/**
  * @depends testClassCreate
  * @param $ItemClass
  * @return \core_kernel_classes_Class
  */
 public function testSubClassCreate($ItemClass)
 {
     $subItemClassLabel = 'subItem class';
     $subItemClass = $this->itemsService->createSubClass($ItemClass, $subItemClassLabel);
     $this->assertIsA($subItemClass, 'core_kernel_classes_Class');
     $this->assertEquals($subItemClassLabel, $subItemClass->getLabel());
     return $subItemClass;
 }