code: def test_select_roi():
      # Test select_roi method
      mroi = make_subdomain()
      aux = np.random.randn(np.prod(shape))
      data = [aux[mroi.label == k] for k in range(8)]
      mroi.set_feature("data", data)
      mroi.set_roi_feature("data_mean", list(range(8)))
      mroi.select_roi([0])
      assert mroi.k == 1
      assert mroi.roi_features["id"] == [0]
      assert mroi.get_roi_feature("data_mean", 0) == 0
      mroi.select_roi([])
      assert mroi.k == 0
      assert list(mroi.roi_features) == ["id"]
      assert list(mroi.roi_features["id"]) == []
  
imports: from os.path import dirname
  from os.path import join
  import numpy
  from nibabel import Nifti1Image, load
  from numpy.testing import assert_almost_equal, assert_array_equal
  from nipy.io.nibcompat import get_affine
  from ..discrete_domain import domain_from_binary_array, grid_domain_from_image
  from ..hroi import HROI_as_discrete_domain_blobs
  from ..mroi import subdomain_from_array, subdomain_from_balls
label_desc: Use image node_id 5 for calling a global function with example usage: test_select_roi() without return types