@Test
 public void testAddWithIdentifier() {
   MappingProject mappingProject = new MappingProject("My first mapping project", owner);
   mappingProject.setIdentifier("mappingProjectID");
   try {
     mappingProjectRepositoryImpl.add(mappingProject);
   } catch (MolgenisDataException mde) {
     assertEquals(mde.getMessage(), "MappingProject already exists");
   }
 }
 @Test
 public void testUpdateUnknown() {
   mappingProject.setIdentifier("mappingProjectID");
   when(dataService.findOne(ENTITY_NAME, "mappingProjectID")).thenReturn(null);
   try {
     mappingProjectRepositoryImpl.update(mappingProject);
     fail("Expected exception");
   } catch (MolgenisDataException expected) {
     assertEquals(expected.getMessage(), "MappingProject does not exist");
   }
 }