinBoardSQLServer.SQLQueryProvider
         BasicDataSource dataSource = new BasicDataSource();
 
         dataSource.setDriverClassName("org.h2.Driver");
-        dataSource.setUrl("jdbc:h2:~/" + dbName);
+        dataSource.setUrl("jdbc:h2:mem:" + dbName);
 
         return dataSource;