public function entityProvider()
 {
     $entities = array_filter(TestChanges::getEntities(), function (EntityDocument $entity) {
         return $entity instanceof Item;
     });
     $cases = array_map(function (Item $item) {
         return array($item);
     }, $entities);
     return $cases;
 }
 public function entityProvider()
 {
     $entityClass = $this->getEntityClass();
     $entities = array_filter(TestChanges::getEntities(), function (EntityDocument $entity) use($entityClass) {
         return is_a($entity, $entityClass);
     });
     $cases = array_map(function (EntityDocument $entity) {
         return array($entity);
     }, $entities);
     return $cases;
 }