@Test
 public void testFindAvailableAttributes1() {
   List<Attribute> attrs =
       attributeService.findAvailableAttributes(AttributeGroupNames.PRODUCT, null); // getByKey all
   assertEquals(24, attrs.size());
   List<String> assignedAttributes = new ArrayList<String>();
   for (Attribute attr : attrs) {
     assignedAttributes.add(attr.getCode());
   }
   attrs =
       attributeService.findAvailableAttributes(AttributeGroupNames.PRODUCT, assignedAttributes);
   assertEquals(0, attrs.size());
 }
 /**
  * Prove of availability to getByKey list of available attributes within given <code>
  * attributeGroupCode</code>, that can be assigned to business entity.
  */
 @Test
 public void testFindAvailableAttributes2() {
   List<String> allCodes =
       Arrays.asList(
           "URI",
           "CATEGORY_ITEMS_PER_PAGE",
           "CATEGORY_IMAGE_RETRIEVE_STRATEGY",
           "CATEGORY_IMAGE0",
           "CATEGORY_DESCRIPTION_en",
           "CATEGORY_DESCRIPTION_ru",
           "CONTENT_BODY_ru_1",
           "CONTENT_BODY_ru_2",
           "CONTENT_BODY_en_1",
           "CONTENT_BODY_en_2");
   // getByKey all attributes available for category
   List<Attribute> attributes =
       attributeService.findAvailableAttributes(AttributeGroupNames.CATEGORY, null);
   assertNotNull(attributes);
   assertFalse(attributes.isEmpty());
   for (Attribute attr : attributes) {
     assertTrue(allCodes.contains(attr.getCode()));
   }
   // category already has all attributes
   attributes = attributeService.findAvailableAttributes(AttributeGroupNames.CATEGORY, allCodes);
   assertNotNull(attributes);
   assertTrue(attributes.isEmpty());
   // get all except URI
   attributes =
       attributeService.findAvailableAttributes(
           AttributeGroupNames.CATEGORY, Arrays.asList("URI"));
   assertNotNull(attributes);
   assertFalse(attributes.isEmpty());
   assertEquals("CATEGORY_ITEMS_PER_PAGE", attributes.get(0).getCode());
   // get just URI
   attributes =
       attributeService.findAttributesByCodes(AttributeGroupNames.CATEGORY, Arrays.asList("URI"));
   assertNotNull(attributes);
   assertFalse(attributes.isEmpty());
   assertEquals("URI", attributes.get(0).getCode());
 }