diff --git a/Modules/Core/test/files.cmake b/Modules/Core/test/files.cmake
index d641b9f2f4..9aa105bf67 100644
--- a/Modules/Core/test/files.cmake
+++ b/Modules/Core/test/files.cmake
@@ -1,197 +1,198 @@
 # tests with no extra command line parameter
 set(MODULE_TESTS
   # IMPORTANT: If you plan to deactivate / comment out a test please write a bug number to the commented out line of code.
   #
   #     Example: #mitkMyTest #this test is commented out because of bug 12345
   #
   # It is important that the bug is open and that the test will be activated again before the bug is closed. This assures that
   # no test is forgotten after it was commented out. If there is no bug for your current problem, please add a new one and
   # mark it as critical.
 
   ################## DISABLED TESTS #################################################
   #mitkAbstractTransformGeometryTest.cpp #seems as tested class mitkExternAbstractTransformGeometry doesnt exist any more
   #mitkStateMachineContainerTest.cpp #rewrite test, indirect since no longer exported Bug 14529
   #mitkRegistrationBaseTest.cpp #tested class  mitkRegistrationBase doesn't exist any more
   #mitkSegmentationInterpolationTest.cpp #file doesn't exist!
   #mitkPipelineSmartPointerCorrectnessTest.cpp #file doesn't exist!
   #mitkITKThreadingTest.cpp #test outdated because itk::Semaphore was removed from ITK
   #mitkAbstractTransformPlaneGeometryTest.cpp #mitkVtkAbstractTransformPlaneGeometry doesn't exist any more
   #mitkTestUtilSharedLibrary.cpp #Linker problem with this test...
   #mitkTextOverlay2DSymbolsRenderingTest.cpp #Implementation of the tested feature is not finished yet. Ask Christoph or see bug 15104 for details.
 
   ################# RUNNING TESTS ###################################################
   mitkAccessByItkTest.cpp
   mitkCoreObjectFactoryTest.cpp
   mitkDataNodeTest.cpp
   mitkMaterialTest.cpp
   mitkActionTest.cpp
   mitkDispatcherTest.cpp
   mitkEnumerationPropertyTest.cpp
   mitkFileReaderRegistryTest.cpp
   #mitkFileWriterRegistryTest.cpp
   mitkFloatToStringTest.cpp
   mitkGenericPropertyTest.cpp
   mitkGeometry3DTest.cpp
   mitkGeometry3DEqualTest.cpp
   mitkGeometryDataIOTest.cpp
   mitkGeometryDataToSurfaceFilterTest.cpp
   mitkImageCastTest.cpp
   mitkImageDataItemTest.cpp
   mitkImageGeneratorTest.cpp
   mitkIOUtilTest.cpp
   mitkBaseDataTest.cpp
   mitkImportItkImageTest.cpp
   mitkGrabItkImageMemoryTest.cpp
   mitkInstantiateAccessFunctionTest.cpp
   mitkLevelWindowTest.cpp
   mitkMessageTest.cpp
   mitkPixelTypeTest.cpp
   mitkPlaneGeometryTest.cpp
   mitkPointSetTest.cpp
   mitkPointSetEqualTest.cpp
   mitkPointSetFileIOTest.cpp
   mitkPointSetOnEmptyTest.cpp
   mitkPointSetLocaleTest.cpp
   mitkPointSetWriterTest.cpp
   mitkPointSetPointOperationsTest.cpp
   mitkProgressBarTest.cpp
   mitkPropertyTest.cpp
   mitkPropertyListTest.cpp
   mitkPropertyPersistenceTest.cpp
   mitkPropertyPersistenceInfoTest.cpp
   mitkPropertyRelationRuleBaseTest.cpp
   mitkPropertyRelationsTest.cpp
   mitkSlicedGeometry3DTest.cpp
   mitkSliceNavigationControllerTest.cpp
   mitkSurfaceTest.cpp
   mitkSurfaceEqualTest.cpp
   mitkSurfaceToSurfaceFilterTest.cpp
   mitkTimeGeometryTest.cpp
   mitkProportionalTimeGeometryTest.cpp
   mitkUndoControllerTest.cpp
   mitkVtkWidgetRenderingTest.cpp
   mitkVerboseLimitedLinearUndoTest.cpp
   mitkWeakPointerTest.cpp
   mitkTransferFunctionTest.cpp
   mitkStepperTest.cpp
   mitkRenderingManagerTest.cpp
   mitkCompositePixelValueToStringTest.cpp
   vtkMitkThickSlicesFilterTest.cpp
   mitkNodePredicateSourceTest.cpp
   mitkNodePredicateDataPropertyTest.cpp
   mitkNodePredicateFunctionTest.cpp
   mitkVectorTest.cpp
   mitkClippedSurfaceBoundsCalculatorTest.cpp
   mitkExceptionTest.cpp
   mitkExtractSliceFilterTest.cpp
   mitkLogTest.cpp
   mitkImageDimensionConverterTest.cpp
   mitkLoggingAdapterTest.cpp
   mitkUIDGeneratorTest.cpp
   mitkPlanePositionManagerTest.cpp
   mitkAffineTransformBaseTest.cpp
   mitkPropertyAliasesTest.cpp
   mitkPropertyDescriptionsTest.cpp
   mitkPropertyExtensionsTest.cpp
   mitkPropertyFiltersTest.cpp
   mitkPropertyKeyPathTest.cpp
   mitkTinyXMLTest.cpp
   mitkRawImageFileReaderTest.cpp
   mitkInteractionEventTest.cpp
   mitkLookupTableTest.cpp
   mitkSTLFileReaderTest.cpp
   mitkPointTypeConversionTest.cpp
   mitkVectorTypeConversionTest.cpp
   mitkMatrixTypeConversionTest.cpp
   mitkArrayTypeConversionTest.cpp
   mitkSurfaceToImageFilterTest.cpp
   mitkBaseGeometryTest.cpp
   mitkImageToSurfaceFilterTest.cpp
   mitkEqualTest.cpp
   mitkLineTest.cpp
   mitkArbitraryTimeGeometryTest.cpp
   mitkItkImageIOTest.cpp
+  mitkLevelWindowManagerTest.cpp
   mitkVectorPropertyTest.cpp
   mitkTemporoSpatialStringPropertyTest.cpp
   mitkPropertyNameHelperTest.cpp
   mitkNodePredicateGeometryTest.cpp
   mitkNodePredicateSubGeometryTest.cpp
   mitkPreferenceListReaderOptionsFunctorTest.cpp
   mitkGenericIDRelationRuleTest.cpp
   mitkSourceImageRelationRuleTest.cpp
   mitkTemporalJoinImagesFilterTest.cpp
 )
 
 set(MODULE_RENDERING_TESTS
   mitkPointSetDataInteractorTest.cpp
   mitkSurfaceVtkMapper2DTest.cpp
   mitkSurfaceVtkMapper2D3DTest.cpp
 )
 
 # test with image filename as an extra command line parameter
 set(MODULE_IMAGE_TESTS
   mitkImageTimeSelectorTest.cpp #only runs on images
   mitkImageAccessorTest.cpp #only runs on images
 )
 
 set(MODULE_SURFACE_TESTS
   mitkSurfaceVtkWriterTest.cpp #only runs on surfaces
 )
 
 # list of images for which the tests are run
 set(MODULE_TESTIMAGE
   US4DCyl.nrrd
   Pic3D.nrrd
   Pic2DplusT.nrrd
   BallBinary30x30x30.nrrd
   Png2D-bw.png
 )
 set(MODULE_TESTSURFACE
   binary.stl
   ball.stl
 )
 
 set(MODULE_CUSTOM_TESTS
     mitkDataStorageTest.cpp
     mitkDataNodeTest.cpp
     mitkEventConfigTest.cpp
     mitkPointSetLocaleTest.cpp
     mitkImageTest.cpp
     mitkImageVtkMapper2DTest.cpp
     mitkImageVtkMapper2DLevelWindowTest.cpp
     mitkImageVtkMapper2DOpacityTest.cpp
     mitkImageVtkMapper2DResliceInterpolationPropertyTest.cpp
     mitkImageVtkMapper2DColorTest.cpp
     mitkImageVtkMapper2DSwivelTest.cpp
     mitkImageVtkMapper2DTransferFunctionTest.cpp
     mitkImageVtkMapper2DOpacityTransferFunctionTest.cpp
     mitkImageVtkMapper2DLookupTableTest.cpp
     mitkSurfaceVtkMapper3DTest.cpp
     mitkVolumeCalculatorTest.cpp
     mitkLevelWindowManagerTest.cpp
     mitkPointSetVtkMapper2DTest.cpp
     mitkPointSetVtkMapper2DImageTest.cpp
     mitkPointSetVtkMapper2DGlyphTypeTest.cpp
     mitkPointSetVtkMapper2DTransformedPointsTest.cpp
     mitkVTKRenderWindowSizeTest.cpp
     mitkMultiComponentImageDataComparisonFilterTest.cpp
     mitkImageToItkTest.cpp
     mitkImageSliceSelectorTest.cpp
     mitkPointSetReaderTest.cpp
     mitkImageEqualTest.cpp
     mitkRotatedSlice4DTest.cpp
     mitkPlaneGeometryDataMapper2DTest.cpp
 )
 
 # Currently not working on windows because of a rendering timing issue
 # see bug 18083 for details
 if(NOT WIN32)
  set(MODULE_CUSTOM_TESTS ${MODULE_CUSTOM_TESTS} mitkSurfaceDepthSortingTest.cpp)
 endif()
 
 set(RESOURCE_FILES
   Interactions/AddAndRemovePoints.xml
   Interactions/globalConfig.xml
   Interactions/StatemachineTest.xml
   Interactions/StatemachineConfigTest.xml
 )
diff --git a/Modules/Core/test/mitkLevelWindowManagerTest.cpp b/Modules/Core/test/mitkLevelWindowManagerTest.cpp
new file mode 100644
index 0000000000..d0df3f1b1d
--- /dev/null
+++ b/Modules/Core/test/mitkLevelWindowManagerTest.cpp
@@ -0,0 +1,415 @@
+/*============================================================================
+
+The Medical Imaging Interaction Toolkit (MITK)
+
+Copyright (c) German Cancer Research Center (DKFZ)
+All rights reserved.
+
+Use of this source code is governed by a 3-clause BSD license that can be
+found in the LICENSE file.
+
+============================================================================*/
+
+#include <mitkTestFixture.h>
+#include <mitkTestingMacros.h>
+
+#include <mitkIOUtil.h>
+#include <mitkLevelWindowManager.h>
+#include <mitkRenderingModeProperty.h>
+#include <mitkStandaloneDataStorage.h>
+
+#include <itkComposeImageFilter.h>
+#include <itkEventObject.h>
+#include <itkImageDuplicator.h>
+#include <itkImageIterator.h>
+#include <mitkImageCast.h>
+
+class mitkLevelWindowManagerTestSuite : public mitk::TestFixture
+{
+  CPPUNIT_TEST_SUITE(mitkLevelWindowManagerTestSuite);
+  MITK_TEST(TestModes);
+  MITK_TEST(TestSetLevelWindowProperty);
+  MITK_TEST(TestVisibilityPropertyChanged);
+  MITK_TEST(TestLayerPropertyChanged);
+  MITK_TEST(TestImageRenderingModePropertyChanged);
+  MITK_TEST(TestImageForLevelWindowPropertyChanged);
+  MITK_TEST(TestSelectedPropertyChanged);
+  MITK_TEST(TestRemoveDataNodes);
+  MITK_TEST(TestCombinedPropertiesChanged);
+  //MITK_TEST(TestMultiComponentRescaling);
+
+  CPPUNIT_TEST_SUITE_END();
+
+private:
+
+  mitk::LevelWindowManager::Pointer m_LevelWindowManager;
+  mitk::StandaloneDataStorage::Pointer m_DataManager;
+
+  std::string m_ImagePath1;
+  std::string m_ImagePath2;
+  std::string m_ImagePath3;
+
+  mitk::DataNode::Pointer m_DataNode1;
+  mitk::DataNode::Pointer m_DataNode2;
+  mitk::DataNode::Pointer m_DataNode3;
+
+  mitk::Image::Pointer m_mitkMultiComponentImage;
+  mitk::Image::Pointer m_mitkImageComponent1;
+  mitk::Image::Pointer m_mitkImageComponent2;
+
+  bool AssertImageForLevelWindowProperty(bool assert1, bool assert2, bool assert3)
+  {
+    bool imageForLevelWindowProperty1, imageForLevelWindowProperty2, imageForLevelWindowProperty3;
+
+    m_DataNode1->GetBoolProperty("imageForLevelWindow", imageForLevelWindowProperty1);
+    m_DataNode2->GetBoolProperty("imageForLevelWindow", imageForLevelWindowProperty2);
+    m_DataNode3->GetBoolProperty("imageForLevelWindow", imageForLevelWindowProperty3);
+    
+    return (assert1 == imageForLevelWindowProperty1) &&
+           (assert2 == imageForLevelWindowProperty2) &&
+           (assert3 == imageForLevelWindowProperty3);
+  }
+
+  bool AssertLevelWindowProperty(bool assert1, bool assert2, bool assert3)
+  {
+    auto levelWindowProperty1 =
+      dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode1->GetProperty("levelwindow"));
+    auto levelWindowProperty2 =
+      dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode2->GetProperty("levelwindow"));
+    auto levelWindowProperty3 =
+      dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode3->GetProperty("levelwindow"));
+
+    // Check if the active level window property of the manager is equal to any of the level window properties of the nodes
+    auto managerLevelWindowProperty = m_LevelWindowManager->GetLevelWindowProperty();
+    
+    return (assert1 == (managerLevelWindowProperty == levelWindowProperty1)) &&
+           (assert2 == (managerLevelWindowProperty == levelWindowProperty2)) &&
+           (assert3 == (managerLevelWindowProperty == levelWindowProperty3));
+  }
+
+public:
+
+  void setUp() override
+  {
+    m_LevelWindowManager = mitk::LevelWindowManager::New();
+    m_DataManager = mitk::StandaloneDataStorage::New();
+
+    CPPUNIT_ASSERT_NO_THROW_MESSAGE("DataStorage could not be set for the new level window manager", m_LevelWindowManager->SetDataStorage(m_DataManager));
+    CPPUNIT_ASSERT_MESSAGE("DataStorage could not be retrieved from the new level window manager", m_DataManager == m_LevelWindowManager->GetDataStorage());
+
+    m_ImagePath1 = GetTestDataFilePath("Pic3D.nrrd");
+    m_ImagePath2 = GetTestDataFilePath("UltrasoundImages/4D_TEE_Data_MV.dcm");
+    m_ImagePath3 = GetTestDataFilePath("RenderingTestData/defaultWatermark.png");
+
+    // add multiple objects to the data storage => property observers will be created
+    m_DataNode1 = mitk::IOUtil::Load(m_ImagePath1, *m_DataManager)->GetElement(0);
+    m_DataNode2 = mitk::IOUtil::Load(m_ImagePath2, *m_DataManager)->GetElement(0);
+    CPPUNIT_ASSERT_MESSAGE("Not two relevant nodes found in the data storage",
+      m_LevelWindowManager->GetRelevantNodes()->size() == 2);
+    CPPUNIT_ASSERT_MESSAGE("Not two observers created for the relevant nodes",
+      m_LevelWindowManager->GetNumberOfObservers() == 2);
+
+    m_DataNode1->SetIntProperty("layer", 1);
+    m_DataNode2->SetIntProperty("layer", 2);
+
+    bool isImageForLevelWindow1, isImageForLevelWindow2;
+    m_DataNode1->GetBoolProperty("imageForLevelWindow", isImageForLevelWindow1);
+    m_DataNode2->GetBoolProperty("imageForLevelWindow", isImageForLevelWindow2);
+    CPPUNIT_ASSERT_MESSAGE("Initial \"imageForLevelWindow\" property not exclusively set for node 2",
+      !isImageForLevelWindow1 && isImageForLevelWindow2);
+
+    m_DataNode3 = mitk::IOUtil::Load(m_ImagePath3, *m_DataManager)->GetElement(0);
+    CPPUNIT_ASSERT_MESSAGE("Not three relevant nodes found in the data storage",
+      m_LevelWindowManager->GetRelevantNodes()->size() == 3);
+    CPPUNIT_ASSERT_MESSAGE("Not three observers created for the relevant nodes",
+      m_LevelWindowManager->GetNumberOfObservers() == 3);
+
+    m_DataNode3->SetIntProperty("layer", 3);
+    AssertImageForLevelWindowProperty(false, false, true);
+  }
+
+  void tearDown() override {}
+
+  void TestModes()
+  {
+    CPPUNIT_ASSERT_MESSAGE("AutoTopMost mode is not enabled per default", m_LevelWindowManager->IsAutoTopMost());
+    CPPUNIT_ASSERT_MESSAGE("SelectedImagesMode mode is not disabled per default", !m_LevelWindowManager->IsSelectedImages());
+
+    m_LevelWindowManager->SetSelectedImages(true);
+    CPPUNIT_ASSERT_MESSAGE("AutoTopMost mode was not disabled on mode switch", !m_LevelWindowManager->IsAutoTopMost());
+    CPPUNIT_ASSERT_MESSAGE("SelectedImagesMode mode was not enabled on mode switch", m_LevelWindowManager->IsSelectedImages());
+
+    m_LevelWindowManager->SetSelectedImages(false);
+    CPPUNIT_ASSERT_MESSAGE("AutoTopMost mode was not disabled on mode switch", !m_LevelWindowManager->IsAutoTopMost());
+    CPPUNIT_ASSERT_MESSAGE("SelectedImagesMode mode was not disabled on mode switch", !m_LevelWindowManager->IsSelectedImages());
+
+    m_LevelWindowManager->SetSelectedImages(true); // to enable "SelectedImagesMode"
+    m_LevelWindowManager->SetAutoTopMostImage(true);
+    CPPUNIT_ASSERT_MESSAGE("AutoTopMost mode was not enabled on mode switch", m_LevelWindowManager->IsAutoTopMost());
+    CPPUNIT_ASSERT_MESSAGE("SelectedImagesMode mode was not disabled on mode switch", !m_LevelWindowManager->IsSelectedImages());
+  }
+
+  void TestSetLevelWindowProperty()
+  {
+    m_LevelWindowManager->SetAutoTopMostImage(false);
+
+    // Setting the level window property of the manager
+    // will make the corresponding node be the "imageForLevelWindow" node.
+    auto levelWindowProperty = dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode1->GetProperty("levelwindow"));
+    m_LevelWindowManager->SetLevelWindowProperty(levelWindowProperty);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    levelWindowProperty = dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode2->GetProperty("levelwindow"));
+    m_LevelWindowManager->SetLevelWindowProperty(levelWindowProperty);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    levelWindowProperty = dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode3->GetProperty("levelwindow"));
+    m_LevelWindowManager->SetLevelWindowProperty(levelWindowProperty);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+
+    levelWindowProperty = mitk::LevelWindowProperty::New();
+    //CPPUNIT_ASSERT_THROW_MESSAGE("Expected exception for an invalid level window property was not thrown",
+      //m_LevelWindowManager->SetLevelWindowProperty(levelWindowProperty), mitk::Exception);
+  }
+
+  void TestVisibilityPropertyChanged()
+  {
+    // Hiding a node will make the "next" node be the "imageForLevelWindow" node, if
+    // the hidden node was the "imageForLevelWindow" node before. "Next" is dependent on the node layer.
+    m_DataNode3->SetVisibility(false);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode2->SetVisibility(false);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode1->SetVisibility(false);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("LevelWindowProperty is not null", !m_LevelWindowManager->GetLevelWindowProperty());
+
+    m_DataNode3->SetVisibility(true);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+  }
+
+  void TestLayerPropertyChanged()
+  {
+    m_DataNode3->SetIntProperty("layer", itk::NumericTraits<int>::min());
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode2->SetIntProperty("layer", itk::NumericTraits<int>::min());
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode1->SetIntProperty("layer", itk::NumericTraits<int>::min());
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("LevelWindowProperty is not null", !m_LevelWindowManager->GetLevelWindowProperty());
+
+    m_DataNode3->SetIntProperty("layer", 1);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+  }
+
+  void TestImageRenderingModePropertyChanged()
+  {
+    // checking the default rendering mode
+    auto renderingMode = dynamic_cast<mitk::RenderingModeProperty*>(m_DataNode3->GetProperty("Image Rendering.Mode"));
+    CPPUNIT_ASSERT_MESSAGE("Initial \"Image Rendering.Mode\" property not set to \"RenderingModeProperty::LOOKUPTABLE_LEVELWINDOW_COLOR\"",
+      mitk::RenderingModeProperty::LOOKUPTABLE_LEVELWINDOW_COLOR == renderingMode->GetRenderingMode());
+
+    // Changing the "Image Rendering.Mode" of a node to either "LOOKUPTABLE_COLOR" or
+    // "COLORTRANSFERFUNCTION_COLOR" will ignore this node for the level window 
+    m_DataNode3->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::LOOKUPTABLE_COLOR));
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode2->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::COLORTRANSFERFUNCTION_COLOR));
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode1->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::LOOKUPTABLE_COLOR));
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("LevelWindowProperty is not null", !m_LevelWindowManager->GetLevelWindowProperty());
+
+    m_DataNode3->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::COLORTRANSFERFUNCTION_LEVELWINDOW_COLOR));
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+  }
+
+  void TestImageForLevelWindowPropertyChanged()
+  {
+    m_LevelWindowManager->SetAutoTopMostImage(false);
+
+    m_DataNode1->SetBoolProperty("imageForLevelWindow", true);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode2->SetBoolProperty("imageForLevelWindow", true);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode3->SetBoolProperty("imageForLevelWindow", true);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+
+    // The top level node will alsways be used as a fall back node
+    // if no specific mode is selected.
+    m_DataNode3->SetBoolProperty("imageForLevelWindow", false);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+  }
+
+  void TestSelectedPropertyChanged()
+  {
+    // Selecting a node will make this node be the "imageForLevelWindow" node, if
+    // the "SelectedImagesMode" is enabled (disabled per default).
+    m_DataNode1->SetSelected(true); // selection mode not enabled - node3 stays the "imageForLevelWindow" node
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+
+    // This will immediately check for the selected node (node 1).
+    m_LevelWindowManager->SetSelectedImages(true);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode2->SetSelected(true);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode3->SetSelected(true);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+
+    m_DataNode1->SetSelected(false);
+    m_DataNode2->SetSelected(false);
+    m_DataNode3->SetSelected(false);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("LevelWindowProperty is not null", !m_LevelWindowManager->GetLevelWindowProperty());
+  }
+
+  void TestCombinedPropertiesChanged()
+  {
+    m_LevelWindowManager->SetSelectedImages(true);
+    m_DataNode1->SetSelected(true); // selection mode enabled - node1 becomes the "imageForLevelWindow" node
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode2->SetIntProperty("layer", itk::NumericTraits<int>::max()); // selection mode enabled - node1 stays the "imageForLevelWindow" node
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode1->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::COLORTRANSFERFUNCTION_COLOR)); // selection mode enabled - but node1 is ignored - no active level window property
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+
+    m_DataNode3->SetBoolProperty("imageForLevelWindow", true); // selection mode enabled - no valid node selected, no active level window property
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+
+    m_LevelWindowManager->SetSelectedImages(false); // no mode enabled - however, level window is not modified / updated
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+
+    m_LevelWindowManager->Update(itk::ModifiedEvent()); // no mode enabled - level window is modified / updated with topmost visible node2 as fallback
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode3->SetBoolProperty("imageForLevelWindow", true); // no mode enabled - use node3 with "imageForLevelWindow" property set
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+
+    m_DataNode3->SetVisibility(false); // node3 with "imageForLevelWindow" property not visible - use topmost visible node2 as fallback
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode2->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::LOOKUPTABLE_COLOR)); // fallback node2 is ignored - but "imageForLevelWindow" and "levelWindow" stay "true" for node2
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_LevelWindowManager->SetAutoTopMostImage(true); // no visible node exists that is not ignored
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, false));
+
+    auto levelWindowProperty = dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode3->GetProperty("levelwindow"));
+    m_LevelWindowManager->SetLevelWindowProperty(levelWindowProperty); // explicitely set the level window to node3
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+
+    m_DataNode1->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::COLORTRANSFERFUNCTION_LEVELWINDOW_COLOR)); // auto topmost mode enabled - node1 is the only visible non-ignored node
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode2->SetProperty("Image Rendering.Mode", mitk::RenderingModeProperty::New(
+      mitk::RenderingModeProperty::LOOKUPTABLE_LEVELWINDOW_COLOR)); // auto topmost mode enabled - node2 is topmost visible node
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, true, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, true, false));
+
+    m_DataNode2->SetIntProperty("layer", itk::NumericTraits<int>::min()); // auto topmost mode enabled - node1 is topmost visible node
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(true, false, false));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(true, false, false));
+
+    m_DataNode3->SetVisibility(true); // auto topmost mode enabled - node3 is topmost visible node
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", AssertImageForLevelWindowProperty(false, false, true));
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set", AssertLevelWindowProperty(false, false, true));
+
+  }
+
+  void TestRemoveDataNodes()
+  {
+    m_DataManager->Remove(m_DataNode3);
+    CPPUNIT_ASSERT_MESSAGE("Node not correctly removed", m_LevelWindowManager->GetRelevantNodes()->size() == 2);
+    CPPUNIT_ASSERT_MESSAGE("Observer not correctly removed", m_LevelWindowManager->GetNumberOfObservers() == 2);
+
+    bool isImageForLevelWindow1, isImageForLevelWindow2;
+    m_DataNode1->GetBoolProperty("imageForLevelWindow", isImageForLevelWindow1);
+    m_DataNode2->GetBoolProperty("imageForLevelWindow", isImageForLevelWindow2);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set",
+                           !isImageForLevelWindow1 && isImageForLevelWindow2);
+
+    auto levelWindowProperty1 =
+      dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode1->GetProperty("levelwindow"));
+    auto levelWindowProperty2 =
+      dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode2->GetProperty("levelwindow"));
+    auto managerLevelWindowProperty = m_LevelWindowManager->GetLevelWindowProperty();
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set",
+      (false == (managerLevelWindowProperty == levelWindowProperty1)) &&
+      (true == (managerLevelWindowProperty == levelWindowProperty2)));
+
+    m_DataManager->Remove(m_DataNode2);
+    CPPUNIT_ASSERT_MESSAGE("Node not correctly removed", m_LevelWindowManager->GetRelevantNodes()->size() == 1);
+    CPPUNIT_ASSERT_MESSAGE("Observer not correctly removed", m_LevelWindowManager->GetNumberOfObservers() == 1);
+
+    m_DataNode1->GetBoolProperty("imageForLevelWindow", isImageForLevelWindow1);
+    CPPUNIT_ASSERT_MESSAGE("\"imageForLevelWindow\" property not correctly set", isImageForLevelWindow1);
+
+    levelWindowProperty1 =
+      dynamic_cast<mitk::LevelWindowProperty *>(m_DataNode1->GetProperty("levelwindow"));
+    managerLevelWindowProperty = m_LevelWindowManager->GetLevelWindowProperty();
+    CPPUNIT_ASSERT_MESSAGE("\"levelwindow\" property not correctly set",
+      true == (managerLevelWindowProperty == levelWindowProperty1));
+
+    m_DataManager->Remove(m_DataNode1);
+    CPPUNIT_ASSERT_MESSAGE("Node not correctly removed", m_LevelWindowManager->GetRelevantNodes()->size() == 0);
+    CPPUNIT_ASSERT_MESSAGE("Observer not correctly removed", m_LevelWindowManager->GetNumberOfObservers() == 0);
+
+    CPPUNIT_ASSERT_MESSAGE("LevelWindowProperty is not null", !m_LevelWindowManager->GetLevelWindowProperty());
+  }
+};
+
+MITK_TEST_SUITE_REGISTRATION(mitkLevelWindowManager)