diff --git a/src/main/java/org/eclipse/openk/contactbasedata/service/InitPropertyLogger.java b/src/main/java/org/eclipse/openk/contactbasedata/service/InitPropertyLogger.java
index 92552b2..4399cfe 100644
--- a/src/main/java/org/eclipse/openk/contactbasedata/service/InitPropertyLogger.java
+++ b/src/main/java/org/eclipse/openk/contactbasedata/service/InitPropertyLogger.java
@@ -1,13 +1,10 @@
 package org.eclipse.openk.contactbasedata.service;
 
 import lombok.extern.log4j.Log4j2;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.springframework.boot.env.OriginTrackedMapPropertySource;
 import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.context.event.EventListener;
 import org.springframework.core.env.AbstractEnvironment;
-import org.springframework.core.env.EnumerablePropertySource;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.MutablePropertySources;
 import org.springframework.stereotype.Component;
diff --git a/src/main/java/org/eclipse/openk/contactbasedata/service/LdapService.java b/src/main/java/org/eclipse/openk/contactbasedata/service/LdapService.java
index 891a993..cc67420 100644
--- a/src/main/java/org/eclipse/openk/contactbasedata/service/LdapService.java
+++ b/src/main/java/org/eclipse/openk/contactbasedata/service/LdapService.java
@@ -118,20 +118,18 @@
             String uidTblInternalPerson = tblInternalPerson.getUid();
             List<LdapUser> ldapUserByUIDResult = getLdapUserByUID(uidTblInternalPerson);
 
-            if(ldapUserByUIDResult.size() == 0){
+            if(ldapUserByUIDResult.isEmpty()){
                 String errorMsg = String.format("[LDAP Sync Error] User with Uid: [ %s ] can not be found in LDAP", uidTblInternalPerson);
                 setNoteAndLogSyncError(allNotExistingLdapUsers, tblInternalPerson, errorMsg);
-                continue;
             }
-
-            if(ldapUserByUIDResult.size() > 1){
+            else if(ldapUserByUIDResult.size() > 1){
                 String errorMsg = String.format("[LDAP Sync Error] More than one result for UID: [ %s ] in LDAP", uidTblInternalPerson);
                 setNoteAndLogSyncError(allNotExistingLdapUsers, tblInternalPerson, errorMsg);
-                continue;
             }
-
-            LdapUser ldapUser = ldapUserByUIDResult.get(0);
-            allFoundLdapUsers.add(ldapUser);
+            else {
+                LdapUser ldapUser = ldapUserByUIDResult.get(0);
+                allFoundLdapUsers.add(ldapUser);
+            }
         }
     }
 
diff --git a/src/main/java/org/eclipse/openk/contactbasedata/service/util/LdapUserAttributesMapper.java b/src/main/java/org/eclipse/openk/contactbasedata/service/util/LdapUserAttributesMapper.java
index 4bd38f6..3827a14 100644
--- a/src/main/java/org/eclipse/openk/contactbasedata/service/util/LdapUserAttributesMapper.java
+++ b/src/main/java/org/eclipse/openk/contactbasedata/service/util/LdapUserAttributesMapper.java
@@ -53,10 +53,6 @@
     @Value("${ldap-sync.attribute-mapping.telephone-number}")
     private String telephoneNumber;
 
-    @Value("${ldap-sync.attribute-mapping.password}")
-    private String password;
-
-
     @Override
     public LdapUser mapFromAttributes(Attributes attributes) throws NamingException {
         LdapUser ldapUser = new LdapUser();
@@ -93,10 +89,6 @@
         if (attribute != null) {
             ldapUser.setMail((String) attribute.get());
         }
-        attribute = attributes.get(password);
-        if (attribute != null) {
-            ldapUser.setPassword((byte[]) attribute.get());
-        }
 
         return ldapUser;
     }
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 296afa7..0c70ee9 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -34,7 +34,6 @@
     mail: mail
     department: department
     telephone-number: phone
-    password: userpassword
   db-id-mapping:
     mail-id: 1
     telephone-number-id: 2
diff --git a/src/test/java/org/eclipse/openk/contactbasedata/config/TestConfiguration.java b/src/test/java/org/eclipse/openk/contactbasedata/config/TestConfiguration.java
index 8d0468d..7056b3a 100644
--- a/src/test/java/org/eclipse/openk/contactbasedata/config/TestConfiguration.java
+++ b/src/test/java/org/eclipse/openk/contactbasedata/config/TestConfiguration.java
@@ -17,10 +17,13 @@
 import org.eclipse.openk.contactbasedata.ContactBaseDataApplication;
 import org.eclipse.openk.contactbasedata.mapper.*;
 import org.eclipse.openk.contactbasedata.service.*;
+import org.eclipse.openk.contactbasedata.service.util.LdapUserAttributesMapper;
 import org.springframework.boot.autoconfigure.domain.EntityScan;
 import org.springframework.boot.test.context.ConfigFileApplicationContextInitializer;
+import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.ldap.core.LdapTemplate;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.TestPropertySource;
 
@@ -72,6 +75,12 @@
     AssignmentModulContactMapper assignmentModulContactMapper() { return new AssignmentModulContactMapperImpl(); }
 
     @Bean
+    LdapUserAttributesMapper ldapUserAttributesMapper() { return new LdapUserAttributesMapper(); };
+
+    @MockBean
+    private LdapTemplate ldapTemplate;
+
+    @Bean
     public VersionService myVersionService() {
         return new VersionService();
     }
@@ -117,4 +126,7 @@
 
     @Bean
     public ContactAnonymizerService myContactAnonymizerService() { return new ContactAnonymizerService(); }
+
+    @Bean
+    public LdapService myLdapService() { return new LdapService(); }
 }
diff --git a/src/test/java/org/eclipse/openk/contactbasedata/service/LdapServiceTest.java b/src/test/java/org/eclipse/openk/contactbasedata/service/LdapServiceTest.java
new file mode 100644
index 0000000..1e03724
--- /dev/null
+++ b/src/test/java/org/eclipse/openk/contactbasedata/service/LdapServiceTest.java
@@ -0,0 +1,182 @@
+/*
+ *******************************************************************************
+ * Copyright (c) 2019 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************
+ */
+package org.eclipse.openk.contactbasedata.service;
+
+import org.assertj.core.util.Lists;
+import org.eclipse.openk.contactbasedata.config.TestConfiguration;
+import org.eclipse.openk.contactbasedata.model.RefCommunicationType;
+import org.eclipse.openk.contactbasedata.model.TblInternalPerson;
+import org.eclipse.openk.contactbasedata.repository.CommunicationTypeRepository;
+import org.eclipse.openk.contactbasedata.repository.InternalPersonRepository;
+import org.eclipse.openk.contactbasedata.service.util.LdapUserAttributesMapper;
+import org.eclipse.openk.contactbasedata.support.MockDataHelper;
+import org.eclipse.openk.contactbasedata.viewmodel.LdapUser;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.mockito.stubbing.Answer;
+import org.powermock.reflect.Whitebox;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.ldap.core.LdapTemplate;
+import org.springframework.ldap.query.LdapQuery;
+import org.springframework.test.context.ContextConfiguration;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.when;
+
+@DataJpaTest
+@ContextConfiguration(classes = {TestConfiguration.class})
+
+public class LdapServiceTest {
+    private static final long MAIL_ID = 1L;
+    private static final long TEL_ID = 2L;
+
+    @Qualifier("myLdapService")
+    @Autowired
+    private LdapService ldapService;
+
+    @Autowired
+    private LdapUserAttributesMapper ldapUserAttributesMapper;
+
+    @MockBean
+    private InternalPersonService internalPersonService;
+
+    @MockBean
+    private InternalPersonRepository internalPersonRepository;
+
+    @MockBean
+    private CommunicationTypeRepository communicationTypeRepository;
+
+    @Autowired
+    private LdapTemplate ldapTemplate;
+
+    @Test
+    public void shouldSynchronizeLDAPRunThrou1() {
+        when(internalPersonRepository.saveAll(any( List.class ))).thenReturn(Lists.emptyList());
+        List<TblInternalPerson> internalPeople = MockDataHelper.mockTblInternalPersonPage().getContent();
+        when( internalPersonRepository.findByUidNotNull() ).thenReturn(internalPeople);
+
+        List<LdapUser> ldapUserList = new ArrayList<>(1);
+        LdapUser ldapUser = MockDataHelper.mockLdapUser();
+        ldapUser.setUid(internalPeople.get(0).getUid());
+        ldapUserList.add( ldapUser );
+        // users are found
+        when( ldapTemplate.search(any(LdapQuery.class), any(LdapUserAttributesMapper.class))).thenReturn( ldapUserList );
+
+        List<RefCommunicationType> refCommunicationTypes = MockDataHelper.mockRefCommunicationTypeList();
+        Whitebox.setInternalState(ldapService, "mailId", MAIL_ID);
+        Whitebox.setInternalState(ldapService, "telephoneNumberId", TEL_ID);
+        refCommunicationTypes.get(1).setId(TEL_ID);
+        refCommunicationTypes.get(2).setId(MAIL_ID);
+        when( communicationTypeRepository.findAll()).thenReturn(refCommunicationTypes);
+
+        when(internalPersonRepository.saveAll(any( List.class)))
+                .then((Answer<List<TblInternalPerson>>) invocation -> {
+                    Object[] args = invocation.getArguments();
+                    return (List<TblInternalPerson>) args[0];
+                });
+
+
+        ldapService.synchronizeLDAP();
+        Mockito.verify(internalPersonRepository, times(2)).saveAll(any(List.class));
+    }
+
+    @Test
+    public void shouldSynchronizeLDAPRunThrou2() {
+
+        when(internalPersonRepository.saveAll(any( List.class ))).thenReturn(Lists.emptyList());
+        List<TblInternalPerson> internalPeople = MockDataHelper.mockTblInternalPersonPage().getContent();
+        when( internalPersonRepository.findByUidNotNull() ).thenReturn(internalPeople);
+
+        // users are not found
+        when( ldapTemplate.search(any(LdapQuery.class), any(LdapUserAttributesMapper.class))).thenReturn( Lists.emptyList() );
+
+        List<RefCommunicationType> refCommunicationTypes = MockDataHelper.mockRefCommunicationTypeList();
+        Whitebox.setInternalState(ldapService, "mailId", MAIL_ID);
+        Whitebox.setInternalState(ldapService, "telephoneNumberId", TEL_ID);
+        refCommunicationTypes.get(1).setId(TEL_ID);
+        refCommunicationTypes.get(2).setId(MAIL_ID);
+        when( communicationTypeRepository.findAll()).thenReturn(refCommunicationTypes);
+
+        ldapService.synchronizeLDAP();
+        Mockito.verify(internalPersonRepository, times(2)).saveAll(any(List.class));
+
+    }
+
+    @Test
+    public void shouldFindExistingAndNotExistingLdapUsers1() throws Exception {
+        List<TblInternalPerson> internalPeople = MockDataHelper.mockTblInternalPersonPage().getContent();
+        List<LdapUser> ldapUsers = new ArrayList<>();
+        List<TblInternalPerson> allNotExistingLdapUsers = new ArrayList<>();
+
+        List<LdapUser> ldapUserList = new ArrayList<>(1);
+        LdapUser ldapUser = MockDataHelper.mockLdapUser();
+        ldapUser.setUid(internalPeople.get(0).getUid());
+        ldapUserList.add( ldapUser );
+        // users are always found
+        when( ldapTemplate.search(any(LdapQuery.class), any(LdapUserAttributesMapper.class))).thenReturn( ldapUserList );
+
+        Whitebox.invokeMethod(ldapService, "findExistingAndNotExistingLdapUsers",
+                internalPeople, ldapUsers, allNotExistingLdapUsers);
+
+        assertEquals( internalPeople.size(), ldapUsers.size());
+        assertEquals( ldapUser, ldapUsers.get(0));
+        assertEquals( ldapUser, ldapUsers.get(1));
+    }
+
+    @Test
+    public void shouldFindExistingAndNotExistingLdapUsers2() throws Exception {
+        List<TblInternalPerson> internalPeople = MockDataHelper.mockTblInternalPersonPage().getContent();
+        List<LdapUser> ldapUsers = new ArrayList<>();
+        List<TblInternalPerson> allNotExistingLdapUsers = new ArrayList<>();
+
+        // users are not found
+        when( ldapTemplate.search(any(LdapQuery.class), any(LdapUserAttributesMapper.class))).thenReturn( Lists.emptyList() );
+
+        Whitebox.invokeMethod(ldapService, "findExistingAndNotExistingLdapUsers",
+                internalPeople, ldapUsers, allNotExistingLdapUsers);
+
+        assertEquals( 0, ldapUsers.size());
+    }
+
+
+    @Test
+    public void shouldFindExistingAndNotExistingLdapUsers3() throws Exception {
+        List<TblInternalPerson> internalPeople = MockDataHelper.mockTblInternalPersonPage().getContent();
+        List<LdapUser> ldapUsers = new ArrayList<>();
+        List<TblInternalPerson> allNotExistingLdapUsers = new ArrayList<>();
+
+        List<LdapUser> ldapUserList = new ArrayList<>(1);
+        LdapUser ldapUser = MockDataHelper.mockLdapUser();
+        ldapUser.setUid(internalPeople.get(0).getUid());
+        ldapUserList.add( ldapUser );
+        ldapUserList.add( new LdapUser());
+        // too much users are found
+        when( ldapTemplate.search(any(LdapQuery.class), any(LdapUserAttributesMapper.class))).thenReturn( ldapUserList );
+
+        Whitebox.invokeMethod(ldapService, "findExistingAndNotExistingLdapUsers",
+                internalPeople, ldapUsers, allNotExistingLdapUsers);
+
+        assertEquals( 0, ldapUsers.size());
+    }
+
+}
diff --git a/src/test/java/org/eclipse/openk/contactbasedata/support/MockDataHelper.java b/src/test/java/org/eclipse/openk/contactbasedata/support/MockDataHelper.java
index 54e216e..bde9bac 100644
--- a/src/test/java/org/eclipse/openk/contactbasedata/support/MockDataHelper.java
+++ b/src/test/java/org/eclipse/openk/contactbasedata/support/MockDataHelper.java
@@ -364,8 +364,9 @@
         ct2.setDescription("Mobil");
         ct2.setType("Mobil");
         RefCommunicationType ct3 = mockRefCommunicationType();
-        ct3.setDescription("Pers�nlich");
-        ct3.setType("Pers�nlich");
+        ct3.setDescription("E-Mail");
+        ct3.setType("E-Mail");
+        ct3.setTypeEmail(true);
 
         List<RefCommunicationType> listCt = new ArrayList<>();
         listCt.add(ct1);
@@ -725,4 +726,26 @@
         return list;
     }
 
+    public static LdapUser mockLdapUser() {
+        LdapUser ldapUser = new LdapUser();
+        ldapUser.setUid( UUID.randomUUID().toString() );
+        ldapUser.setFirstName("Ludwig");
+        ldapUser.setLastName("Lumpensammler");
+        ldapUser.setMail("ll@lumpi.de");
+
+        return ldapUser;
+    }
+
+    public static List<LdapUser> mockLdapUsers() {
+        List<LdapUser> list = new ArrayList<>();
+        LdapUser ldapUser2 = new LdapUser();
+        ldapUser2.setUid( UUID.randomUUID().toString() );
+        ldapUser2.setFirstName("Karl");
+        ldapUser2.setLastName("Kleinfink");
+        ldapUser2.setTelephoneNumber("99887766");
+        list.add( mockLdapUser() );
+        list.add( ldapUser2 );
+        return list;
+    }
+
 }