code: def test_correct_center(self):
      cropper = RandCropByPosNegLabeld(
          keys="label", label_key="label", spatial_size=[3, 3]
      )
      cropper.set_random_state(0)
      test_image = {
          "label": np.asarray(
              [[[1, 0, 0, 1], [0, 0, 0, 0], [0, 0, 0, 0], [1, 0, 0, 1]]]
          )
      }
      result = cropper(test_image)
      np.testing.assert_allclose(
          result[0]["label"],
          np.asarray([[[0, 0, 1], [0, 0, 0], [0, 0, 0]]]),
      )
  
file_path: MONAI/tests/test_rand_crop_by_pos_neg_labeld.py
imports: from __future__ import annotations
  import unittest
  from copy import deepcopy
  import numpy
  from parameterized import parameterized
  from monai.data.meta_tensor import MetaTensor
  from monai.transforms import RandCropByPosNegLabeld
  from monai.transforms.lazy.functional import apply_pending
  from tests.utils import TEST_NDARRAYS_ALL, assert_allclose
label_desc: Use image node_id 3 for calling the TestRandCropByPosNegLabeld obj's underlying member method code with example usage: obj.test_correct_center() without return types