code: def test_error_messages_connected_label_regions(labels_img):
      with pytest.raises(
          ValueError,
          match="Expected 'min_size' to be specified as integer.",
      ):
          connected_label_regions(labels_img=labels_img, min_size="a")
      with pytest.raises(
          ValueError,
          match="'connect_diag' must be specified as True or False.",
      ):
          connected_label_regions(
              labels_img=labels_img, connect_diag=None
          )
  
imports: import numpy
  import pytest
  from nibabel import Nifti1Image
  from scipy.ndimage import label
  from nilearn._utils.data_gen import generate_labeled_regions, generate_maps
  from nilearn._utils.exceptions import DimensionError
  from nilearn.conftest import _affine_eye, _img_4d_zeros, _shape_3d_default
  from nilearn.image import get_data
  from nilearn.regions import RegionExtractor, connected_label_regions, connected_regions
  from nilearn.regions.region_extractor import _remove_small_regions, _threshold_maps_ratio
label_desc: Use image node_id 21 for calling a global function with example usage: test_error_messages_connected_label_regions(labels_img) without return types