public <E extends Entity> E findClosestEntity(EntityType<E> entityType, int i, int j, int k, double d) {
  List<E> list = this.findEntities(entityType, i, j, k, d);
  if (list.isEmpty()) {
    throw this.assertionException("test.error.expected_entity_at_pos", entityType.getDescription(), i, j, k);
  } else if (list.size() > 1) {
    throw this.assertionException("test.error.too_many_entities", entityType.toShortString(), i, j, k, list.size());
  } else {
    Vec3 vec3 = this.absoluteVec(new Vec3((double)i, (double)j, (double)k));
    list.sort((entity, entity2) -> {
      double dxx = entity.position().distanceTo(vec3);
      double e = entity2.position().distanceTo(vec3);
      return Double.compare(dxx, e);
    });
    return (E)list.get(0);
  }
}